Answer:
Explanation:
Fe + Cl₂ → FeCl₃
a. The balanced equation
All chemical equations obey the law of conservation of matter. To balance this above equation, we either inspect or use mathematical method to obtain a balanced equation.
We put coefficients a, b and c at the back of the compounds as shown below:
aFe + bCl₂ → cFeCl₃
For Fe:
a = c (i)
For Cl:
2b = 3c (ii)
let a = 1, c= 1
Solving for the unknown b, we have:
b = [tex]\frac{3c}{2}[/tex]
b = [tex]\frac{3}{2}[/tex]
The complete reaction equation is therefore:
Fe + [tex]\frac{3}{2}[/tex]Cl₂ → FeCl₃
or
2Fe + 3Cl₂ → 2FeCl₃
Problem a:
Mass of reacting iron = 25g
unknown: number of moles of iron
Solution
To find the number of moles, we apply the mole concept using the expression below:
[tex]number of moles = \frac{mass}{molar mass} \\[/tex]
To find the molar mass of the reactant iron, we know atomic mass of iron is 56g.
The molar mass is therefore, 56gmol⁻¹
[tex]number of moles = \frac{25}{56} \\[/tex]
number of moles of the iron reactant = 0.45mole
Problem b:
From the balanced equation of the reaction:
2Fe + 3Cl₂ → 2FeCl₃
2 moles of Fe produces 2 moles of FeCl₃
So 0.45mole of Fe would produce 0.45 mole of FeCl₃
Problem C:
Applying the mole concept;
mass of FeCl₃ = number of moles of FeCl₃ x molar mass of FeCl₃
number of moles of FeCl₃ = 0.45mole
molar mass of FeCl₃ = ?
Atomic mass of Fe = 56g
Cl = 35.5g
Molar mass of FeCl₃ = 56 + (3 x 35.5) = 56 + 106.5 = 162.5gmol⁻¹
mass of FeCl₃ = 0.45 x 162.5 = 73.1g
How many grams of H2 are needed to produce 13.33g of NH3?
The reaction to form NH3 is : N2 + 3H2-> 2NH3 12,33g NH3 is 12,33/17,03=0,3 =0,724 moles of NH3 moles NH3. So you need 1,5*0,724 = 1,086 moles H2 1,086*2,016 = 2,189 g of H2 is needed ro form 12,33 g NH3
Which consequence of global warming is described as having an increase in growing season changes in migration and loss of species
Answer:
Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species.
Explanation:
Global warming is warming the earth's surface temperature, which causes the changes in our ecosystem like deforestation, soil erosion, climate changes, migration and loss of species etc.
Global warming is caused by the 'Greenhouse effect', major gases are carbon dioxide(9-26%), methane(4-9%), water vapour(36-70%) ozone(3-7%) and nitrous oxide.
Global warming affects on the ocean include rising sea level, meiting glaciers, thermal expansion and ice sheets. It also cause the bird migration which carries high cost of predation and mortality.
Answer:
D. altered ecosystems
Explanation:
Deforestation, increase wildlife extinction, ecosystem imbalances, soil erosion, migration and loss of species are all effects of global warming. These are under the umbrella of consequences from global warming.
Why is it important to make observations first and inferences later
Answer:
Explanation:
Observation leads to drawing of inferences not the other way round. If no observation is made, then there is no basis of making inferences and testing them out.
Observations helps to gather facts and data through which patterns can be deduced and meaningful inferences made out. Observation is made using our five senses. Without first observing and pooling together some data, the basis of a scientific inquiry would falter along the line.
Inferences gives an arching overview to observations made. Inferences are made using prior experiences or knowledge. A times, we can notice some patterns in the data we have gathered and inferences can be made from them.
4. In the chemical equation H202(aq) → H2O(l) + O2(g), the O2 is a
O
A reactant
Bcatalyst
C
solid
OD product
Answer:
02 is a product
Explanation:
it doesnt take part in chemical reaction so its not reactant.02 doesnt alter rate of chemical reaction so it cannot be catalyst. it is gas it is not solid so it is a product.
Answer: D. Product
Explanation:
WHEN parking uphill in a car with a manual transmission you should park with the transmission in
First gear OR reverse gear?????
For a manual transmission, park in first gear when facing uphill, and in reverse when facing downhill, always using the parking brake and turning the wheels away from the curb when parked uphill.
Explanation:When parking uphill in a car with a manual transmission, it is generally recommended to park with the transmission in first gear if you are facing uphill and reverse gear if you are facing downhill. This helps to ensure that if your parking brake fails, the engine will help prevent the car from rolling. However, always remember to use the parking brake regardless of the gear used. It is also advisable to turn your wheels away from the curb when parking uphill, so in the event your car begins to roll, it will roll into the curb which can help stop the car.
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Upon combustion, a compound containing only carbon and hydrogen produces 2.49 g CO2 and 0.763 g H2O . Find the empirical formula of the compound
Answer:
CH2.
Explanation:
The mass of C in the CO2 = 2.49 * 12/(12+32) = 0.6791 g
The mass of Hydrogen in the water = 2 * 1.008 / (2.016 + 16) = 0.1119 g.
Ratio of H to O is 0.1119/ 1.008 : 0.6791/12
= 0.111 : 0.0566
= 2 : 1
The empirical formula is CH2
A container of hydrogen at 172 kpa was decreased to 85.0 kpa producing a new volume of 765 mL. What was the original volume
Answer:
[tex]\boxed{\text{378 mL}}[/tex]
Explanation:
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}{rclrcl}p_{1}& =& \text{172 kPa}\qquad & V_{1} &= & \text{?} \\p_{2}& =& \text{85.0 kPa}\qquad & V_{2} &= & \text{765 mL}\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}172V_{1} & =& 85.0 \times 765\\172V_{1} & = & 65 025\\V_{1} & = &\textbf{378 mL}\\\end{array}\\\text{The original volume was } \boxed{\textbf{378 mL}}[/tex]
Final answer:
Using Boyle's Law, which states that at a constant temperature the pressure and volume of a gas are inversely related, the original volume of hydrogen in the container can be calculated to be approximately 2211 mL.
Explanation:
To find the original volume of the hydrogen gas, we apply Boyle's Law, which states that the pressure of a gas multiplied by its volume is constant at constant temperature (P1V1 = P2V2). In the given problem, we have an initial pressure (P1) of 172 kPa, an unknown original volume (V1), a final pressure (P2) of 85.0 kPa, and a final volume (V2) of 765 mL.
Using the formula, we have:
172 kPa × V1 = 85.0 kPa × 765 mL
Now we solve for V1:
V1 = (85.0 kPa × 765 mL) / 172 kPa
V1 = 380.25 kPa·mL / 172 kPa
V1 = 2210.7558 mL
Therefore, the original volume of the hydrogen gas was approximately 2211 mL.
How are pressure units converted ?
Answer: 1 = 1e-5
Explanation: Divide the pressure value by 100000
Select the correct answer from each drop-down menu.
What is the chemical name of this compound?
Na2S:
Answer:
Sodium Sulphide.
Explanation:
The chemical name is sodium sulphide. The valency of the sulphide ion is 2 while the valency of sodium is 1 . That is why the molecule contains 2 sodium ions.
Answer: sodium sulphide.
Explanation:
[tex]Na_2S[/tex] is an ionic compound because sodium element is a metal and sulphur element is a non-metal. The bond formed between a metal and a non-metal is always ionic in nature.
The nomenclature of ionic compounds is given by:
1. Positive is written first.
2. The negative ion is written next and a suffix is added at the end of the negative ion. The suffix written is '-ide'.
Hence, the name of [tex]Na_2S[/tex] is sodium sulphide.
Therefore, the correct answer is sodium sulphide.
how many low dose 81mg aspirin tablets can be made 1.21kg of aspirin
Answer: The number of tablets that can be made for the given mass of aspirin is 14938
Explanation:
We are given:
Total mass of aspirin = 1.21 kg = 1210000 mg (Conversion factor: 1 kg = 1000000 mg)
Mass of aspirin in 1 tablet = 81 mg
To calculate the number of tablets, we divide the total mass of aspirin to the mass of aspirin in 1 tablet, we get:
[tex]\text{Number of tablets}=\frac{\text{Total mass of aspirin}}{\text{Mass of aspirin in 1 tablet}}[/tex]
[tex]\text{Number of tablets}=\frac{1210000mg}{81mg}=14938.3\approx 14938[/tex]
Hence, the number of tablets that can be made for the given mass of aspirin is 14938
14938 low dose aspirin tablets can be made from 1.21kg aspirin.
CONVERSION FACTOR:
The mass of aspirin is given as 1.21kg and we were asked to determine the number of low dose aspirin tablets weighing 81mg each that can be made from it. First, we need to make both measurements equal. The conversion factor of kg and mg is as follows:Conversion factor: 1 kg = 1000000 mg
Hence, 1.21kg = 1.21 × 1000000
= 1210000 mg
Hence, the number of low dose aspirin tablets that can be made from 1210000mg of aspirin is calculated as follows:= 1210000 ÷ 81
= 14938.27
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petrolium is a mixture consisting mostly of
Answer:Petroleum is a naturally occurring complex mixture made up predominantly of carbon and hydrogen compounds
Explanation:
Earth is like a bar magnet. what does this mean about its magnetic poles
A. there are two magnetic north poles
B. there is only a magnetic pole
C. there are both magnetic north and south poles.
D. there is only a magnetic south pole
It's C that's correct.... (the are both magnetic north and south poles)
Earth is like a bar magnet, there are both magnetic north and south poles. Therefore, option (C) is correct.
Why does the earth behave like a bar magnet?A magnet can be defined as an object that has a north pole and south magnetic pole and a magnetic field. The idea that Earth is a magnet, was first proposed in 1600 by a British physician William Gilbert. He represented the earth as a magnet with help of a spherical magnet.
With a compass, the spherical magnet causes a compass needle to behave in a similar way that Earth causes a compass needle to behave. This indicated that a spherical magnet is a good model to represent that the Earth is a magnet.
Earth has north and south magnetic poles from which the North Pole is located at about 80° north latitude. The magnetic field is strongest at the poles, and magnetic field lines of magnetic force move from the north pole to the south magnetic pole.
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The latent heat of vaporization of water is 540 calories/gram. How many calories are required to completely vaporize 500 grams of water? 1,040 cal 40 cal 270,000 cal 1.08 cal
The amount of heat needed to vaporize the given amount of water is the product of the amount in grams and the latent heat of vaporization in cal per gram. That is,
H = (540 calories / gram)( 500 grams) = 270,000 cal
Thus, the heat needed is 270, 000 calories. The answer is letter C.
Hope this helps :) thats just a sh
Answer:
270,000 cal
Explanation:
In order to calculate the calories needed to completely vaporize 500 grams of water we just have to use the formula of the latent heat of vaporization, we know that it takes 540 calories to vaporize a gram of water, so we just multiply that by the number of grams:
(500 grams of water)(540 calories/gram)= 270,000 calories
It would taje 270,000 calories to vaporize 500 grams of water.
The energy produced by a nuclear reaction comes from:
In the nuclear fusion reaction energy is produced due to remaining mass of the nuclei and in nuclear fission it is released due to breaking of bonds of the nucleus.
What are nuclear reactions?Nuclear reactions are those reactions in which nuclei of two atoms are involved in the reaction.
These are of two types:
Nuclear fission: In this reaction one nuclei will break into two small nuclei and in this process energy is emitted due to breaking of particle into small particles of low mass.Nuclear fusion: In this reaction two nuclei will combine to form one atom of lower mass, and energy is released due to left mass of substance.Hence, energy is produces by the change in mass and breaking of bonds in the nuclear reactions.
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Which of the following is not evidence for the law of conservation of mass during cellular respiration? A. The products from cellular respiration are created from the same elements (carbon, oxygen, and hydrogen) that make up the reactants. B. cellular respiration creates an energy molecule when glucose is broken down
Answer:
Cellular respiration creates an energy molecule when glucose is broken down. B.
You rub a balloon on your head and it becomes negatively charged. The balloon will be MOST attracted to
A) a piece of metal.
B) positively charged hair.
C) the neutrally charged wall.
D) another negatively charged balloon.
Answer: option B is correct. im gonna turn u into a balloon
Explanation:
The answer is B positively charged hair
3. Because tap water is slightly acidic, water pipes made of iron corrode over time, as shown by the balanced ionic equation below. Explain, in terms of chemical reactivity, why copper pipes are less likely to corrode than
iron pipes.
2Fe(s) + 6H*(aq) → 2Fe3+(aq) + 3H2(g)
please someone help with this
acidic tap water form green layer ofcarbonate on copper surface which prevent it from corrosion but iron when react to water and oxygen form rust
also fe lies above than cu in activity series
The chemical reactivity of copper is less than iron and with the formation of stable copper oxide, copper pipes are less likely to corrode.
What is corrosion?The corrosion or rusting is the chemical phenomenon given by an element that results in the decomposition of the metal into stable oxide.
The copper metal in the presence of oxygen forms the more stable and unreactive copper oxide that protect the metal from corrosion.
The chemical equation for the formation of copper oxide is:
4 Cu + O₂ → 2 Cu₂O
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36 grams of water vapor takes up how many liters at room temperature and pressure (293 K and 100 kPa)?
Answer:
V = 48.7 L
Explanation:
We can calculate the volume V, by using the ideal gas law:
P V = n R T
Where we have:
P is the pressure, V is the volume, and T is the temperature T, R is the gas constant, and n is the number of moles of the gas.
According to the international unit systems R is 8.314 J / K. mol.
With this value the P unit will be Pa and the V unit will be m³.
Then,
V = (n R T)/ P
V = [(36/18) × 8.314 × 293] / (100 * 1000)
V = 0.0487 m³
And the volume by litter unit is:
V = 48.7 L
A lab director asks two students, Lydia and Damien, to each select a bottle of a concentrated weak base. When they reach the
cabinets, they find different chemical solutions with varying concentrations. All of the options are bases. Which bottles should they choose?
Lydia should select the bottle of _______. Damien should select the bottle of ________
Answer:
First one is 5.0 M ammonia and the Second one ?
Explanation:
Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.
What are Bases?In a chemical process, bases are compounds that can accept hydrogen ions (H+). They often taste bitter, are slippery to the touch, and have the ability to change the color of litmus paper from red to blue. Typical examples of bases are sodium hydroxide (NaOH), ammonia (NH3), and baking soda (sodium bicarbonate, NaHCO3). Acids, which cause a chemical reaction to release hydrogen ions (H+), are the opposite of bases.
The ability of a base to accept hydrogen ions determines the strength of the base. While weak bases, such as ammonia, have a low affinity for hydrogen ions and can only partially dissociate in water, strong bases, such as sodium hydroxide, have a high affinity for hydrogen ions and can dissociate completely in water. Alkalis play an important role in many chemical processes.
Therefore, Lydia and Damian will select bases with low kb that are present in highly concentrated solutions in the storage cabinet.
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What is the name of this compound?
2-butanone
2-pentanone
4-pentanone
4-butanone
Answer:
2-pentanone
Explanation:
The oxygen atom is attached to the 2nd carbon atom in the longest linear chain, thus the prefix 2. the longest continuous carbon chain has five carbon atoms giving it the prefix pent-. the chemical is a ketone thus the suffix none.
What are genes?
a) the observable characteristic
b) the expressed trait
c) the basic unit of inheritance
d) the measurable factor
C) the basic unit of inheritance
Which statement describes a chemical property of iodine?
Iodine's chemical properties include solubility in various solvents to form violet or brown solutions, and its ability to act as a weak Lewis acid towards iodide ions. It is also the least reactive halogen and does not oxidize other halide ions.
Explanation:Iodine exhibits several chemical properties. It is soluble in chloroform, carbon tetrachloride, carbon disulfide, and many hydrocarbons, forming violet solutions. It dissolves slightly in water, giving brown solutions. Iodine is also soluble in aqueous solutions of iodides, where it forms brown solutions due to its ability to act as a weak Lewis acid towards the iodide ion. In addition, iodine is the least reactive halogen and does not oxidize other halide ions.
Which is a a characteristic of a strong acid ?
Answer:
It completely dissociates in water.
Explanation:
The characteristic of a strong acid is that it completely dissociates when dissolved in water to form ions.
What are acids?
Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Compounds such as HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
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what is the charge on the cation in the ionic compund sodium sulfide
Answer:
Since this is an ionic compound, you must balance the charges so that overall charge of the compound is neutral. Sodium, an alkali metal, has a tendency to lose one electron. As a result sodium normally carries a positive one charge. Sulfur, a nonmetal, has a tendency to gain 2 electrons.
Explanation:
Answer:
Sodium commonly forms a
+
I
ion.
Explanation:
And thus the chemical formula for sodium sulfide is
Na2S , i.e. two sodium ions are required to form a neutral salt with
S2-
4HCl + O2 ⇌ 2H2O + Cl2
Which of the following would result from increasing the volume of oxygen?
The volume of hydrochloric acid increases.
The rate of forward reaction increases.
The rate of backward reaction increases.
The volume of water vapor decreases.
Answer:
The rate of forward reaction increases.
Explanation:
Le Châtelier's principle states that when there is an dynamic equilibrium, and this equilibrium is disturbed by an external factor, the equilibrium will be shifted in the direction that can cancel the effect of the external factor to reattain the equilibrium.Increasing the volume of oxygen:
will increase the concentration of oxygen (reactants), so the equilibrium will be shifted to the right side (products side) to suppress the effect of increasing the volume of oxygen.
So, the right choice is: The rate of forward reaction increases.
How many grams are in 11.9 moles of chromirum
Answer:
Explanation:
Method 1 proportion
1 mole of chromium is 52 grams
11.9 moles = x grams
1/11.9 = 52/x Cross multiply
x = 11.9 * 52
x = 618.8 grams
Now I have used an approximate mass for Chromium. The answer you get here is expected to reflect the weigth given on your periodic table Use that to get your answer. You should give a number very close to mine. Round to 3 places as in 619.
Method Two Formula
mols = given mass / molecular mass
11.9 = given mass / 51.9961 Multiply both sides by 51.9961
11.9 *51.9961 = given mass
given mass = 618.75
given mass = 619
In what characteristic property must two liquids differ if a mixture of them is to be separated by fractional distillation
Answer:
Boiling point
Explanation:
If the liquids have different boiling points, you can separate them by distillation.
You must carefully control the temperature, so only the liquid with the lower boiling point evaporates, and you can collect it using a condenser.
The boiling points should differ by at least 40 °C for a simple distillation to give good separation.
In an investigation that uses the scientific method, which step immediately follows asking a question?
O presenting the results
O making observations
O creating a hypothesis
O designing an experiment
Answer:
creating a hypothesis.
Explanation:
you need to have a hypothesis to then start designing the exp.
Answer:
its c)creating a hypothesis.
Explanation:
just took quiz
PLEASE HELP
An aggregate is one type of land resource. What is an aggregate?
a layer of solid rock found beneath soil
the top layer of soil
a natural mixture of sand, gravel, and crushed stone
a naturally occurring mineral or rock
Answer:
mixture of sand gravel and crushed stone
Answer:
A natural mixture of sand, gravel, and crushed stone.
Explanation:
An aggregate refers to a composite material commonly used in construction, made up of a collection of particles, including sand, gravel, and crushed stone. These materials are often used in the production of concrete, asphalt, and other building materials to provide structural stability and durability. Aggregates are sourced from natural deposits or quarried from larger rock formations and are essential in the construction industry due to their versatility and availability.
calculate the pressure in atm occupied by this gas at 42.5 liters,65c,1.52 moles
Answer:
0.9925 atm.
Explanation:
We can use the general law of ideal gas: PV = nRT.
where, P is the pressure of the gas in atm (P = ??? atm).
V is the volume of the gas in L (V = 42.5 L).
n is the no. of moles of the gas in mol (n = 1.52 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 65°C + 273 = 338.0 K).
∴ P = nRT/V = (1.52 mol)(0.0821 L.atm/mol.K)(338.0 K)/(42.5 L) = 0.9925 atm.