Question 1

Which of the following best describes a combination reaction?

Accepted Answer

Two or more reactants combine to form a single product.

Question 2

What is the correct balanced equation for the reaction between nitrogen gas and hydrogen gas to form ammonia?

Accepted Answer

$$\mathrm{N_2$(g) + 3H_2(g) \rightarrow 2NH_3(g)}$$

Question 3

Which of the following is a correct molecular equation for the reaction of magnesium with sulfuric acid?

Accepted Answer

$$\mathrm{Mg(s) + H_2SO_4(aq) \rightarrow $$MgSO_4$$(aq) + H_2$(g)}$$

Question 4

When sodium chloride dissolves in water, which ions are formed?

Accepted Answer

$$\mathrm{Na^+(aq)}$$ and $$\mathrm{Cl^-(aq)}$$

Question 5

Which of the following reactions is a combustion reaction?

Accepted Answer

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

Question 6

Which of the following is a correct net ionic equation for the reaction of magnesium with hydrochloric acid?

Accepted Answer

$$\mathrm{Mg(s) + 2H^+(aq) \rightarrow Mg$$^{2+}$$(aq) + H_2$(g)}$$

Question 7

A student mixes aqueous solutions of lead(II) nitrate and potassium iodide. What is the precipitate formed?

Accepted Answer

$$\mathrm{$$PbI_2$$(s)}$$

Question 8

Which of the following is a double replacement reaction?

Accepted Answer

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

Question 9

Which of the following ions is a spectator ion in the reaction $$\mathrm{Pb(NO_3$)_2(aq) + 2KI(aq) \rightarrow $$PbI_2$$(s) + 2KNO_3(aq)}$$?

Accepted Answer

$$\mathrm{K^+}$$

Question 10

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can dissolve at a given temperature.

Question 11

Which of the following reactions is a decomposition reaction?

Accepted Answer

$$\mathrm{2NaClO_3(s) \rightarrow 2NaCl(s) + 3O_2(g)}$$

Question 12

Which of the following is the correct dissociation equation for $$\mathrm{$$BaCl_2$$} in $$water?

Accepted Answer

$$\mathrm{$$BaCl_2$$(s) \rightarrow Ba$$^{2+}$$(aq) + 2Cl^-(aq)}$$

Question 13

Which of the following is a correct ionic equation for the reaction of potassium hydroxide and sulfuric acid?

Accepted Answer

$$\mathrm{2K^+(aq) + 2OH^-(aq) + 2H^+(aq) + SO_4$^{2-}(aq) \rightarrow 2K^+(aq) + SO_4$^{2-}(aq) + 2H_2O(l)}$$

Question 14

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

Accepted Answer

Mixing baking soda ($$\mathrm{$$NaHCO_3$$}) $$and vinegar ($$\mathrm{CH_3COOH}) to $$produce $$\mathrm{CO_2$}$$ gas.

Question 15

Which of the following best describes the role of coefficients in balancing chemical equations?

Accepted Answer

Coefficients are used to balance the number of atoms of each element on both sides of the equation.

Question 16

Which of the following reactions is a single replacement reaction?

Accepted Answer

$$\mathrm{Zn(s) + $$CuCl_2$$(aq) \rightarrow $$ZnCl_2$$(aq) + Cu(s)}$$

Question 17

Which of the following is the correct dissociation equation for $$\mathrm{NH_4OH} in $$water?

Accepted Answer

$$\mathrm{NH_4OH \rightarrow NH_4$^+ + OH^-}$$

Question 18

Which of the following is the correct net ionic equation for the neutralization of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Chapter 7: Chemical Reactions – Study Notes

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