Question 1

Which of the following best represents the balanced chemical equation for the combustion of cyclohexane ($$\mathrm{C_6H_{12}}) in $$oxygen?

Accepted Answer

$$\mathrm{C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O}$$

Question 2

Given the reaction $$2\mathrm{C_6H_{12}} + 17\mathrm{O_2$} \rightarrow 12\mathrm{CO_2$} + 12\mathrm{H_2O}$$, how many moles of $$\mathrm{O_2$}$$ are required to completely combust 5 moles of $$\mathrm{C_6H_{12}}$$?

Accepted Answer

42.5 moles

Question 3

In the reaction $$2\mathrm{Ag}^+ + \mathrm{Cu} \rightarrow \mathrm{Cu}^{2+} + 2\mathrm{Ag}$$, which species is oxidized?

Accepted Answer

$$\mathrm{Cu}$$

Question 4

Which of the following is the correct net ionic equation for the reaction between silver ion and copper metal?

Accepted Answer

$$2\mathrm{Ag}^+ (aq) + \mathrm{Cu} (s) \rightarrow 2\mathrm{Ag} (s) + \mathrm{Cu}^{2+} (aq)$$

Question 5

Balance the following equation for the combustion of cyclohexane: $$\mathrm{C_6H_{12} + O_2$ \rightarrow CO_2$ + H_2O}. $$What is the coefficient for $$\mathrm{O_2$}$$?

Accepted Answer

9

Question 6

A reaction is given: $$5\mathrm{O_2$} (g) + 2\mathrm{I_2$} (g) \rightarrow 2\mathrm{K_2O_5} (s) + 4\mathrm{$$KNO_3$$} (s). If $$you start with 10 moles of $$\mathrm{O_2$}$$ and excess $$\mathrm{I_2$}$$, how many moles of $$\mathrm{$$KNO_3$$}$$ can be formed?

Accepted Answer

8 moles

Question 7

In the reaction $$2\mathrm{C_6H_{12}} + 17\mathrm{O_2$} \rightarrow 12\mathrm{CO_2$} + 12\mathrm{H_2O}$$, what is the limiting reactant if you have 3 moles of $$\mathrm{C_6H_{12}}$$ and 20 moles of $$\mathrm{O_2$}$$?

Accepted Answer

$$\mathrm{O_2$}$$

Question 8

Which of the following best describes what happens to copper in the reaction $$2\mathrm{Ag}^+ + \mathrm{Cu} \rightarrow \mathrm{Cu}^{2+} + 2\mathrm{Ag}$$?

Accepted Answer

Copper is oxidized and acts as a reducing agent.

Question 9

If 1 mole of $$\mathrm{C_6H_{12}} is $$combusted, how many moles of $$\mathrm{CO_2$}$$ are produced according to the balanced equation $$\mathrm{C_6H_{12} + 9O_2 \rightarrow 6CO_2 + 6H_2O}$$?

Accepted Answer

6 moles

Question 10

Which of the following statements is true about the reaction $$2\mathrm{Ag}^+ + \mathrm{Cu} \rightarrow \mathrm{Cu}^{2+} + 2\mathrm{Ag}$$?

Accepted Answer

$$\mathrm{Ag}^+ is $$reduced to $$\mathrm{Ag}.$$

Question 11

A student claims that the equation $$\mathrm{C_6H_{12} + 6O_2 \rightarrow 6CO_2 + 6H_2O} is $$balanced. Which of the following best explains why this is incorrect?

Accepted Answer

The number of oxygen atoms is not balanced on both sides.

Question 12

In the reaction $$5\mathrm{O_2$} (g) + 2\mathrm{I_2$} (g) \rightarrow 2\mathrm{K_2O_5} (s) + 4\mathrm{$$KNO_3$$} (s)$$, what is the mole ratio of $$\mathrm{O_2$} to$$ $$\mathrm{$$KNO_3$$}$$?

Accepted Answer

5:4

Question 13

Which of the following is a redox reaction?

Accepted Answer

$$2\mathrm{Ag}^+ + \mathrm{Cu} \rightarrow \mathrm{Cu}^{2+} + 2\mathrm{Ag}$$

Question 14

If 2 moles of $$\mathrm{C_6H_{12}}$$ react with 20 moles of $$\mathrm{O_2$}$$, how many moles of $$\mathrm{CO_2$}$$ are produced according to $$2\mathrm{C_6H_{12}} + 17\mathrm{O_2$} \rightarrow 12\mathrm{CO_2$} + 12\mathrm{H_2O}$$?

Accepted Answer

12 moles

Question 15

Which of the following best describes the role of $$\mathrm{Ag}^+ in $$the reaction $$2\mathrm{Ag}^+ + \mathrm{Cu} \rightarrow \mathrm{Cu}^{2+} + 2\mathrm{Ag}$$?

Accepted Answer

$$\mathrm{Ag}^+ is $$the oxidizing agent.

General Chemistry: Chemical Equations, Balancing, and Redox Reactions

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