Question 1

Which of the following best describes a chemical equation?

Accepted Answer

An expression in which symbols and formulas are used to represent a chemical reaction.

Question 2

In the balanced chemical equation $2\mathrm{NaHCO}_3 \xrightarrow{	ext{Heat}} \mathrm{Na}_2\mathrm{CO}_3 + \mathrm{H}_2\mathrm{O} + \mathrm{CO}_2$, what is the coefficient for water?

Accepted Answer

1

Question 3

Which of the following ions would make a compound probably soluble in water according to the solubility guidelines?

Accepted Answer

$\mathrm{NH}_4^+$

Question 4

A student mixes aqueous solutions of $\mathrm{Na}_2\mathrm{SO}_4$ and $\mathrm{BaCl}_2$. What type of reaction occurs and what is the precipitate formed?

Accepted Answer

Precipitation reaction; $\mathrm{BaSO}_4$

Question 5

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

Accepted Answer

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

Question 6

Which statement about balancing chemical equations is correct?

Accepted Answer

The number of atoms of each element must be the same on both sides of the equation.

Question 7

Which of the following is a redox reaction?

Accepted Answer

$2\mathrm{Na} (s) + 2\mathrm{H}_2\mathrm{O} (l) \rightarrow 2\mathrm{NaOH} (aq) + \mathrm{H}_2 (g)$

Question 8

Which of the following best describes an oxidizing agent?

Accepted Answer

A substance that gains electrons and causes reduction.

Question 9

What is the oxidation number of sulfur in $\mathrm{SO}_4^{2-}$?

Accepted Answer

+6

Question 10

Which of the following is a spectator ion in the reaction $\mathrm{Na}_2\mathrm{SO}_4 (aq) + \mathrm{BaCl}_2 (aq) \rightarrow \mathrm{BaSO}_4 (s) + 2\mathrm{NaCl} (aq)$?

Accepted Answer

$\mathrm{Na}^+$

Question 11

A metal is found to corrode when exposed to air and moisture. Which process is primarily responsible for this corrosion?

Accepted Answer

Redox reaction

Question 12

Which of the following compounds is most likely to be insoluble in water?

Accepted Answer

$\mathrm{BaSO}_4$

Question 13

Which of the following best describes a net ionic equation?

Accepted Answer

An equation that shows only the ions that undergo change during the reaction.

Question 14

Which of the following is the correct oxidation number for oxygen in most compounds?

Accepted Answer

-2

Question 15

In the reaction $2\mathrm{I}^- (aq) + \mathrm{Br}_2 (aq) \rightarrow 2\mathrm{Br}^- (aq) + \mathrm{I}_2 (aq)$, which species is oxidized?

Accepted Answer

$\mathrm{I}^-$

Question 16

Which of the following is a correct generalization about redox behavior in the periodic table?

Accepted Answer

Metals tend to lose electrons and nonmetals tend to gain electrons.

Question 17

Which of the following is a real-world example of a redox reaction?

Accepted Answer

Rusting of iron in bridges and buildings.

Question 18

Which of the following is true about acid-base neutralization reactions?

Accepted Answer

They produce water and a salt.

Question 19

What is the oxidation number of chlorine in $\mathrm{NaCl}$?

Accepted Answer

-1

Question 20

Which of the following is the correct balanced equation for the acid-base neutralization between $\mathrm{HCl}$ and $\mathrm{NaOH}$?

Accepted Answer

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

Chemical Equations, Reactions, and Redox Processes: GOB Chemistry Study Notes

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