Answer:
50. mL
Explanation:
How many copies of F2 are required to balance this chemical equation? N2 + __F2 = 2NF3 a) 3 b) 4 c) 5 d) 6
Answer: a) 3
On the right side of the equation you have 6F, so you need 3 copies of F2 to balance the equation.
Answer:
a) 3
Explanation:
The unbalanced combustion reaction is shown below as:-
[tex]N_2+F_2\rightarrow 2NF_3[/tex]
On the left hand side,
There are 2 nitrogen atoms and 2 fluorine atoms
On the right hand side,
There are 2 nitrogen atoms and 6 fluorine atoms
Nitrogen atoms are balanced and only fluorine atoms have to be balanced by applying a stoichiometric coefficient of 3 in from of [tex]F_2[/tex] in the reactant side.
Thus, the balanced reaction is:-
[tex]N_2+3F_2\rightarrow 2NF_3[/tex]
Coefficient in front of the [tex]F_2[/tex] in the balanced equation - 3
What is the approximate vapor pressure when the gas condenses at 80°C?
A. 200
B. 5
C. 760
D. 400
Answer: D. 400
Explanation: The given image of the graph explains the relation between the pressure and the temperature of the substance.
Through this graph, one can find the approximate vapor pressure at any phase of the substance.
Thus as we can observe from the graph that the the approximate vapor pressure when the gas condenses at 80°C is 400.
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What happens to the particles of a solid when the solid changes into a liquid?
A. They increase in size.
B. They decrease in size.
C. The attractive force between them increases.
D. The attractive force between them decreases.
Answer:
C
Explanation:
if you heat up a solid - you give it some energy. This causes the particles to move more and the solid to change into a liquid, or melt. If the liquid is heated then it may evaporate and turn into a gas. Taking energy away from a gas (cooling it down) may cause it to turn into a liquid - or condense.
Answer: D. The attractive force between them decreases.
Explanation:
Solid state : It is a state in which the particles are closely packed and does not have any space between them. They have strong intermolecular forces of attraction between them. This state has a definite shape and volume.
Liquid state : It is a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another.Theintermolecular forces are less as compared to the solids.This state has a definite volume but does not have a fixed shape.
Fusion process is a process where solid state changes to liquid state.The size of particles remain same but the attractive forces between them decrease, thus leading to a random motion of particles.
if a 25.0 ml sample of sulfuric acid is titrated with 50.0 ml of 0.200 M potassium hydroxide to a phenolphthalein endpoint, what is the molarity of the acid?
A) 0.150 M
B) 0.100 M
C) 0.200 M
D) 0.300 M
E) 0.400 M
Final answer:
The molarity of sulfuric acid when titrated with potassium hydroxide, given the volumes and molarity of KOH used, is calculated to be 0.200 M, option C.
Explanation:
To find the molarity of sulfuric acid (H₂SO₄) when titrated with potassium hydroxide (KOH), we use the equation for the reaction:
H₂SO₄ (aq) + 2KOH(aq) → K₂SO₄ (aq) + 2H₂O (l)
Note that the stoichiometry requires 2 moles of KOH to neutralize 1 mole of H₂SO₄. Given that 50.0 mL of 0.200 M KOH is used, we can calculate the moles of KOH used:
Moles of KOH = volume (L) × molarity (M) = 0.050 L × 0.200 M = 0.0100 molesSince it takes 2 moles of KOH to neutralize 1 mole of H₂SO₄, the moles of H₂SO₄ neutralized will be half that of KOH used:
Moles of H₂SO₄ = 0.0100 moles KOH ÷ 2 = 0.00500 molesFinally, to find the molarity of H₂SO₄ in the 25.0 mL sample:
Molarity of H₂SO₄ = moles of acid ÷ volume of solution (L) = 0.00500 moles ÷ 0.025 L = 0.200 MTherefore, the molarity of the sulfuric acid is 0.200 M, which corresponds to option C.
A 100-kg moving at 15 m/s collides with a 50-kg cart at rest causing both cars to move together in the same direction. If momentum is conserved, at what speed are the two carts now moving?
Answer:
30m/s
Explanation:
100 / 50 = 2 * 15 = 30m/s
Answer:
[tex]\boxed{\text{10 m/s}}[/tex]
Explanation:
Data:
Cart 1: m₁ = 100 kg; v =15 m/s
Cart 2: m₂ = 50 kg; v₂ = ?
Calculations:
I assume that the two carts are going at the same speed v₂ after the collision.
[tex]\begin{array}{rcl}\text{Momentum before collision} & = & \text{Momentum after collision} \\\text{100 kg} \times\text{15 m/s} & = &\text{100 kg} \times v_{2} + \text{50 kg} \times v_{2}\\\text{1500 m/s} & = & 100 v_{2} +50 v_{2}\\\text{1500 m/s} & = & 150 v_{2}\\v_{2}& =&\textbf{10 m/s}\\\end{array}\\\\\text{The two carts are now moving at a speed of }\boxed{\textbf{10 m/s}}[/tex]
What is the oxidation state for a mn atom?
The oxidation state of a Mn atom in its elemental state is zero. However, in compounds, Mn has multiple potential oxidation states depending on the number of electrons it has lost.
Explanation:The oxidation state of an atom is typically zero when it is in its elemental state. In the case of a manganese (Mn) atom, this rule applies: the manganese atom has an oxidation state of zero.
However, this can change under certain conditions. For instance, in a chemical reaction, the oxidation state of Mn can vary. Transition metals like Mn usually have multiple oxidation states due to their ability to lose different numbers of d or s orbital electrons.
For example, in a compound such as MnO2, the oxidation state of Mn is +4. Here, Mn has lost four electrons. In another compound such as Mn2+, Mn has lost two electrons, giving it an oxidation state of +2.
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Final answer:
The oxidation state of Mn in the permanganate ion (MnO₄) is +7. This is calculated using the known oxidation state of oxygen (-2) and balancing it with the overall charge of the permanganate ion (-1).
Explanation:
The oxidation state of manganese (Mn) varies depending on the compound it is in. For instance, in the permanganate ion (MnO₄), the oxidation state of Mn is determined using the known oxidation state of oxygen, which is -2. Since there are four oxygen atoms, their combined oxidation state is -8. The permanganate ion itself carries an overall charge of -1, so when adding up the oxidation states of all atoms in the ion, their sum must equal this charge.
The calculation is as follows: Mn + (-2) × 4 = -1, which simplifies to Mn - 8 = -1. Solving for Mn gives us an oxidation state of +7. Therefore, in MnO₄, manganese has an oxidation state of +7. This demonstrates that manganese can have a high oxidation state and act as a strong oxidizing agent.
In other compounds, such as MnO₂ or Mn₂O₇, Mn may have different oxidation states, such as +4 or +7, respectively. The principle is to always include the charge on the atom, and balance the oxidation states with the overall charge of the compound or ion.
What is the volume in liters of 0.500 mol of c3h8 gas at stp
Answer:
11.21 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, Standard P).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = 0.5 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 273 K, Standard T).
∴ V = nRT/P = (0.5 mol)(0.0821 L.atm/mol.K)(273 K)/(1.0 atm) = 11.21 L.
circle the precipitate in the following the reactions: Ba (aq) + Co( aq) --> BaCo3 (s)
Answer:
BaCo3 (s)
Explanation:
Because it is being formed from two aqueous solutions, and the (s) indicates that it is a solid. Precipitate means "formed into solid". Since BaCo3 is a product, is solid, is formed from two aqueous solutions, it is a precipitate.
When you breathe out, there is water vapor in your breath. When you breathe on a cold window in the winter, the window gets tiny droplets of moisture on it or “fogs up.” What happens to the molecules of water vapor as they get near the cold window?
The water molecules in your breath are the gas water vapor. They slow down as they transfer some of their energy to the cold window. The attractions between the slower-moving water vapor molecules bring them together to form tiny droplets of liquid water.
Which species in each pair is a better oxidizing agent under standard-state conditions? (a) br2 au3+ (b) h2 ag+ (c) cd2+ cr3+ (d) o2 in acidic media o2 in basic media?
Answer:
(a) Au³⁺; (b) Ag⁺; (c) Cd²⁺; (d) O₂ in acidic media
Explanation:
You've had Trends in the Periodic Table. Now, here are Trends in Standard Reduction Potentials.
The strength of oxidizing agents increases from bottom to top on the left-hand side. The strength of reducing agents increases from top to bottom on the right-hand side.Thus, for each pair of half reactions, we need to look only at which one has the more positive standard reduction potential.
(a) Br₂/Au³⁺
Au³⁺(aq) + 3e⁻ ⟶ Au(s) 1.498 V
Br₂(ℓ) + 2e⁻ ⟶ 2Br⁻(aq) 1.066 V
Au³⁺ is the stronger oxidizing agent.
(b) H₂/Ag⁺
Ag⁺(aq) + e⁻ ⟶ Au(s) 0.7996 V
H₂(g) + 2e⁻ ⟶ 2H⁻(aq) -2.33 V
Ag⁺ is the stronger oxidizing agent.
(c) Cd²⁺/Cr³⁺
Cd²⁺(aq) + e⁻ ⟶ Cd(s) -0.4030 V
Cr³⁺(aq) + 3e⁻ ⟶ Cr(s) -0.744 V
Cd²⁺ is the stronger oxidizing agent.
(d) O₂, H⁺/O₂, OH⁻
O₂(g) + 4H⁺(aq) + 4e⁻ ⟶ 2H₂O(ℓ) 1.224 V
O₂(g) + H₂O(ℓ) + 4e⁻ ⟶ 4OH⁻(aq) 0.401 V
O₂ in acid is the stronger oxidizing agent.
The more potent oxidizing agents in the given pairs are: Br2, Ag+, Cr3+ and O2 under acidic conditions. These substances readily attract and bind with electrons thereby facilitating the oxidation process in a chemical reaction.
Explanation:In the given pairs, the better oxidizing agents under standard-state conditions are: (a) Br2 in pair Br2 and Au3+, because Br2 gains electrons more readily. (b) Ag+ in pair H2 and Ag+, since Ag+ has a higher reduction potential. (c) Cr3+ in pair Cd2+ and Cr3+. Lastly, (d) O2 in acidic media tends to be a stronger oxidizing agent than O2 in basic media because more readily available H+ ions in acidic conditions facilitate the oxidation process.
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Consider the conversion of a substance from solid to liquid. At one atmosphere pressure and at the normal melting point of the substance, which one of the following terms below equals zero for the system?
∆E
∆H
∆S
∆G
answer Delt G = 0 for the equilibrium
Final answer:
At one atmosphere pressure and the normal melting point, the term that equals zero for the conversion of a substance from solid to liquid is ΔG, the change in Gibbs free energy.
Explanation:
The student's question is related to phase transitions and thermodynamics, specifically the transition of a substance from solid to liquid. At one atmosphere pressure and at the normal melting point of the substance, the term that equals zero for the system is ΔG, which is the change in Gibbs free energy.
This is because at the melting point, the system is in equilibrium, and the Gibbs free energy of the solid and liquid phases are equal. As a result, there is no net change in Gibbs free energy during the transition, leading to ΔG = 0, in accordance with the equation ΔG = ΔH-TΔS at equilibrium.
Conduction occurs more easily between solids and liquids. This is because the particles in gases are
Answer:
farther apart and move faster.
Explanation:
Which of the following properties is shared by solids and liquids? Their particles are far apart. Their particles move randomly. They have a definite volume. They consist of charged particles.
Answer:
They have a definite volume
Explanation:
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Answer: Option (c) is the correct answer.
Explanation:
In solids, particles are held together by strong intermolecular forces of attraction between them. Due to this reason solids acquire a definite shape and volume.
Whereas in liquids, particles are held by less strong intermolecular forces of attraction. As a result, molecules are able to slide past each other. Liquids acquire the shape and volume of a container in which they are kept.
Hence, liquids also show fixed volume.
Thus, we can conclude that property shared by solids and liquids is that they have a definite volume.
Elements occur in a number of isotopic forms. In this problem, you will learn about the notation used to distinguish different isotopes.How many protons Z and how many neutrons N are there in a nucleus of the most common isotope of silicon, 28/14Si?
Answer:
There are 14 protons (Z) and 14 neutrons (N) in a nucleus of the most common isotope of silicton.Explanation:
The notation of the most common isotope of silicon is:
[tex]^{28}_{14}Si[/tex]The superscript, 28, to the left of the chemical symbol, Si, is the mass number, usually identified with the symbol A, and it is the sum of the protons and neutrons.
The subscript, 14, to the left of the chemical symbolr, Si, is the atomic number, Z, which is the number of protons.
Then, you have this equation:
mass number = number of protons + neutrons, or, in symbols:A = Z + NThe number of protons is the same for any isotope of the same element. This is, all the isotopic forms of silicon have the same number of prtons: 14
The number of neutrons is determined from the equation A = Z + N, solving for N:
N = A - Z = 28 - 14 = 14.Hence, the most common isotope of silicon has 14 protons and 14 neutrons.
Often atoms join so that each atom will have
a. an even number of electrons.
b. an outermost energy level that is full of electrons.
c. an equal number of protons and neutrons
d. more electrons than either protons or neutrons
Answer:
b. an outermost energy level that is full of electrons.
Explanation:
The reason why atoms combines is to have a complete outermost shell. When the outermost shell or valence shell of atoms are completely filled withe electrons, they become very stable. Noble gases for example, shows no tendency to react with other atoms because their outermost energy level is completely filled.
The tendency to have a completely filled outer energy level is what drives most atoms into bonding.
Atoms often form bonds in ways that lead to full outer levels of electrons, which provides stability, explained by the octet rule.
Explanation:Atoms often join in a way that each atom will have an outermost energy level that is full of electrons. This principle is known as the octet rule, which states that, atoms seek to have eight electrons in their outermost energy level to achieve a stable configuration similar to that of noble gases. For instance, oxygen has six electrons in its outer shell, and thus needs two more to complete its outermost energy level, which it can get by forming a bond with, say, two hydrogen atoms (each providing one electron).
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Why is peer review an Important part of the scientific process
Peer review is an Important part of the scientific process as it permits scientist to have their work translated into other language. Therefore, the correct option is option A.
What is peer review?Peer review is the evaluation of a piece of work by one or more people with similar abilities to the creators (peers). It acts as a tool for capable experts in the sector to self-regulate.
Depending on the type of activity and the field or profession it occurs in, such as medicine, peer review can be broken down into a variety of categories. Peer review is an Important part of the scientific process as it permits scientist to have their work translated into other language.
Therefore, the correct option is option A.
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so i am doing a science project and i am doing it on mold i put water on the bread and cheese and left one in the dark and one in the light FOR A TWO WEEKS it isnt working why not
Answer:
because the bread and cheese is absorbing the water whereas if you leave it dry in a moist humid place mold will start to appear
Explanation:
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During an experiment, 95 grams of calcium carbonate reacted with an excess amount of hydrochloric acid. If the percent yield of the reaction was 82.15%, what was the actual amount of calcium chloride formed?
CaCO3 + HCl → CaCl2 + CO2 + H2O
A. 105.3 grams
B. 101.1 grams
C. 95.6 grams
D. 86.5 grams
Answer:
D. 86.5 grams
Explanation:
∵ The percentage yield = (actual yield/theoretical yield)*100.
We need to calculate the theoretical yield:
From the balanced reaction:
CaCO₃ + 2HCl → CaCl₂ + CO₂ + H₂O,
It is clear that 1 mol of CaCO₃ reacts with 2 mol of HCl to produce 1 mol of CaCl₂, 1 mol of CO₂, and 1 mol H₂O.
We need to calculate the no. of moles of 95.0 g CaCO₃:n = mass/molar mass = (95.0 g)/(100.0869 g/mol) = 0.95 mol.
Using cross multiplication:
1 mol of CaCO₃ produce → 1 mol of CaCl₂, from stichiometry.
∴ 0.95 mol of CaCO₃ produce → 0.95 mol of CaCl₂.
∴ The mass of CaCl₂ (theoretical yield) = (no. of moles) * (molar mass) = (0.95 mol)*(110.98 g/mol) = 105.34 g.
∵ The percentage yield = (actual yield/theoretical yield)*100.
The percentage yield = 82.15%, theoretical yield = 105.34 g.
∴ The actual yield of CaCl₂ = (The percentage yield)(theoretical yield)/100 = (82.15%)(105.34 g)/100 = 86.53 g ≅ 86.5 g.
So, the right choice is: D. 86.5 grams.Answer:
The correct answer is option D.
Explanation:
[tex]CaCO_3 + 2HCl \rightarrow CaCl_2 + CO_2 + H_2O[/tex]
Moles of calcium carbonate = [tex]\frac{95 g}{100.08 g/mol}=0.9492 mol[/tex]
According to reaction,1 mol of calcium carbonate gives 1 mol of calcium chloride.
Then 0.9492 mol of calcium carbonate will give :
[tex]\frac{1}{1}\times 0.9492 mol=0.9492 mol[/tex] of calcium chloride.
Theoretical yield of the calcium chloride = [tex]110.98 g/mol\times 0.9492 mol=105.3422 g[/tex]
Experimental yield of calcium chloride = 95 g
Percentage yield of a calcium chloride = 82.15 %
[tex]\frac{\text{experimental yield}}{\text{Theoretical yield}}\times 100=82.15\%[/tex]
[tex]\frac{\text{experimental yield}}{105.3422 g}\times 100=82.15\%[/tex]
Experimental yield = 86.53 g
The closest option to our answer is option D. Hence, option D is correct answer.
Examine the following reaction.
HBrwater—→H++Br−
What process is being shown?
hydronium formation
neutralization
acid dissociation
base dissociation
Answer: acid dissociation
Explanation:
According to the Bronsted-Lowry conjugate acid-base theory, an acid is defined as a substance which looses donates protons and thus forming conjugate base and a base is defined as a substance which accepts protons and thus forming conjugate acid.
For the given chemical equation:
[tex]HBr+H_2O\rightarrow H^+(aq.)+Br^-(aq.)[/tex]
Here, [tex]HBr[/tex] is loosing a proton, thus it is considered as an acid and the reaction is acid dissociation.
Hydroium ion is [tex]H_3O^+[/tex]
Neutralization reaction is a chemical reaction in which an acid reacts with base to produce salt and water.
[tex]HA+BOH\rightarrow H_2O+BA[/tex]
Thus the reaction is acid dissociation.
Which is an advantage of using space observatories for space exploration? Allows scientists to send a crew into space allows scientists to repair damaged satellites allows scientists to collect samples with a rover allows scientists to avoid the effects of light pollution
Answer:
allows scientists to avoid the effects of light pollution
Explanation:
Space Observatories are instruments such as telescopes that are used for explorations in space.
The main functions of a space observatory is that it helps scientists to be able to view very clear images of objects that are in space such as stars and other planetary bodies.
Space observatories when used on earth , have the tendency to absorb ultraviolet and infrared rays which can be very dangerous to the health of scientists but when these space observatories are used for explorations in space, it's major benefit is that it protects the scientists from light pollution such as ultraviolet radiation and infrared light.
Read the excerpt from Levitt and Dubner’s Freakonomics.
If morality represents the way we would like the world to work and economics represents how it actually does work, then the story of Feldman’s bagel business lies at the very intersection of morality and economics. Yes, a lot of people steal from him, but the vast majority, even though no is watching over them, do not. This outcome may surprise some people—including Feldman’s economist friends, who counseled him twenty years ago that his honor-system scheme would never work. But it would not have surprised Adam Smith. In fact, theme of Smith’s first book, the Theory of Moral Sentiments, was the innate honesty of mankind. “How selfish soever man may be supposed,” Smith wrote, “there are evidently some principles in his nature which interest him in the fortune of others, and render their happiness necessary to him, though he derives nothing from it, except the pleasure of seeing it.”
Which best describes the authors’ purpose in using a quotation from Adam Smith’s book The Theory of Moral Sentiments?
to highlight their knowledge of Scottish philosophers
to prove that people are inherently dishonest
to demonstrate that incentive is the driving force behind cheating
to lend credibility and additional support to their conclusion
Answer:
D
Explanation:
100% on test
The correct answer is: to lend credibility and additional support to their conclusion.
In the excerpt from Levitt and Dubner Freakonomics, the authors are discussing the intersection of morality and economics through the example of a bagel business that operates on an honor system. Despite the predictions of economists that such a system would fail due to rampant theft, the business succeeds because most people choose not to steal even when unsupervised.
The authors then reference Adam Smith's The Theory of Moral Sentiments, where Smith discusses the innate honesty and empathy within humanity.
The purpose of including the quotation from Adam Smith is not merely to showcase their knowledge of the Scottish philosopher, as this would be more of a display of erudition rather than a contribution to their argument.
Similarly, they are not using the quotation to prove that people are inherently dishonest, as Smith's work actually suggests the opposite that there is an inherent honesty and concern for others in human nature.
The authors also do not use the quotation to argue that incentive is the driving force behind cheating.
While incentives are a significant topic in economics and are discussed in Adam Smith's other major work, The Wealth of Nations, the quotation provided here emphasizes the natural inclination towards honesty rather than the role of incentives in promoting dishonesty.
Instead, the authors use Smith's quotation to lend credibility and additional support to their conclusion that the honor-system scheme works because of an inherent sense of morality in most people.
By invoking a respected economist and moral philosopher who argued for the existence of moral principles that guide human behavior, even when there is no direct benefit to oneself, Levitt and Dubner strengthen their argument that moral behavior can prevail in economic transactions, contrary to what might be expected based on pure economic self-interest.
Adam Smith's authority in both economics and moral philosophy makes his perspective particularly relevant and persuasive in supporting the authors' observations about human behavior in the context of the bagel business.
the elements lithium and oxygen react explosively to form lithium oxide,Li2O. how many moles of lithium oxide will form if 4.37 mol of lithium tract?
4Li(s) +O2(g) -> 2Li2O(s)
From the equation,
4 mole of lithium produces 2 mole of lithium oxide
4.37 mol of lithium produces (4.37÷4)x2 mol of lithium oxide
You have a solution that is 18.5% (v/v) methyl alcohol. if the bottle contains 2.61 l of solution, what is the volume (v) in milliliters of methyl alcohol?
The answer is in the photo.
In , the bonds cause the carbon chain to bend or "kink", which gives the molecules an irregular shape. as a result, acids cannot stack as closely as and thus have dispersion forces between their carbon chains.
In unsaturated fatty acids, the cis double bonds cause the carbon chain to bend or "kink", which gives the molecules an irregular shape.
Unsaturated fatty acid carbon chains contain one or more double bonds with a terminal carboxylic group (–COOH), unlike saturated fatty acids, which contain no double bonds. These fatty acids are subdivided into two groups depending on the number of double bonds. A single double bond is termed monounsaturated, and those with more than one double bond are termed polyunsaturated.
In addition to nomenclature systems describing the number of carbon atoms and location of the double bond(s), a “cis-” or “trans-” notation describes the configuration. A cis- notation means hydrogen atoms are on the same side as the carbon double bond, As a result, cis fatty acids cannot stack as closely as saturated fatty acids and thus have fewer dispersion forces between their carbon chains.
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Which of the following is true about hydropower? It changes the surrounding ecosystem. It does not produce greenhouse gases. It produces harmful radiation. It burns fossil fuels.
Answer:
A
Explanation:
One of the main complaints about hydropower is that it will change the ecosystem. You can read about the history of any dam and you will find that most of them have involved evacuation. That means that farmland was lost and replaced by a lake behind the dam. The energy comes from water cascading over the top of the dam to its bottom.
It does not produce radiation.
It does not burn fossil fuels. It's clean and does not pollute the air.
So there are no greenhouse gases involoved.
Answer:
change the ecosystem
Explanation:
Upon combustion, a compound containing only carbon and hydrogen produces 2.67 g[tex]CO_{2}[/tex] and 1.10 g[tex]H_{2}O[/tex]. Find the empirical formula of the compound.
Answer:
[tex]\boxed{\text{CH$_{2}$}}[/tex]
Explanation:
1. Calculate the mass of each element
[tex]\text{Mass of C} = \text{2.67 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.7286 g C}\\\\\text{Mass of H} = \text{1.10 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.1231 g H}[/tex]
2. Calculate the moles of each element
[tex]\text{Moles of C = 0.7286 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.060 67 mol C}\\\\\text{Moles of H = 0.1231 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.1221 mol H}[/tex]
3. Calculate the molar ratios
Divide all moles by the smallest number of moles.
[tex]\text{C: } \dfrac{0.06067}{0.06067}= 1\\\\\text{H: } \dfrac{0.1221}{0.06067} = 2.015[/tex]
4. Round the ratios to the nearest integer
C:H = 1:2
5. Write the empirical formula
The empirical formula is [tex]\boxed{\text{CH$_{2}$}}[/tex]
The empirical formula of the compound is CH.
To find the empirical formula of the compound, we need to determine the molar ratios of carbon and hydrogen in the compound based on the masses of carbon dioxide (CO₂) and water (H₂O) produced during combustion.
First, we calculate the moles of carbon in CO₂:
The molar mass of CO₂ is 44.01 g/mol (12.01 g/mol for C and 2 × 16.00 g/mol for O₂).
Moles of CO₂ = 2.67 g / 44.01 g/mol = 0.0607 mol
Since there is one mole of carbon in one mole of CO₂, the moles of carbon are also 0.0607 mol.
Next, we calculate the moles of hydrogen in H₂O:
The molar mass of H₂O is 18.015 g/mol (2 × 1.008 g/mol for H₂ and 16.00 g/mol for O).
Moles of H₂O = 1.10 g / 18.015 g/mol = 0.0611 mol
The moles of hydrogen:
Moles of H in H₂O = 2 × Moles of H₂O = 2 × 0.0611 mol = 0.1222 mol
Now, let's re-calculate the molar ratio of carbon to hydrogen:
Moles of C / Moles of H = 0.0607 mol / 0.1222 mol = 1/2
This ratio simplifies to:
C: 1
H: 1
Therefore, the correct empirical formula of the compound is CH, not CH₂ as previously stated. The error in the initial calculation has been corrected, and the correct empirical formula is CH.
#11 A student measures a samples mass to 45.5 g. the true mass is determined later to be 42.3 g. What is the students percent error
Answer:
7.565 %.
Explanation:
Given the formula below:Error % = [True value - Measured value) /True value] ×100
one can Calculate the percent error for the experimentwhere, True value = 42.3 g.
Measured value = 45.5 g.
Error % = [║(True value - Measured value)║ /True value] ×100
Error % = [║(42.3 g) - (45.5 g)║ /(42.3 g)] × 100 = 7.565 %.
What do acidic solutions have high concentrations of?
Answer:
Hydrogen ions
Explanation:
Acidic solutions have high concentrations of hydronium ions and a lower concentration of hydroxide ions. The concentration of hydronium ions determines the acidity of the solution.
Explanation:Acidic solutions have high concentrations of hydronium ions (H+) and a proportionally lower concentration of hydroxide ions (OH-). This is due to the ionization of the acid, which releases H+ ions into the solution. The concentration of hydronium ions is a critical determinant of the solution's acidity.
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Which of the following statements regarding alpha particles are true? Check all that apply.a. Alpha particles have a mass number of 4b. Alpha particles have a nulear charge of +1c. Alpha particle formation is accompanied by the conversion of a proton into a neutrond. Alpha particle formation is accompanied by the conversion of a neutron into a proton
Answer:
The only true statement is:
a. Alpha particles have a mass number of 4Explanation:
Alpha particles are radiactive particles equivalent to a helium nucleus, so they have two protons and two neutrons.
Hence, alpha particles, α, are represented as:
⁴₂HeThe superscript 4 to the left of the chemical symbol is the mass number: 2 protons + 2 neutrons = 4
The subscript 2 to the left of the chemical symbol is the atomic number: 2 protons = 2.
Hence, the statement "a. Alpha particles have a mass number of 4" is true.
As for the other statements, you have:
b. Alpha particles have a nulear charge of +1: false
Since, these particles are the nucleous of the helium atom, the nuclear charge equals the number of protons of this atom: +2. Hence, the statement is false.
c. Alpha particle formation is accompanied by the conversion of a proton into a neutron and d. Alpha particle formation is accompanied by the conversion of a neutron into a proton. (both false)
The conversion of a protons into a neutrons and the conversion of a neutron into a proton are product of other kind of radiactive desintegrations.
The conversion of a proton into a neutron involves the emission of a positron ( particle with same mass as the electron but positive charge) from the nucleus, which is represented as ⁰₊₁β.The conversion of a neutron into a proton involves the emssion of an electron from the nucleus, which is the emission of a beta particle represented as ⁰₋₁β.Therefore, these last two statements are also false.
True statements about alpha particles include that they have a mass number of 4 and that their formation involves the conversion of a neutron into a proton, whereas their nuclear charge is not +1 but +2.So,option a,d is correct.
In addressing the question about alpha particles, here are the true statements:
a. Alpha particles have a mass number of 4
d. Alpha particle formation is accompanied by the conversion of a neutron into a proton
Alpha particles are indeed equivalent to a helium nucleus with two protons and two neutrons, giving them a mass number of 4. Their charge is actually +2, not +1 as suggested in option b. During alpha decay, the parent nucleus sheds an alpha particle, leading to the creation of a new element with an atomic number reduced by 2 and a mass number decreased by 4. This transformation involves the conversion of a neutron into a proton within the parent nucleus.
Which of the following statements best compares geothermal energy and the energy from natural gas based on their rates of renewal? Natural gas has a slower rate because any amount extracted is far lower than its generation inside Earth. Natural gas has a faster rate because, being a carbon resource, it quickly replenishes as part of the carbon cycle. Geothermal energy has a faster rate because a vast amount of heat energy is always present inside Earth's core. Geothermal energy has a slower rate because the water present below Earth's surface cools down periodically.
Final answer:
Geothermal energy has a faster renewal rate than natural gas because it utilizes the constant and virtually inexhaustible heat from Earth's core, contrasting with natural gas's slow replenishment rate.
Explanation:
Comparing geothermal energy to natural gas based on their rates of renewal reveals significant differences in their replenishment. Natural gas, a fossil fuel, forms over millions of years from the decay of organic matter under high pressure and temperature. This process is extremely slow, indicating that natural gas has a much slower rate of renewal once extracted from the Earth. In contrast, geothermal energy harnesses the constant heat emanating from the Earth's core, a result of radioactive decay and the original heat from planetary formation. This heat is virtually inexhaustible on human timescales, making geothermal energy effectively renewable with a much faster rate of renewal in practical terms.
The correct statement is: Geothermal energy has a faster rate because a vast amount of heat energy is always present inside Earth's core.
While both resources provide energy, their rates of renewal starkly contrast due to their different origins and mechanisms of replenishment. Natural gas, being a non-renewable resource, does not replenish at a rate that can sustain its consumption. Conversely, geothermal energy, with its endless supply of heat from the Earth's interior, offers a sustainable alternative with minimal environmental impact.