Answer:
10.1 % Carbon, 0.8 % Hydrogen and 89.1 % Chlorine.
Explanation:
The total mass of the compound is 5.34 + 0.42 + 47.08 = 52.84 g.
The percentage of carbon is: [tex]\frac{5.34}{52.84}[/tex] × 100 = 10.1 %
The percentage of hydrogen is: [tex]\frac{0.42}{52.84}[/tex] × 100 = 0.8 %
The percentage if chlorine is: [tex]\frac{47.08}{52.84}[/tex] × 100 = 89.1 %
The percent composition of the compound is approximately 10.10% carbon, 0.797% hydrogen, and 89.10% chlorine.
To determine the percent composition of the compound, one must calculate the mass percentage of each element present in the sample. The mass percentage of an element is calculated by dividing the mass of that element by the total mass of the compound and then multiplying by 100%.
First, we need to find the total mass of the compound by summing the mass of all the elements present:
Total mass = Mass of carbon + Mass of hydrogen + Mass of chlorine
Total mass = 5.34 g + 0.42 g + 47.08 g
Total mass = 52.84 g
Now, we can calculate the mass percentage of each element:
Percent composition of carbon:
[tex]\( \frac{\text{Mass of carbon}}{\text{Total mass}} \times 100\% = \frac{5.34 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 10.10\% \)[/tex]
Percent composition of hydrogen:
[tex]\( \frac{\text{Mass of hydrogen}}{\text{Total mass}} \times 100\% = \frac{0.42 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 0.797\% \)[/tex]
Percent composition of chlorine:
[tex]\( \frac{\text{Mass of chlorine}}{\text{Total mass}} \times 100\% = \frac{47.08 \text{ g}}{52.84 \text{ g}} \times 100\% \approx 89.10\% \)[/tex]
Therefore, the percent composition of the compound is approximately 10.10% carbon, 0.797% hydrogen, and 89.10% chlorine.
At which point was neutralization complete for the acid that is being titrated below?
A
B
C
D
Answer:
D.
Explanation:
From the shown titration curve, It is a titration curve for a diprotic acid (H₂A).The neutralization of the first proton is at point A.The neutralization of the second proton (complete neutralization) is at point D.So, the right choice is: D.
D on e2020
extra words to get to 20 letters
Balance and state of the reactions are precipitation, acid/base, or oxidation/reduction reactions.
A) Fe + O2 -> Fe2O3
B) Br2 + Fe(NO3)2 + KNO3 -> KBr + Fe(NO3)3
C) Ba(OH)2 + HNO3 -> H2O + Ba(NO3)2
D) NaF + Mg(NO3)2 -> MgF + NaNO3
The answers are in the photo.
Which does the earths energy budget give us an idea about ? Select all that apply.
How much energy is reflected from earth back into space
How much energy is used by humans
How much energy is used by animals and nature
How much solar energy comes into earths atmosphere
Answer:
first one: how much is reflected
Reason? google search :)
Answer:
How much energy is reflected from earth back into space
Explanation:
This energy exchange is known as space-atmosphere-earth energy balance. To explain it, we will give the short-wave incident solar radiation that reaches our atmosphere a value of 100 units.
Stratospheric ozone absorbs and in turn emits 3 units; Water vapor, carbon dioxide and clouds produce an absorption of 18 units. The clouds, in turn, reflect radiation into space worth 24 units, and the rest of atmospheric particles reflect another 7.
The energy that reaches the ground, either directly or indirectly, is 47 units; Of which, the different components of the earth's surface reflect an average of 4.
The surface of the Earth transforms solar energy into long-wave radiation - heating - which, when emitted into space, at a temperature of 15 degrees Celsius, would correspond to 114 units; Of which, 109 are absorbed by water vapor, carbon dioxide and clouds, thus heating the lower atmospheric layers.
The British gold sovereign coin is an alloy of gold and copper having a total mass of 7.988 g, and is 22-karat gold. (a) Find the mass of gold in the sovereign in kilograms using the fact that the number of karats = 24 (mass of gold)/(total mass). kg (b) Calculate the volumes of gold and copper, respectively, used to manufacture the coin. volume of gold Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m3 volume of copper Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m3 (c) Calculate the density of the British sovereign coin. kg/m3
Answer:
(a) Mass of gold = 0.0073223 kg.
(b) V of gold 3.79 x 10⁻⁷ m³ & ∴ V of copper = 7.438 x 10⁻⁸ m³.
(c) The density of the British sovereign coin 17,620 kg/m³.
Explanation:
(a) Find the mass of gold in the sovereign in kilograms using the fact that the number of karats = 24 (mass of gold)/(total mass).
∵ the number of karats = 24 (mass of gold)/(total mass)
the number of karats = 22-karat gold,
mass of gold = ??? g,
total mass = 7.988 g.
∴ mass of gold = (the number of karats)(total mass)/24 = (22)(7.988 g)/(24) = 7.3223 g = 0.0073223 kg.
(b) Calculate the volumes of gold and copper, respectively.
∵ Mass of coin = 7.988 g.
∵ mass of gold = 7.3223 g.
∴ mass of Cu = Mass of coin - mass of gold = 7.988 g - 7.3223 g = 0.6657 g = 0.6657 x 10⁻³ kg.
To find the volume of Copper and gold, we can use the relation:V = m/d.
where, V is the volume of the material,
m is the mass of the material,
d is the density of the material.
For gold:Density of gold = 19,320 kg/m³, mass of gold = 0.0073223 kg.
∴ V of gold = m/d = (0.0073223 kg)/(19,320 kg/m³) = 3.79 x 10⁻⁷ m³.
For copper:
Density of copper = 8,950 kg/m³, mass of copper = 0.6657 x 10⁻³ kg.
∴ V of copper = m/d = (0.6657 x 10⁻³ kg)/(8,950 kg/m³) = 7.438 x 10⁻⁸ m³.
(c) Calculate the density of the British sovereign coin. kg/m³.
To find the density of the British sovereign coin, we can use the relation:d = m/V.
mass of the British sovereign coin = 7.988 g = 0.007988 kg.
Volume of the British sovereign coin = V of gold + V of copper = (3.79 x 10⁻⁷ m³) + (7.438 x 10⁻⁸ m³) = 4.534 x 10⁻⁷ m³.
∴ Density of the British sovereign coin = m/V = (0.007988 kg)/(4.534 x 10⁻⁷ m³) = 17,620 kg/m³.
Based on the relationships between mass, volume and density;
mass of gold in the sovereign is 0.0073223 kgthe volume of gold is 3.79 x 10⁻⁷ m³ while the volume of copper is 7.438 x 10⁻⁸ m³the density of the British sovereign coin 17,620 kg/m³.What is the the relationships between mass, volume and density?The mass, volume and density of a substance are related by the formula given below:
Density = mass/volumea) Using the fact that the number of karats = 24 (mass of gold)/(total mass). kg;
the number of karats = 24 (mass of gold)/(total mass)
the number of karats = 22-karat gold,
total mass = 7.988 g.
mass of gold = (the number of karats)(total mass)/24mass of gold = (22)(7.988 g)/(24) = 7.3223 g
mass of gold = 0.0073223 kg.
(b) The volume of gold and copper are calculated thus:
Mass of coin = 7.988 g.mass of gold = 7.3223 g.mass of copper = Mass of coin - mass of gold
mass of copper = 7.988 g - 7.3223 g = 0.6657 g
mass of copper = 0.6657 x 10⁻³ kg.
From the formula above:
Volume = mass /densityThus;
Density of gold = 19,320 kg/m³, mass of gold = 0.0073223 kg.
Volume of gold = 0.0073223 kg/19,320 kg/m³
Volume of gold = 3.79 x 10⁻⁷ m³
Also,
Density of copper = 8,950 kg/m³, mass of copper = 0.6657 x 10⁻³ kg.
volume of copper = (0.6657 x 10⁻³ kg)/(8,950 kg/m³)
Volume of copper = 7.438 x 10⁻⁸ m³.
(c) the density of the British sovereign coin is then calculated using the formula:
density = mass/volumemass of the British sovereign coin = 7.988 g = 0.007988 kg.
Volume of the British sovereign coin = volume of gold + volume of copper = (3.79 x 10⁻⁷ m³) + (7.438 x 10⁻⁸ m³) = 4.534 x 10⁻⁷ m³.
Then;
Density of the British sovereign coin = (0.007988 kg)/(4.534 x 10⁻⁷ m³)
Density of the British sovereign coin = 17,620 kg/m³.
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How is plant photosynthesis and human respiration a example of zero waste world
Photosynthesis will produce oxygen gas that will be taken up by humans for respiration. Respiration will produce carbon dioxide that will be taken up by plants for photosynthesis. So both waste products will be recycled and reused so therefore an example of zero waste world
Answer:
On the one hand the human being when breathing consume oxygen and returns carbon dioxide to the environment, which for human respiration would be waste, instead the absorbent plant said carbon dioxide to transform it into nutrients through photosynthesis and as a danger releases oxygen, the which as we said before is used by the human being in his breathing. This concludes a sustainability cycle with zero waste.
Explanation:
Photosynthesis is a process that develops in two stages:
Light reactions: it is a light-dependent process (clear stage), it requires light energy to manufacture ATP and NADPH reduced energy carrier molecules, to be used in the second stage.
Calvin-Benson cycle: it is the independent stage of light (dark stage), the products of the first stage plus CO2 are used to form the C-C bonds of carbohydrates. Dark stage reactions usually occur in the dark if energy transporters from the light stage are present. Recent evidence suggests that the most important enzyme of the dark stage is indirectly stimulated by light, if so the term would not be correct to call it "dark stage". The light stage occurs in the grana and the dark one in the stroma of the chloroplasts.
Human breathing
In breathing, a vital process for life, the oxygen from the inhaled air enters the blood, and carbon dioxide - a waste gas from the metabolism of nutrients - is exhaled into the atmosphere.
The exchange of these gases takes place when the air reaches the pulmonary alveoli. These small sacs are surrounded by blood capillaries. The air diffuses through these cells to reach the interior of the blood capillaries, which transport oxygen-rich air to the heart to be distributed throughout the body. At the same time, in the alveoli the gaseous carbon dioxide diffuses from the blood into the lung and is exhaled.
Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. It is often called the universal solvent because it dissolves more substances than any other liquid. The reason for this is best explain by which of these? A) Water is polar with a positive and negative side. B) Water is the most abundant liquid on earth. C) Water bonds with most chemicals. D) Water expands as it freezes.
Answer:
Explanation:
In this case the answer would be
Water is a polar molecule with positive and negative side
Now since these negative and positives are present in the water molecule . In easy terms when a substance reacts with water .the negative part of water ( oxygen ) reacts with the positive part of the substance and the positive part of the water ( hydrogen) reacts with negative part of the substance .if you look at the reason . Water is held up by one of the strongest attraction forces available .since most substances have weaker attraction forces between them ,therefore water can easily overcome them with its forces. Thus giving it the ability to dissolve a variety of substances
Answer:
d
Explanation:
edge 2020
In the past, investigators would look at which two types of cues when trying to determine if someone was lying?
Biased and unbiased
Verbal and non-verbal
Quiet and loud
Simple and complex
Answer : Verbal and non-verbal communication wad used by Investigators in the past when trying to determine if someone was lying.
Explanation: In the Verbal communication information is transferred from one person to other by speaking.
Non-verbal communication includes Facial expressions , eye contact , body language, eyes blinking etc.
If someone is lying he or she will easily dermined by applying above things.
A mixture of nitrogen and hydrogen gases, at a temperature of 500
K, was put into an evacuated
vessel of volume 6.0
dm3. The vessel was then sealed.
N2(g) + 3H2(g) 2NH3(g)
The mixture was allowed to reach equilibrium. It was found that 7.2
mol of N2 and 12.0
mol of H2 were present in the equilibrium mixture. The value of the equilibrium constant, Kc, for this equilibrium is 6.0 × 10–2 at 500
K.
What is the concentration of ammonia present in the equilibrium mixture at 500
K?
answer is B, I don't know why. Please help
Answer:
0.7589 mol/L ≅ 0.76 mol/L.
Explanation:
For the equilibrium mixture:N₂(g) + 3H₂(g) ⇄ 2NH₃(g),
Kc = [NH₃]²/[N₂][H₂]³
At 500 K, V = 6.0 dm³ = 6.0 L:
Kc = 6.0 x 10⁻²,
[N₂] = (7.2 mol)/(6.0 L) = 1.2 mol/L, [H₂] = (12.0 mol)/(6.0 L) = 2.0 mol/L.
∴ [NH₃]² = (Kc)[N₂][H₂]³ = (6.0 x 10⁻²)(1.2 mol/L)(2.0 mol/L)³ = 0.576.
∴ [NH₃] = √(0.576) = 0.7589 mol/L ≅ 0.76 mol/L.
Can anybody check my answer?
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A given mass of air has a volume of 10.00L at 100kPa. What volume will it occupy at 50kPa if the temperature does not change?
Five moles of a gas occupies 20L of space with a pressure of 101.3kPa. What is the temperature of the gas?
Answer:
[tex]\boxed{\text{25. 20 L; 26. 49 K}}[/tex]
Explanation:
25. Boyle's Law
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rcrrcl}p_{1}& =& \text{100 kPa}\qquad & V_{1} &= & \text{10.00 L} \\p_{2}& =& \text{50 kPa}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}100 \times 10.00 & =& 50V_{2}\\1000 & = & 50V_{2}\\V_{2} & = &\textbf{20 L}\\\end{array}\\\text{The new volume will be } \boxed{\textbf{20 L}}[/tex]
26. Ideal Gas Law
We have p, V and n, so we can use the Ideal Gas Law to calculate the volume.
pV = nRT
Data:
p = 101.3 kPa
V = 20 L
n = 5 mol
R = 8.314 kPa·L·K⁻¹mol⁻¹
Calculation:
101.3 × 20 = 5 × 8.314 × T
2026 = 41.57T
[tex]T = \dfrac{2026}{41.57} = \textbf{49 K}\\\\\text{The Kelvin temperature is }\boxed{\textbf{49 K}}[/tex]
What characteristics are shared by all alkali metals and alkaline earth metals?
Alkali metals and alkaline earth metals share similar chemical properties. Alkali metals have a single valence electron which they easily lose, while alkaline earth metals have two valence electrons. Alkali metals are more reactive than alkaline earth metals.
Explanation:Alkali metals and alkaline earth metals share several characteristics. Both alkali metals (such as lithium, sodium, and potassium) and alkaline earth metals (such as calcium, strontium, and barium) have similar chemical properties. They are shiny, good conductors of heat and electricity, and have similar reactivity. However, alkali metals are more reactive than alkaline earth metals. Alkali metals have a single valence electron in their outermost shell which they easily lose, while alkaline earth metals have two valence electrons.
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Every day, about 1 4 0 , 0 0 0 , 0 0 0 140,000,000140, comma, 000, comma, 000 plastic water bottles are bought in the United States. Each bottle is about 0 . 2 5 0.250, point, 25 meters long, and the equator of the Earth is about 4 0 , 0 0 0 , 0 0 0 40,000,00040, comma, 000, comma, 000 meters around. How many times can the Earth's equator be circled by a line of plastic bottles used in the United States every day?
Answer:
0.875 time.
Explanation:
The length of plastic water bottles are bought in the United States every day = (the no. of plastic water bottles are bought every day)(length of each bottle) = (140.0 million bottle)(0.25 m) = 35.0 million meter.
The length of the equator of the earth = 40.0 million meter.
∴ The times can the Earth's equator be circled by a line of plastic bottles used in the United States every day = (The length of plastic water bottles are bought in the United States every day)/(The length of the equator of the earth) = (35.0 million meter)/(40.0 million meter) = 0.875 times.
Which of the following best represents the reaction between sulfuric acid and calcium hydroxide? f H2SO4 + 2Ca(OH)2 → 2CaSO4 + 3H2O g H2SO4 + Ca(OH)2 → CaSO4 + 2H2O h HSO4 + CaOH → CaSO4 + H2O j H2SO4 + Ca(OH)2 → CaSO4 + H2O
Answer:
g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.
Explanation:
Sulfuric acid is represented as H₂SO₄ and calcium hydroxide is represented as Ca(OH)₂.
To balance a chemical reaction. we should apply the law of conservation of mass that the no. of different atoms in both sides (reactants and products).The only choice that represent the reactants correctly and apply the law of conversation of mass is:g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.
f. H₂SO₄ + 2Ca(OH)₂ → 2CaSO₄ + 3H₂O
is not correct that the no. of S, and O is not equal in both reaction sides.
S in reactants (1) while in products (2).
O in reactants (8) while in products (11).
h. HSO₄ + CaOH → CaSO₄ + H₂O
The reactants is represented in a wrong way.
j. H₂SO₄+ Ca(OH)₂ → CaSO₄ + H₂O
is not correct that the no. of H and O is not equal in both reaction sides.
H in reactants (4) while in products (2).
O in reactants (6) while in products (5).
So, the right choice is: g. H₂SO₄ + Ca(OH)₂ → CaSO₄ + 2H₂O.
The correct balanced equation for the reaction between sulfuric acid and calcium hydroxide is: H₂SO₄ + 2Ca(OH)₂ → CaSO₄ + 2H₂O
This equation represents a neutralization reaction between an acid (sulfuric acid) and a base (calcium hydroxide). In this reaction, sulfuric acid reacts with calcium hydroxide to produce calcium sulfate and water.
The stoichiometric coefficients in front of each compound indicate the balanced ratio of reactants and products.
According to the equation, for every 1 molecule of sulfuric acid, 2 molecules of calcium hydroxide. This is because sulfuric acid is a diacid, meaning it can donate two hydrogen ions (H+) per molecule.
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Which of these, if dissolved in 1.0 l of pure water, would produce a buffer solution? which of these, if dissolved in 1.0 l of pure water, would produce a buffer solution? 0.1 mol nah2po4 + 0.1 mol na2hpo4 0.1 mol h3o+ + 0.1 mol cl- 0.1 mol hcl + 0.1 mol naoh 0.1 mol h3o+ + 0.1 oh- 0.1 mol nacl + 0.1 mol kcl?
Answer:
(0.1 mol NaH₂PO₄ + 0.1 mol Na₂HPO₄)Explanation:
A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or weak base and its conjugate acid.
Also, a buffer solution is a solution which resists changes in pH when acid or alkali is added to it.
(0.1 mol NaH₂PO₄ + 0.1 mol Na₂HPO₄) when dissolved in 1 L H₂O will produce a buffer because NaH₂PO₄ is considered as weak acid while Na₂HPO₄ is its conjugate base. 2.(0.1 mol H₃O⁺ + 0.1 mol Cl⁻) is not a mixture of a weak acid and its conjugate base, or weak base and its conjugate acid.(0.1 mol HCl + 0.1 mol NaoH) HCL is a strong acid and NaOH is a strong base so it will not form a buffer when dissolved in water. (0.1 mol H₃O⁺ + 0.1 OH⁻) is not a mixture of a weak acid and its conjugate base, or weak base and its conjugate acid(0.1 mol NaCl+ 0.1 mol KCl) NaCL and KCL are salts so it will not form a buffer when dissolved in water.So the right choice is
(0.1 mol NaH₂PO₄ + 0.1 mol Na₂HPO₄)A combination of 0.1 mol NaH2PO4 and 0.1 mol Na2HPO4 would produce a buffer solution.
Explanation:A buffer solution is a solution that resists changes in pH when small amounts of acid or base are added. To form a buffer solution, we need a weak acid and its conjugate base (or a weak base and its conjugate acid) in roughly equal amounts.
Out of the given options, the combination of 0.1 mol NaH2PO4 and 0.1 mol Na2HPO4 would produce a buffer solution. NaH2PO4 is a weak acid and Na2HPO4 is its conjugate base. Together, they can maintain the pH of the solution.
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What is the mass of 3.20×10^23 fotmula units of fe2o3
To determine the mass of SO₃ that can react with 3.59 mol of Fe₂O₃, we use the molar ratio from the balanced equation and the molar mass of SO₃ to find that 862 g of SO₃ are needed.
To find out how many grams of SO₃ can react with 3.59 mol of Fe₂O₃, we follow a two-step mole-mass calculation process. The balanced chemical equation Fe₂O₃ +3SO₃
ightarrow Fe₂(SO₄)₃ provides us with the molar ratio needed for this calculation. For every mole of Fe₂O₃, three moles of SO₃ are required. So, we multiply the number of moles of Fe₂O₃ (3.59 mol) by three to find the moles of SO₃needed.
Once we have the number of moles of SO₃, we then use the molar mass of SO₃ to find the mass. The molar mass of SO₃ is 80.066 g/mol. After calculating the number of moles of SO3, we can then multiply by this molar mass to get the final weight of SO₃ that can react with 3.59 mol of Fe₂O₃. Applying this method, we calculate that 862 g of SO₃ will react with 3.59 mol of Fe₂O₃.
In the reaction of magnesium with oxygen, explain which atom is the reducing agent.
Show ALL steps.
Answer:
Mg.
Explanation:
The oxidation-reduction reaction contains a reductant and an oxidant (oxidizing agent).An oxidizing agent, or oxidant, gains electrons and is reduced in a chemical reaction. Also known as the electron acceptor, the oxidizing agent is normally in one of its higher possible oxidation states because it will gain electrons and be reduced.A reducing agent (also called a reductant or reducer) is an element (such as calcium) or compound that loses (or "donates") an electron to another chemical species in a redox chemical reaction.For the reaction:Mg + 1/2O₂ → MgO.
Mg is oxidized to Mg²⁺ in (MgO) (loses 2 electrons). "reducing agent".
O is reduced to O²⁻ in (MgO) (gains 2 electrons). "oxidizing agent".
At standard temperature and pressure, 1 mole of gas has what volume? A. 2.4 liters B. 22.4 liters C. 42.4 liters D. 76.6 liters
Answer: B.22.4 liters
Explanation:
When we attribute to a certain fixed mass of a given gas a fixed number of molecules. Avogadro considered that the mass of 36g of oxygen at any temperature and pressure would have a fixed number of molecules to which he called 1 mol of molecules. So by definition 1 mole of molecules would have a number of molecules equal to that present in 36 g of oxygen. The occupied volume by one mole of molecules at a given temperature and pressure is called molar volume and consists in 22,4 Liters. The molar volume matches the Avogadro Hypothesis (created in 1811 by Amedeo Avogadro), where equal volumes of different gases, at the same temperature and pressure, have even number of moles.
At standard temperature and pressure (STP), 1 mole of any gas will occupy a volume of 22.4 liters. This is a universal truth for all ideal gases.
Explanation:The volume of 1 mole of any gas at standard temperature and pressure (STP) is defined by Avogadro's law. According to this law, the volume of 1 mole of gas at STP is 22.4 liters. Therefore, the correct answer to your question is B. 22.4 liters. This applies to all ideal gases, assuming that temperature is 0°C and pressure is 1 atmosphere.
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How many moles of co2 are there in a 50.0 dm3 sample of the gas at a pressure of 100.0 kpa and a temperature of 50°c?
Answer:
1.86 moles
Explanation:
The equation you need to use is PV = nRT, where n is the value you are searching for.
P = 100.0 kPA
V = 50.0 dm^3
n = ?
R = 8.314
T = 50 celsius converted to kelvin (323 k)
Multiply the pressure times the volume (100*50) and divide it by the constant (R) by the temperature (8.314*323).
(100*50) / (8.314*323) = 5000 / 2685.422 = 1.86 moles
There are 1.19 moles of CO2 in the given sample.
To determine the number of moles of CO2 in the sample, we can use the ideal gas law, which is given by:
[tex]\[ PV = nRT \][/tex]
where:
- [tex]P[/tex] is the pressure of the gas,
- [tex]V[/tex] is the volume of the gas,
- [tex]n[/tex] is the number of moles of the gas,
- [tex]R[/tex] is the ideal gas constant, and
- [tex]T[/tex] is the temperature of the gas in Kelvin.
First, we need to convert the temperature from degrees Celsius to Kelvin:
[tex]\[ T(K) = T(°C) + 273.15 \][/tex]
[tex]\[ T(K) = 50°C + 273.15 = 323.15 K \][/tex]
Next, we need to ensure that the volume is in cubic meters [tex](m^3)[/tex] since the standard units for the ideal gas constant [tex]R[/tex] are [tex]J/(mol*K)[/tex]when pressure is in pascals [tex]Pa[/tex] and volume is in cubic meters. Note that 1 [tex]dm^3[/tex] is equivalent to 0.001 m³:
[tex]\[ V = 50.0 \text{ dm}^3 \times \frac{0.001 \text{ m}^3}{1 \text{ dm}^3} = 0.0500 \text{ m}^3 \][/tex]
Now we can plug in the values into the ideal gas law equation:
[tex]\[ n = \frac{PV}{RT} \][/tex]
[tex]\[ n = \frac{(100.0 \text{ kPa} \times \frac{1000 \text{ Pa}}{1 \text{ kPa}})(0.0500 \text{ m}^3)}{(8.314 \text{ J/(mol·K)})(323.15 \text{ K})} \][/tex]
[tex]\[ n = \frac{(100,000 \text{ Pa})(0.0500 \text{ m}^3)}{(8.314 \text{ J/(mol·K)})(323.15 \text{ K})} \][/tex]
[tex]\[ n = \frac{5000 \text{ J}}{2684.8695 \text{ J/(mol)}} \][/tex]
[tex]\[ n \approx 1.19 \text{ moles} \][/tex].
Therefore, there are approximately 1.19 moles of CO2 in the 50.0 dm³ sample at a pressure of 100.0 kPa and a temperature of 50°C.
Question 7(Multiple Choice Worth 4 points)
(08.05 MC)
What is the pH of a solution with a 3.8 × 10−4 M hydronium ion concentration?
3.4
3.8
11
12
Answer:
The pH of this solution is 3.4.
Explanation:
Consider the definition of the pH of a solution:
[tex]\displaystyle \rm pH = \log{\frac{1}{[H_{3}O^{+}]}} = - \log{[H_3O}^{+}]}[/tex],
where
[tex]\rm [H_3O}^{+}][/tex] is the hydronium ion concentration of the solution in moles per liter. Note that some textbooks write [tex]\rm [H_3O}^{+}][/tex] as [tex]\rm H^{+}[/tex].The unit "M" here is the same as moles per liter.
On a scientific calculator, evaluate
[tex]\rm -\log{(3.8\times 10^{-4})}[/tex]
to find the pH of this solution.
[tex]\rm pH = -\log{(3.8\times 10^{-4})} \approx 3.4[/tex].
The pH of this solution is approximately 3.4.
Why does grinding solid crystals increase the rate of dissolving for a solid solute in water? smaller crystals are more polar. smaller crystals are more nonpolar. smaller crystals have more energy. smaller crystals have more surface area. none of the above?
Answer:
The answer is...
Explanation:
Smaller crystals have more surface area.
By what factor does the gas temperature change if the volume is doubled and the pressure is tripled?
Answer:
If the volume is doubled and the pressure is tripled, the temperature changes by a factor of 6.Explanation:
Since, for ideal gases the temperature is in direct relation to the volume and the pressure, you can predict that if the volume is doubled and the pressure is tripled the effect on the temperature will be 3 × 2 = 6 times.
You can prove it using the combined law of gases:
P₁ V₁ /T₁ = P₂ V₂ / T₂Where the letters P denote absolute pressures, the letters T denote temperature measured in absolute scale, and the letters V denote volume.
The changes given may be written it this way:
V₂ = 2 × V₁ = 2V₁P₂ = 3 × P₁ = 3P₁Then, you can write T₂ in terms of the other variables:
T₂ = (P₂ V₂ T₂) / (P₁ V₁) = 3P₁ 2V₁ T₂ / (P₁V₁)Cancel the common factors P₁ and V₁
T₂ = 6 T₁Which proves that the final temperature is 6 times the initial temperature.
By tripling the pressure and doubling the volume, the gas temperature changes by a factor of 6 according to the combined gas law.
To determine by what factor the gas temperature changes if the volume is doubled and the pressure is tripled, we can use the combined gas law, which is a combination of Boyle's, Charles's, and Gay-Lussac's laws. The combined gas law states that for a given amount of gas, the ratio of the product of pressure (P) and volume (V) to the temperature (T) is constant, or:
(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂
Assuming the initial conditions are P₁, V₁, and T₁, and after the changes they are P₂ = 3 * P₁, V₂ = 2 * V₁, and T₂, we can rearrange the equation to solve for T2/T1:
(3 * P₁ * 2 * V₁) / T₂ = (P₁ * V₁) / T₁
(6 * P₁ * V₁) / T₂ = (P₁ * V₁)/ T₁
T₂ / T₁ = 6 * (P₁ * V₁) / (P₁ * V₁)
T₂ / T₁ = 6
So by tripling the pressure and doubling the volume, the temperature of the gas increases by a factor of 6. This result agrees with our understanding of the behavior of gases when subjected to changes in temperature, volume, and pressure.
In general, what is the relationship between temperature and the reaction rate of a chemical reaction? A. When temperature increases, the number and energy of collisions between particles increases, which increases the rate of the reaction. B. When temperature increases, the activation energy required for the reaction increases, which decreases the rate of the reaction. C. When temperature increases, the reaction becomes more endothermic, which increases the rate of the reaction. D. When temperature increases, the reaction becomes more exothermic, which decreases the rate of the reaction.
Answer:
A. When temperature increases, the number and energy of collisions between particles increases, which increases the rate of the reaction.
Explanation:
The reaction rate measures the speed with which a reaction proceeds. Based on the collision theory of reaction rates, the rate of a given reaction depends on the number of collisions per time and how successful or effective the collisions are.
Reaction rate in view of the collision theory is very related to concentration and temperature. Both properties are directly proportional to the rate of a reaction.
As temperature increase, the rate of the reaction increases due to the number of effective collisions and the energy of between colliding particles.
The relationship between the temperature and the reaction should be option A.
Relationship between the temperature and the reaction:The reaction rate represents the speed. Depend on the collision theory of reaction rates, the rate of a given reaction based on the number of collisions per time. Since temperature increase, the rate of the reaction increases because of the number of effective collisions.
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What has the higher specific heat, a metal spoon or a wooden spoon?
How can you tell?
Answer:
metal spoon
Explanation:
Metals are good conductors of heat and electricity and they have high boiling and melting points
Final answer:
A wooden spoon has a higher specific heat than a metal spoon because it requires more energy to change its temperature. Metals conduct heat better and thus heat up and cool down more quickly compared to wood, indicating a lower specific heat for the metal.
Explanation:
The specific heat of a substance is a measure of how much energy is required to raise the temperature of 1 gram of that substance by 1°C. A wooden spoon would typically have a higher specific heat than a metal spoon. This is because metals generally conduct heat better and require less energy to change their temperature compared to wood. This property is why a metal spoon heats up quickly when placed in a hot environment, feeling much warmer to the touch compared to a wooden spoon in the same conditions.
To understand which material has the higher specific heat, we can refer to the principle that objects with greater specific heat require more energy to change their temperature. When comparing a metal to wood, the metal's temperature tends to change more quickly due to its lower specific heat, thus it heats up and cools down faster than wood.
What is the strongest interparticle force in a sample of solid mgcl2?
Answer: The strongest inter particle force in [tex]MgCl_2[/tex] is electrostatic force of attraction.
Explanation:
Magnesium chloride is an ionic compound which is formed by the combination of magnesium ions and chloride ions.
Ionic compounds are defined as the compounds which are formed by the complete transfer of electrons from one atom to another atom.
In these compounds, oppositely charged ions are attracted towards each other to form a compound.
The attraction between oppositely charged species is very strong and is known as electrostatic force of attraction.
Hence, the strongest inter particle force in [tex]MgCl_2[/tex] is electrostatic force of attraction.
Determine the Balmer formula n and m values for the wavelength 656.5 nm. Possible Choices: m= 1 n= 2 m= 2 n= 3 m= 3 n= 4 m= 2 n= 5 Part B Determine the Balmer formula n and m values for the wavelength 486.3 nm. Possible Choices: m= 1 n=2 m= 2 n=3 m= 1 n=4 m= 2 n=4 Part C Determine the Balmer formula n and m values for the wavelength 434.2 nm. Possible Choices: m= 1 n= 4 m= 2 n= 4 m= 3 n= 4 m= 2 n= 5 Part D Determine the Balmer formula n and m values for the wavelength 410.3 nm. Possible Choices: m= 2 n= 4 m= 2 n= 5 m= 3 n= 4 m= 2 n= 6
Answer:
[tex]\boxed{\text{A. } m = 2, n = 3; \text{B. } m = 2, n = 4; \text{C. } m = 2, n = 5; \text{D. } m = 2, n = 6}[/tex]
Explanation:
The Balmer equation is
[tex]\lambda = B\left(\dfrac{n^{2}}{n^{2} -m^{2}}\right)[/tex]
where B = 364.5 nm and m = 2
Thus, the Balmer equation reduces to
[tex]\lambda = 364.5\left(\dfrac{n^{2}}{n^{2} - 4}\right)[/tex]
We will be doing four separate calculations for n, so it will be convenient to solve the equation for n.
[tex]\lambda (n^{2} -4) = 364.5n^{2}\\\\\lambda n^{2} -4\lambda = 364.5n^{2}\\\\\lambda n^{2}- 364.5n^{2} = 4\lambda \\\\ n^{2}(\lambda - 364.5) = 4\lambda \\\\ n^{2}= \dfrac{4\lambda}{\lambda - 364.5}\\\\ n= \sqrt{\dfrac{4\lambda}{\lambda - 364.5}}[/tex]
A. λ = 656.5 nm
[tex]n= \sqrt{\dfrac{4 \times 656.5}{656.5 - 364.5}} = \sqrt{\dfrac{2626}{292}} =\sqrt{8.993} = 2.999 \approx \boxed{\mathbf{3}}[/tex]
B. λ = 486.3 nm
[tex]n= \sqrt{\dfrac{4 \times 486.3}{486.3 - 364.5}} = \sqrt{\dfrac{1945}{121.8}} =\sqrt{15.97} = 3.996 \approx \boxed{\mathbf{4}}[/tex]
C. λ = 434.2 nm
[tex]n= \sqrt{\dfrac{4 \times 434.2}{434.2 - 364.5}} = \sqrt{\dfrac{1737}{69.7}} =\sqrt{24.9} = 4.99 \approx \boxed{\mathbf{5}}[/tex]
D. λ = 410.3 nm
[tex]n= \sqrt{\dfrac{4 \times 410.3}{410.3 - 364.5}} = \sqrt{\dfrac{1641}{45.8}} =\sqrt{35.8} = 5.99 \approx \boxed{\mathbf{6}}[/tex]
What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl? L
Answer:
0.47dm³
Explanation
Given parameters :
Molarity of NaCl = 6.67M
Number of moles = 3.12mol
Volume of NaCl =?
Volume of NaCl = number of moles/Molarity
Volume of NaCl = 3.12mol/6.67M
Volume of NaCl = 0.47dm³
Answer:
0.468
Explanation: got it right on edge
How much energy is absorbed as heat by 20. G of gold when it is heated from 25ºc to 35ºc? The specific heat of gold is 0.13 j/g·ºc.
Answer:
26. JExplanation:
1) Data:
a) m = 20. g
b) ΔT = 35°C - 25°C
c) Cs = 0.13 J / g°C
2) Formula:
Heat absorbed, Q = m × Cs × ΔT3) Solution:
Q = 20. g × (35°C - 20°C) × 0.13 J/ g°C = 20. g × 10°C × 0.13 J/g°C = 26. J ← answerThe answer shows two significant figures.
The energy absorbed as heat by 20.0 g of gold when it is heated from 25ºC to 35ºC is 26.0 joules.
To find the amount of energy absorbed as heat by a substance, we can use the formula:
[tex]\[ Q = m \cdot c \cdot \Delta T \][/tex]
where:
- Q is the heat energy absorbed (in joules),
- m is the mass of the substance (in grams),
- c is the specific heat capacity of the substance (in joules per gram per degree Celsius),
- [tex]\( \Delta T \)[/tex] is the change in temperature (in degrees Celsius).
Given:
- The mass of gold, m = 20.0 g,
- The specific heat capacity of gold, c = 0.13 J/g·ºC,
- The change in temperature,[tex]\( \Delta T[/tex] = 35ºC - 25ºC = 10ºC .
Plugging these values into the formula, we get:
[tex]\[ Q = 20.0 \text{ g} \cdot 0.13 \text{ J/g.C} \cdot 10.C \] \[ Q = 20.0 \cdot 0.13 \cdot 10 \] \[ Q = 26.0 \text{ J} \][/tex]
Therefore, the energy absorbed as heat = 26.0 joules.
Write a balanced equation for the combustion reaction that occurs between propane and oxygen.
Answer:
Explanation:
The reaction between propane and oxygen is a combustion process for an hydrocarbon.
The formula of propane is given as C₃H₈ and oxygen is written as O₂
For this combustion reaction, the general equation is given as:
Cₓ[tex]H_{y}[/tex] + (x + [tex]\frac{y}{4}[/tex])O₂ → xCO₂ + [tex]\frac{y}{2}[/tex]H₂O
In the reaction between propane and oxygen,
x = 3
y = 8
The reaction is then written as:
C₃H₈ + (3 +[tex]\frac{8}{4}[/tex])O₂ → 3CO₂ + [tex]\frac{8}{2}[/tex]H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Answer:
[tex]\huge \boxed{\mathrm{C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf C_3 H_8 +O_2 \Rightarrow CO_2 + H_2 O[/tex]
Balancing Carbon atoms on the right side,
[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 + H_2 O[/tex]
Balancing Hydrogen atoms on the right side,
[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]
Balancing Oxygen atoms on the left side,
[tex]\sf C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]
[tex]\rule[225]{225}{2}[/tex]
Why is caffeine more soluble in dichloromethane compared to water?
Answer:
Caffeine would require a non-polar solvent to dissolve it
Explanation:
The general rule of solubility is that "like dissolves like". Polar solvents would dissolve polar solutes and non-polar solvents would dissolve non-polar solute.
Water is a polar solvent and would readily dissolve polar compounds such as the range of ionic/electrovalent compound like NaCl and polar covalent compounds.
For non-polar solutes, compounds like dichloromethane would readily dissolve them. Both caffeine and this solvent are both organic compound and would interact readily with one another. Although this compound is slightly polar, it would readily dissolve caffeine
Partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.
Why is caffeine more soluble in dichloromethane?Caffeine is partially polar and we know that water is more polar solvent than dichloromethane which causes caffeine more soluble in dichloromethane compared to water so we can conclude that partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.
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Match the correct term with its definition. The color of the powder of a mineral. Answer 1 The sinking of one lithospheric plate beneath another. Answer 2 A process that includes both the disintegration and decomposition of surface rock material. Answer 3 The chemical altering of the composition of the material. Answer 4 How much matter is in a certain amount of space; mass divided by volume. Answer 5 The physical or mechanical breakdown of Earth's materials. Answer 6 Movement of Earth's materials by glacial action. Answer 7 The ability of a mineral to resist scratching. Answer 8 A type of igneous rock that forms inside the Earth. Answer 9 The rock formed by the cooling and solidifying of molten rock.
Answer:
Explanation:
1.The color of the powder of a mineral.
Answer 1 : Streak
Streak is the color displayed by a mineral in powdered form. The streak of some minerals differs from their original color.
2.The sinking of one lithospheric plate beneath another.
Answer 2 : Subduction
At a convergent margin, a denser lithospheric plate falls beneath the lighter one in a process called subduction. This region is called the subduction zone.
3.A process that includes both the disintegration and decomposition of surface rock material.
Answer 3: Weathering
Weathering is defined as the physical disintegration and chemical decomposition of rocks to form soils and sediments on the earth surface.
4.The chemical altering of the composition of the material.
Answer 4: Chemical weathering
It is the decomposition or altering of earth materials chemically.
5. How much matter is in a certain amount of space; mass divided by volume.
Answer 5 : Density
Density is defined as the mass per unit volume.
6. The physical or mechanical breakdown of Earth's materials.
Answer 6: Physical weathering
Physical weathering is the disintegration of earth materials using mechanical means.
7. Movement of Earth's materials by glacial action.
Answer 7: Glacial erosion
This is the wearing and washing away of earth's materials by action of moving glaciers.
8. The ability of a mineral to resist scratching.
Answer 8: Hardness
Hardness is expressed in an ability to resist deformation and any from of abrasion
9. A type of igneous rock that forms inside the Earth.
Answer 9: Plutonic or intrusive igneous rocks
Igneous rocks that forms within the crust are called plutonic or intrusive igneous rocks.
10. The rock formed by the cooling and solidifying of molten rock.
Answer 10: Igneous rocks
Igneous rocks are rocks that formed from cooling and solidifying of molten rocks
The color of the powder of a mineral is called streak. Subduction is the sinking of one lithospheric plate beneath another. Weathering is the process that includes both the disintegration and decomposition of surface rock material.
Explanation:The color of the powder of a mineral is called the streak.
The sinking of one lithospheric plate beneath another is called subduction.
The process that includes both the disintegration and decomposition of surface rock material is called weathering.
The chemical altering of the composition of a material is called chemical weathering.
The amount of matter in a certain amount of space is called density, which is determined by dividing mass by volume.
The physical or mechanical breakdown of Earth's materials is called mechanical weathering.
The movement of Earth's materials by glacial action is called glacial erosion.
The ability of a mineral to resist scratching is called hardness.
A type of igneous rock that forms inside the Earth is called intrusive igneous rock.
The rock that forms from the cooling and solidifying of molten rock is called igneous rock.
Florida has been spending money to create storm shelters. The state is preparing for . California has been spending money to establish desalination plants. The state is preparing for . NextReset
Answer:answer is hurricane and floods
Explanation:
your welcome ;)
Answer:
Florida is preparing for a hurricane, and California is preparing for drought conditions.
Explanation:
A kind of storm in which the high current winds produces a circular cone mass and damages anything that comes in its way is known as a hurricane. The Florida state is producing shelters in order to develop protection in response to a hurricane.
A condition in which an area possesses a shortage of water at the surface, atmospheric, and the ground level is known as a drought. The development of desalination plants will assist in withdrawing salt from accessible water from sea, ocean, or lake. So that the water from these sources can be utilized for drought situations. Thus, California State is spending money for the development of desalination plants in order to prepare for droughts.