Question 1

Which of the following best describes the type of reaction shown in the first image, where hydrogen and oxygen molecules combine to form water molecules?

Accepted Answer

Combination (synthesis) reaction

Question 2

In the image showing a yellow solid forming when two clear solutions are mixed, what type of chemical reaction is occurring?

Accepted Answer

Precipitation reaction

Question 3

A student mixes aqueous solutions of potassium iodide and lead(II) nitrate, resulting in a yellow precipitate. Which compound is the precipitate?

Accepted Answer

$$\mathrm{$$PbI_2$$}$$

Question 4

Which of the following is evidence that a chemical reaction has occurred, as seen in the provided images?

Accepted Answer

Formation of a solid, color change, or gas evolution

Question 5

Refer to the solubility rules table. Which of the following compounds is insoluble in water?

Accepted Answer

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

Question 6

Which of the following best explains why a solution of sodium chloride conducts electricity, as suggested by the 'electrolytes' image?

Accepted Answer

Sodium chloride dissociates into ions in water

Question 7

Which of the following is the correct balanced molecular equation for the reaction between aqueous sodium iodide and silver nitrate?

Accepted Answer

$$\mathrm{NaI(aq) + $$AgNO_3$$(aq) \rightarrow $$NaNO_3$$(aq) + AgI(s)}$$

Question 8

Which of the following is a strong electrolyte?

Accepted Answer

$$\mathrm{NaCl} ($$sodium chloride)

Question 9

A student observes bubbles forming when a metal is placed in an acid solution. Which type of reaction is most likely occurring?

Accepted Answer

Gas-evolution reaction

Question 10

Which of the following net ionic equations represents the formation of a precipitate when solutions of $$\mathrm{Na_2CO_3}$$ and $$\mathrm{$$CaCl_2$$}$$ are mixed?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$(aq) + CO_3$^{2-}(aq) \rightarrow $$CaCO_3$$(s)}$$

Question 11

Which of the following best describes the process of dissociation for an ionic compound in water, as shown in the hydration image?

Accepted Answer

Ionic compounds break apart into their constituent ions, which are surrounded by water molecules

Question 12

Which of the following reactions is a redox (oxidation-reduction) reaction?

Accepted Answer

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

Question 13

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

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

Question 14

A reaction produces a gas when an acid is added to a carbonate. What is the intermediate product and the final gas evolved?

Accepted Answer

Intermediate: $$\mathrm{H_2CO_3}$$, Gas: $$\mathrm{CO_2$}$$

Question 15

Which of the following best describes a double-displacement reaction?

Accepted Answer

$$\mathrm{AB + CD \rightarrow AD + CB}$$

Question 16

Which of the following is a correct balanced equation for the combustion of propane ($$\mathrm{C_3H_8}$$)?

Accepted Answer

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

Question 17

Which of the following statements about spectator ions is correct?

Accepted Answer

Spectator ions remain unchanged and are present on both sides of the complete ionic equation

Question 18

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 19

Which of the following best describes the reaction type for the decomposition of hydrogen peroxide ($$\mathrm{2H_2O_2(aq) \rightarrow 2H_2O(l) + O_2$(g)}$$)?

Accepted Answer

Decomposition reaction

Chapter 7: Chemical Reactions – Study Guide and Key Concepts

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