Question 1

Which of the following statements about balancing chemical equations is CORRECT?

Accepted Answer

Only the coefficients in front of compounds may be adjusted when balancing equations.

Question 2

Consider the combustion of propane: $$\mathrm{C_3H_8 (g) + 5 O_2$ (g) \rightarrow 3 CO_2$ (g) + 4 H_2O (l)}. $$What is the coefficient for water when the equation is balanced?

Accepted Answer

$$4$$

Question 3

Which of the following is classified as a strong electrolyte in aqueous solution?

Accepted Answer

$$\mathrm{HCl} ($$hydrochloric acid)

Question 4

A solution of $$\mathrm{NaCl} in $$water conducts electricity because:

Accepted Answer

Sodium chloride forms ions in water.

Question 5

Which compound is expected to be insoluble in water?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 6

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms from the mixing of two solutions.

Question 7

What is the net ionic equation for the reaction between $$\mathrm{HCl (aq)}$$ and $$\mathrm{NaOH (aq)}$$?

Accepted Answer

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

Question 8

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{CH_3COOH} ($$acetic acid)

Question 9

Which statement is TRUE regarding the solubility of ionic compounds?

Accepted Answer

Some ionic compounds are insoluble or only slightly soluble in water.

Question 10

When $$\mathrm{NH_3$}$$ dissolves in water, what ions are formed?

Accepted Answer

$$\mathrm{NH_4$^+}$$ and $$\mathrm{OH^-}$$

Question 11

Which of the following is NOT a type of chemical reaction discussed in the materials?

Accepted Answer

Combustion

Question 12

In the complete ionic equation for $$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$, which ions are considered spectator ions?

Accepted Answer

$$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$

Question 13

Which of the following compounds is a nonelectrolyte?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} ($$glucose)

Question 14

A student mixes $$\mathrm{$$AgNO_3$$ (aq)}$$ and $$\mathrm{NaCl (aq)}$$ and observes a white solid forming. What is the identity of the precipitate?

Accepted Answer

$$\mathrm{AgCl}$$

Question 15

Which of the following is TRUE about strong electrolytes?

Accepted Answer

They completely dissociate into ions in solution.

Question 16

Which of the following best describes a metathesis (double displacement) reaction?

Accepted Answer

A reaction in which two compounds exchange ions to form new compounds.

Question 17

Which of the following is a correct net ionic equation for the reaction between $$\mathrm{K_2SO_4 (aq)}$$ and $$\mathrm{Ba(NO_3$)_2 (aq)}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$ (aq) + SO_4$^{2-} (aq) \rightarrow $$BaSO_4$$ (s)}$$

Question 18

Which of the following is a common misconception about solubility and electrolytes?

Accepted Answer

All soluble substances are strong electrolytes.

Question 19

Which of the following is the correct molecular equation for the reaction between $$\mathrm{KBr (aq)}$$ and $$\mathrm{$$AgNO_3$$ (aq)}$$?

Accepted Answer

$$\mathrm{KBr (aq) + $$AgNO_3$$ (aq) \rightarrow AgBr (s) + $$KNO_3$$ (aq)}$$

CH4-1: Chemical Reactions and Stoichiometry: Solutions, Electrolytes, and Precipitation

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