Question 1

Which of the following is the correctly balanced equation for the combustion of propane ($$\mathrm{C_3H_8}) in $$oxygen?

Accepted Answer

$$\mathrm{C_3H_8} + 5\mathrm{O_2$} \rightarrow 3\mathrm{CO_2$} + 4\mathrm{H_2O}$$

Question 2

Which type of reaction is represented by the following equation? $$\mathrm{2KClO_3 \rightarrow 2KCl + 3O_2}$$

Accepted Answer

Decomposition

Question 3

Which of the following reactions will actually occur when solutions of $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$ are mixed?

Accepted Answer

$$\mathrm{$$AgNO_3$$ (aq) + NaCl (aq) \rightarrow AgCl (s) + $$NaNO_3$$ (aq)}$$

Question 4

Which species is oxidized in the following reaction? $$\mathrm{Zn (s) + $$CuSO_4$$ (aq) \rightarrow $$ZnSO_4$$ (aq) + Cu (s)}$$

Accepted Answer

$$\mathrm{Zn}$$

Question 5

What is the correct formula for the product formed when magnesium reacts with hydrochloric acid?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 6

Given the reaction $$\mathrm{2Al + 3CuSO_4 \rightarrow Al_2$(SO_4$)_3 + 3Cu}$$, how many moles of $$\mathrm{Cu}$$ are produced from 4 moles of $$\mathrm{Al}$$?

Accepted Answer

6 moles

Question 7

Which of the following best represents the particle-level diagram for the reaction $$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$?

Accepted Answer

Two $$\mathrm{H_2$}$$ molecules and one $$\mathrm{O_2$}$$ molecule combine to form two $$\mathrm{H_2O}$$ molecules.

Question 8

What is the empirical formula for a compound containing 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 9

A reaction produces 8.0 g of product when the theoretical yield is 10.0 g. What is the percent yield?

Accepted Answer

$$80\%$$

Question 10

How many liters of $$\mathrm{CO_2$}$$ gas at STP are produced from the complete combustion of 44 g of propane ($$\mathrm{C_3H_8}$$)? (Molar mass of $$\mathrm{C_3H_8} = 44 g/$$mol)

Accepted Answer

$$67.2 L$$

Question 11

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{NaOH}$$ and $$\mathrm{HCl}$$?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 12

A solution contains 0.5 mol of $$\mathrm{Na_2SO_4} in 1.0 L of $$water. What is the concentration of $$\mathrm{SO_4$^{2-}}$$ ions?

Accepted Answer

$$0.5 M$$

Question 13

If 2.0 mol of $$\mathrm{H_2$}$$ react with 1.0 mol of $$\mathrm{O_2$} to $$form water, which reactant is limiting?

Accepted Answer

$$\mathrm{O_2$}$$

Question 14

Which of the following best describes a redox reaction?

Accepted Answer

A reaction in which electrons are transferred between species

Question 15

What is the oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

+6

Question 16

Which of the following is a double displacement reaction?

Accepted Answer

$$\mathrm{$$BaCl_2$$ (aq) + Na_2SO_4 (aq) \rightarrow $$BaSO_4$$ (s) + 2NaCl (aq)}$$

Question 17

A sample of $$\mathrm{$$CaCO_3$$} is $$heated and decomposes according to $$\mathrm{$$CaCO_3$$ (s) \rightarrow CaO (s) + CO_2$ (g)}. If 10.0 g of$$ $$\mathrm{$$CaCO_3$$} is $$used, how many grams of $$\mathrm{CO_2$}$$ are produced? (Molar mass $$\mathrm{$$CaCO_3$$} = 100 g/$$mol, $$\mathrm{CO_2$} = 44 g/$$mol)

Accepted Answer

4.4 g

Question 18

Which of the following statements about limiting reactants is correct?

Accepted Answer

The limiting reactant is completely consumed in the reaction.

Question 19

In a reaction, 5.0 g of $$\mathrm{H_2$}$$ reacts with 40.0 g of $$\mathrm{O_2$} to $$form water. Which reactant is in excess? (Molar mass: $$\mathrm{H_2$} = 2 g/$$mol, $$\mathrm{O_2$} = 32 g/$$mol)

Accepted Answer

$$\mathrm{O_2$}$$

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