# Beane Unit 5 Chemistry Test

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• 1.

### What is the molar mass of water?

• A.

18

• B.

18.02

• C.

17.01

• D.

16

B. 18.02
Explanation
The molar mass of water is 18.02. Molar mass is the mass of one mole of a substance, and in the case of water, it is calculated by adding the atomic masses of two hydrogen atoms (1.01 g/mol each) and one oxygen atom (16.00 g/mol). Therefore, the molar mass of water is 2(1.01 g/mol) + 16.00 g/mol = 18.02 g/mol.

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• 2.

### What is the value used for Avogadro’s number?

• A.

6.0

• B.

6.02

• C.

6.02 x10^23

• D.

6.02 x 10^32

C. 6.02 x10^23
Explanation
Avogadro's number is a fundamental constant in chemistry and physics that represents the number of atoms, molecules, or particles in one mole of a substance. The value used for Avogadro's number is 6.02 x 10^23, which means that one mole of any substance contains 6.02 x 10^23 atoms or molecules. This value is derived from experimental measurements and is widely accepted in scientific calculations and equations.

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• 3.

### Which of the following compounds has a formula with no subscripts?

• A.

Nitrogen dioxide

• B.

Aluminum phosphate

• C.

Sodium hydroxide

• D.

Lithium nitrate

C. Sodium hydroxide
Explanation
Sodium hydroxide has a formula with no subscripts because it consists of only one sodium atom and one hydroxide ion. The sodium atom has a +1 charge, while the hydroxide ion has a -1 charge. To balance the charges, only one of each is needed, resulting in the formula NaOH.

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• 4.

### A compound  is found to contain 46.66% nitrogen and 53.34 % oxygen, what is the empirical formula?

B.
Explanation
The empirical formula of the compound can be determined by converting the percentages of nitrogen and oxygen into moles. Assuming a 100g sample, there would be 46.66g of nitrogen and 53.34g of oxygen in the compound. Using the molar masses of nitrogen (14.01 g/mol) and oxygen (16.00 g/mol), we can calculate the moles of each element. The ratio of moles of nitrogen to moles of oxygen is approximately 2:3. Therefore, the empirical formula of the compound is N2O3.

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• 5.

### The molar mass for copper(II) sulfate pentahydrate is

• A.

159.6 g/mol

• B.

149.6 g/mol

• C.

259.6 g/mol

• D.

249.6 g/mol

D. 249.6 g/mol
Explanation
The molar mass of copper(II) sulfate pentahydrate can be calculated by adding up the atomic masses of all the elements present in the compound. Copper has an atomic mass of 63.55 g/mol, sulfur has an atomic mass of 32.06 g/mol, oxygen has an atomic mass of 16.00 g/mol, and hydrogen has an atomic mass of 1.01 g/mol. Since there are five water molecules (H2O) in the compound, we need to multiply the atomic mass of water (18.02 g/mol) by 5. Adding up all these atomic masses gives a molar mass of 249.6 g/mol for copper(II) sulfate pentahydrate.

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• 6.

C.
• 7.

### Calculate the number of moles in 8.0 g of sodium hydroxide, NaOH.

• A.

.05

• B.

.10

• C.

.15

• D.

.20

D. .20
Explanation
The correct answer is .20. To calculate the number of moles, we need to use the molar mass of sodium hydroxide. The molar mass of NaOH is 22.99 + 16.00 + 1.01 = 40.00 g/mol. We can use the formula: moles = mass/molar mass. Plugging in the values, we get moles = 8.0 g / 40.00 g/mol = 0.20 mol.

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• 8.

### In the following formula what is the substance that is reduced?

• A.

Al

• B.
• C.
• D.

Cu

D. Cu
Explanation
In the given formula, Cu is the substance that is reduced. Reduction is a chemical reaction in which a substance gains electrons. In this case, Cu is undergoing reduction, meaning it is gaining electrons and being reduced to a lower oxidation state.

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• 9.

### In the following formula what is the substance that is oxidized?

• A.

Al

• B.
• C.
• D.

Cu

C.
Explanation
The substance that is oxidized in the given formula is Al (aluminum).

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• 10.

### In the following formula what is the substance that is reducing agent?

• A.

Al

• B.
• C.
• D.

Cu

A. Al
Explanation
Aluminum (Al) is the substance that acts as a reducing agent in the given formula. A reducing agent is a substance that donates electrons to another substance, causing it to be reduced. In this case, Al is donating electrons to another substance, causing it to be reduced.

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• 11.

### In the following formula what is the substance that is oxidizing agent?

• A.

Al

• B.
• C.
• D.

Cu

B.
Explanation
The substance that is the oxidizing agent in the given formula is Cu.

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• 12.

### What type of reaction is this?

• A.

Synthesis

• B.

Decomposition

• C.

Single replacement

• D.

Double replacement

C. Single replacement
Explanation
A single replacement reaction, also known as a substitution reaction, occurs when one element replaces another element in a compound. In this type of reaction, a more reactive element displaces a less reactive element in a compound, resulting in the formation of a new compound. This can be represented by the general equation A + BC → AC + B, where A is the more reactive element and B is the less reactive element.

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• 13.

### What are the correct coefficients for the following equation?

• A.

2, 4, 4, 2

• B.

1, 2, 3, 1

• C.

1, 2, 2, 1

C. 1, 2, 2, 1
Explanation
The correct coefficients for the equation are 1, 2, 2, 1.

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• 14.

### When the above equation is balanced, what is the coefficient for nickle (III) oxide?

• A.

1

• B.

2

• C.

3

• D.

4

A. 1
Explanation
In a balanced chemical equation, the coefficients represent the number of molecules or atoms of each substance involved in the reaction. In this equation, the coefficient for nickel (III) oxide is 1, indicating that there is only one molecule of nickel (III) oxide involved in the reaction.

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• 15.

### What kind of reaction does the above equation represent?

• A.

Synthesis

• B.

Decomposition

• C.

Single replacement

• D.

Double replacement

D. Double replacement
Explanation
The given equation represents a double replacement reaction. In a double replacement reaction, the cations and anions of two different compounds switch places, resulting in the formation of two new compounds. This process typically occurs when the reactants are in an aqueous solution and precipitates or gases are formed as products.

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• 16.

### What are the reactants in the following equation? H2 + O2 → 2H2O

• A.

Hydrogen

• B.

Oxygen

• C.

Water

• D.

Hydrogen and Oxygen

D. Hydrogen and Oxygen
Explanation
The reactants in the given equation are hydrogen and oxygen.

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• 17.

D.
• 18.

### What is the percent of oxygen in Fe2(SO4)3?

• A.

48%

• B.

31%

• C.

35%

• D.

100%

A. 48%
Explanation
The percent of oxygen in Fe2(SO4)3 can be calculated by finding the molar mass of oxygen in the compound and dividing it by the molar mass of the entire compound. In Fe2(SO4)3, there are 12 oxygen atoms with a molar mass of 16 g/mol each, giving a total mass of 192 g/mol. The molar mass of the entire compound is 399.88 g/mol. Dividing 192 g/mol by 399.88 g/mol and multiplying by 100 gives a result of approximately 48%. Therefore, the correct answer is 48%.

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• 19.

### How many moles are 345 g of Na?

• A.

5.73 mol

• B.

15.0 mol

• C.

7930 mol

• D.

9.03 mol

B. 15.0 mol
Explanation
The molar mass of Na (sodium) is 22.99 g/mol. To find the number of moles, we divide the given mass (345 g) by the molar mass of Na. 345 g / 22.99 g/mol = 15.0 mol. Therefore, 345 g of Na is equal to 15.0 moles.

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• 20.

### Propane, C3H8 (g), burns in oxygen to form carbon dioxide and water.  Which equation correctly shows this reaction?

B.
Explanation
The correct equation for the combustion of propane in oxygen is C3H8 + 5O2 → 3CO2 + 4H2O. This equation shows that one molecule of propane reacts with five molecules of oxygen to produce three molecules of carbon dioxide and four molecules of water.

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• 21.

### In which situation is a chemical reaction occurring?

• A.

Salt dissolving in water

• B.

A nail rusting

• C.

Ice melting

• D.

A glass window breaking

B. A nail rusting
Explanation
A chemical reaction is occurring when a nail rusts. Rusting is a chemical process that involves the reaction of iron with oxygen and water, resulting in the formation of iron oxide. This process is an example of oxidation, where the iron atoms lose electrons and undergo a chemical change. In contrast, salt dissolving in water, ice melting, and a glass window breaking are physical changes rather than chemical reactions.

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• 22.

### Fossil fuels that contain carbon, such as coal, petroleum and natural gas, combine with oxygen to produce carbon dioxide gas and energy often in the form of heat.  These processes are example of which type of reactions?

• A.

Endothermic reactions

• B.

Metabolic reactions

• C.

Replacement reactions

• D.

Exothermic reaction

D. Exothermic reaction
Explanation
Fossil fuels, like coal, petroleum, and natural gas, undergo a reaction with oxygen where they combine to produce carbon dioxide gas and energy, usually in the form of heat. This type of reaction is known as an exothermic reaction because it releases energy in the form of heat.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Feb 12, 2014
Quiz Created by
Andrew Beane