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

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

Q: Which of the following reactions is a precipitation reaction?

$$\text{AgNO}_3 (aq) + \text{NaCl} (aq) \rightarrow \text{AgCl} (s) + \text{NaNO}_3 (aq)$$

Q: Which of the following is the correct net ionic equation for the reaction between $$\text{AgNO}_3 (aq)$$ and $$\text{NaCl} (aq)$$?

$$\text{Ag}^+ (aq) + \text{Cl}^- (aq) \rightarrow \text{AgCl} (s)$$

Q: Which of the following reactions is a decomposition reaction?

$$2\text{H}_2\text{O}_2 (aq) \rightarrow 2\text{H}_2\text{O} (l) + \text{O}_2 (g)$$

Question 1

Which of the following is NOT an observable evidence of a chemical reaction?

Accepted Answer

A liquid evaporates when left in an open container.

Question 2

Which of the following best describes what happens at the molecular level during a chemical reaction?

Accepted Answer

Bonds are broken and new bonds are formed.

Question 3

Given the reaction: $$2 	ext{H}_2 (g) + 	ext{O}_2 (g) ightarrow 2 	ext{H}_2	ext{O} (g)$$, how many grams of water vapor will form if 2.0 g of hydrogen gas reacts with 16.0 g of oxygen gas?

Accepted Answer

18.0 g

Question 4

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

Accepted Answer

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

Question 5

According to solubility rules, which of the following compounds is insoluble in water?

Accepted Answer

$$	ext{AgCl}$$

Question 6

Which of the following reactions is a precipitation reaction?

Accepted Answer

$$	ext{AgNO}_3 (aq) + 	ext{NaCl} (aq) ightarrow 	ext{AgCl} (s) + 	ext{NaNO}_3 (aq)$$

Question 7

Which of the following best describes a redox reaction?

Accepted Answer

A reaction involving the transfer of electrons between reactants.

Question 8

Which element is being reduced in the following reaction? $$	ext{Cr}_2	ext{O}_7$$^{2-}$$ + 6	ext{Fe}^{2+} + 14	ext{H}^+ ightarrow 2	ext{Cr}^{3+} + 6	ext{Fe}^{3+} + 7	ext{H}_2	ext{O}$$

Accepted Answer

Chromium

Question 9

Which of the following compounds contains oxygen with the lowest oxidation state?

Accepted Answer

$$	ext{H}_2	ext{O}_2$$

Question 10

Which of the following statements is TRUE for a voltaic (galvanic) cell, but FALSE for an electrolytic cell?

Accepted Answer

The flow of electrons is spontaneous.

Question 11

Which of the following metals will react spontaneously with $$	ext{Cu}^{2+}$$ ions in solution, based on the activity series?

Accepted Answer

Zn

Question 12

What is the oxidation number of carbon in acetic acid, $$	ext{CH}_3	ext{CO}_2	ext{H}$$?

Accepted Answer

0 and +3

Question 13

Which of the following is the correct net ionic equation for the reaction between $$	ext{AgNO}_3 (aq)$$ and $$	ext{NaCl} (aq)$$?

Accepted Answer

$$	ext{Ag}^+ (aq) + 	ext{Cl}^- (aq) ightarrow 	ext{AgCl} (s)$$

Question 14

Which of the following best describes the function of a salt bridge in a galvanic cell?

Accepted Answer

It allows ions to flow between half-cells to maintain electrical neutrality.

Question 15

Which of the following reactions is a decomposition reaction?

Accepted Answer

$$2	ext{H}_2	ext{O}_2 (aq) ightarrow 2	ext{H}_2	ext{O} (l) + 	ext{O}_2 (g)$$

Question 16

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 17

Which of the following is the correct balanced equation for the reaction of $$	ext{Fe}^{2+}$$ with $$	ext{Cr}_2	ext{O}_7$$^{2-}$$ in acidic solution?

Accepted Answer

$$6	ext{Fe}^{2+} + 	ext{Cr}_2	ext{O}_7$$^{2-}$$ + 14	ext{H}^+ ightarrow 6	ext{Fe}^{3+} + 2	ext{Cr}^{3+} + 7	ext{H}_2	ext{O}$$

Question 18

Which of the following statements is TRUE regarding the anode in a galvanic cell?

Accepted Answer

It is where oxidation occurs.

Question 19

Which of the following best describes the role of the oxidizing agent in a redox reaction?

Accepted Answer

It gains electrons and is reduced.

Classification & Balancing of Chemical Reactions: GOB Chemistry Study Guide

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