Question 1

Which of the following observations provides evidence that a chemical reaction has occurred?

Accepted Answer

Formation of a solid in a previously clear solution

Question 2

In the classic grade school volcano experiment, baking soda ($$\mathrm{$$NaHCO_3$$}) $$reacts with acetic acid to produce which gas?

Accepted Answer

Carbon dioxide ($$\mathrm{CO_2$})$$

Question 3

Which of the following is a balanced chemical equation for the combustion of octane ($$\mathrm{C_8H_{18}}) in $$air?

Accepted Answer

$$2\mathrm{C_8H_{18}}(l) + 25\mathrm{O_2$}(g) \rightarrow 16\mathrm{CO_2$}(g) + 18\mathrm{H_2O}(g)$$

Question 4

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms when two aqueous solutions are mixed

Question 5

Which compound is insoluble in water according to the solubility rules?

Accepted Answer

$$\mathrm{AgBr}$$

Question 6

What is the net ionic equation for the reaction between $$\mathrm{$$AgNO_3$$}(aq)$$ and $$\mathrm{NaCl}(aq)$$?

Accepted Answer

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

Question 7

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl}$$

Question 8

Which of the following reactions is a redox reaction?

Accepted Answer

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$

Question 9

Assign the oxidation state to carbon in $$\mathrm{CO_2$}.$$

Accepted Answer

+4

Question 10

Which of the following is the correct balanced equation for the reaction of calcium carbide ($$\mathrm{$$CaC_2$$}) $$with water?

Accepted Answer

$$\mathrm{$$CaC_2$$(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + C_2H_2(g)}$$

Question 11

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

Accepted Answer

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

Question 12

What is the product of the reaction between $$\mathrm{K_2CO_3(aq)}$$ and $$\mathrm{$$NiCl_2$$(aq)}$$?

Accepted Answer

$$\mathrm{$$NiCO_3$$(s)}$$

Question 13

Which of the following is a double-displacement reaction?

Accepted Answer

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

Question 14

Which of the following reactions will produce a gas as one of its products?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + 2HNO_3(aq) \rightarrow 2NaNO_3(aq) + CO_2$(g) + H_2O(l)}$$

Question 15

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{Pb(NO_3$)_2(aq)}$$ and $$\mathrm{2KCl(aq)}$$?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2Cl^-(aq) \rightarrow $$PbCl_2$$(s)}$$

Question 16

Which of the following is a synthesis (combination) reaction?

Accepted Answer

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$

Question 17

Which of the following is the correct molecular equation for the reaction between $$\mathrm{$$HClO_4$$(aq)}$$ and $$\mathrm{NaOH(aq)}$$?

Accepted Answer

$$\mathrm{$$HClO_4$$(aq) + NaOH(aq) \rightarrow H_2O(l) + $$NaClO_4$$(aq)}$$

Question 18

Which of the following is the correct net ionic equation for the reaction between $$\mathrm{H_2SO_4(aq)}$$ and $$\mathrm{Sr(OH)_2(aq)}$$?

Accepted Answer

$$\mathrm{Sr$$^{2+}$$(aq) + SO_4$^{2-}(aq) \rightarrow $$SrSO_4$$(s)}$$

Introduction to Chemical Reactions: Evidence and Applications

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