Q: Which of the following is the correct balanced equation for the reaction of nitrogen gas with oxygen gas to produce nitrogen dioxide gas?

$$\text{N}_2(g) + 2 \text{O}_2(g) \rightarrow 2 \text{NO}_2(g)$$

Q: Aqueous solutions of lead(II) nitrate and sodium chloride are mixed. Which of the following best describes the type of reaction and the precipitate formed?

Double displacement; lead(II) chloride ($$\text{PbCl}_2) $$precipitate

Q: Which of the following is the correct balanced equation for the combustion of propane ($$\text{C}_3\text{H}_8$$)?

$$\text{C}_3\text{H}_8(g) + 5 \text{O}_2(g) \rightarrow 3 \text{CO}_2(g) + 4 \text{H}_2\text{O}(g)$$

Q: A strip of zinc metal (2.00 g) is placed in an aqueous solution containing 2.50 g of silver nitrate. Zinc displaces silver to form zinc nitrate. Which reactant is limiting? (Molar masses: Zn = 65.4 g/mol, AgNO$$_3 = 170 g/$$mol)

Silver nitrate ($$\text{AgNO}_3)$$

Q: Which of the following is a correct example of a double displacement reaction?

$$2 \text{KI}(aq) + \text{Pb(NO}_3)_2(aq) \rightarrow 2 \text{KNO}_3(aq) + \text{PbI}_2(s)$$

Q: Which of the following best represents an acid-base neutralization reaction?

$$\text{HCl}(aq) + \text{NaOH}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)$$

Q: Which of the following is the correct formula for calculating percent yield?

$$\frac{\text{Actual Yield (moles)}}{\text{Theoretical Yield (moles)}} \times 100\%$$

Question 1

Which of the following best describes the role of the arrow ($$\rightarrow) in a $$chemical equation?

Accepted Answer

It separates the products from the reactants.

Question 2

Given the reaction: $$2 	ext{Na}(s) + 	ext{Cl}_2(g) ightarrow 2 	ext{NaCl}(s)$$, what type of reaction is this?

Accepted Answer

Combination (Synthesis)

Question 3

Balance the following equation for the combustion of heptane: $$	ext{C}_7	ext{H}_{16}(l) + \_\_\_ 	ext{O}_2(g) ightarrow \_\_\_ 	ext{CO}_2(g) + \_\_\_ 	ext{H}_2	ext{O}(g). $$What are the correct coefficients (in order: O2, CO2, H2O)?

Accepted Answer

$$11, 7, 8$$

Question 4

Which of the following is the correct balanced equation for the reaction of nitrogen gas with oxygen gas to produce nitrogen dioxide gas?

Accepted Answer

$$	ext{N}_2(g) + 2 	ext{O}_2(g) ightarrow 2 	ext{NO}_2(g)$$

Question 5

Aqueous solutions of lead(II) nitrate and sodium chloride are mixed. Which of the following best describes the type of reaction and the precipitate formed?

Accepted Answer

Double displacement; lead(II) chloride ($$	ext{PbCl}_2) $$precipitate

Question 6

Which of the following is the correct balanced equation for the combustion of propane ($$	ext{C}_3	ext{H}_8$$)?

Accepted Answer

$$	ext{C}_3	ext{H}_8(g) + 5 	ext{O}_2(g) ightarrow 3 	ext{CO}_2(g) + 4 	ext{H}_2	ext{O}(g)$$

Question 7

If 3.5 moles of propane ($$	ext{C}_3	ext{H}_8) $$are combusted, how many moles of oxygen ($$	ext{O}_2) $$are required?

Accepted Answer

$$17.5$$ moles

Question 8

In the reaction $$	ext{C}_3	ext{H}_8(g) + 5 	ext{O}_2(g) ightarrow 3 	ext{CO}_2(g) + 4 	ext{H}_2	ext{O}(g)$$, how many grams of water are produced when 200 g of propane are burned? (Molar masses: $$	ext{C}_3	ext{H}_8 = 44 g/$$mol, $$	ext{H}_2	ext{O} = 18 g/$$mol)

Accepted Answer

$$327 g$$

Question 9

A strip of zinc metal (2.00 g) is placed in an aqueous solution containing 2.50 g of silver nitrate. Zinc displaces silver to form zinc nitrate. Which reactant is limiting? (Molar masses: Zn = 65.4 g/mol, AgNO$$_3 = 170 g/$$mol)

Accepted Answer

Silver nitrate ($$	ext{AgNO}_3)$$

Question 10

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that is completely consumed and limits the amount of product formed.

Question 11

If the actual yield of a reaction is 100 g and the theoretical yield is 150 g, what is the percent yield?

Accepted Answer

$$66.7\%$$

Question 12

Which of the following is a correct example of a double displacement reaction?

Accepted Answer

$$2 	ext{KI}(aq) + 	ext{Pb(NO}_3)_2(aq) ightarrow 2 	ext{KNO}_3(aq) + 	ext{PbI}_2(s)$$

Question 13

Which of the following best represents an acid-base neutralization reaction?

Accepted Answer

$$	ext{HCl}(aq) + 	ext{NaOH}(aq) ightarrow 	ext{NaCl}(aq) + 	ext{H}_2	ext{O}(l)$$

Question 14

If 100 g of hydrogen gas reacts with 100 g of oxygen gas, how many grams of water are produced? (Molar masses: H$$_2 = 2 g/$$mol, O$$_2 = 32 g/$$mol, H$$_2O = 18 g/$$mol)

Accepted Answer

$$112.5 g$$

Question 15

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$$\frac{	ext{Actual Yield (moles)}}{	ext{Theoretical Yield (moles)}} 	imes 100\%$$

Question 16

Solid sodium hydroxide decomposes into solid sodium oxide and gaseous water. What type of reaction is this?

Accepted Answer

Decomposition

Question 17

If 350 g of water are needed, how much propane ($$	ext{C}_3	ext{H}_8) $$should be burned (in grams)? (Molar masses: $$	ext{C}_3	ext{H}_8 = 44 g/$$mol, $$	ext{H}_2	ext{O} = 18 g/$$mol)

Accepted Answer

$$235 g$

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