Question 1

A student heats a sample of copper(II) sulfate pentahydrate, $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}$$, until it turns white. Which type of reaction has occurred, and what is the correct balanced equation for this process?

Accepted Answer

Decomposition; $$\mathrm{$$CuSO_4$$ \cdot 5H_2O \rightarrow $$CuSO_4$$ + 5H_2O}$$

Question 2

Which of the following best describes a double replacement reaction?

Accepted Answer

Two compounds exchange ions to form two new compounds.

Question 3

Given the unbalanced equation: $$\mathrm{C_3H_8 + O_2$ \rightarrow CO_2$ + H_2O}$$, what are the correct coefficients to balance the combustion reaction?

Accepted Answer

$$\mathrm{1, 5, 3, 4}$$

Question 4

Which of the following reactions will NOT occur based on the activity series of metals?

Accepted Answer

$$\mathrm{Ag(s) + HCl(aq) \rightarrow AgCl(s) + H_2$(g)}$$

Question 5

A hydrate of magnesium sulfate has a mass of 12.0 g before heating and 6.0 g after heating. What is the formula of the hydrate?

Accepted Answer

$$\mathrm{$$MgSO_4$$ \cdot 5H_2O}$$

Question 6

Which of the following is the correct balanced equation for the reaction between aqueous sodium sulfate and barium chloride?

Accepted Answer

$$\mathrm{Na_2SO_4(aq) + $$BaCl_2$$(aq) \rightarrow 2NaCl(aq) + $$BaSO_4$$(s)}$$

Question 7

Which of the following best describes the products of a combustion reaction involving a hydrocarbon?

Accepted Answer

Carbon dioxide and water

Question 8

A student mixes solutions of lead(II) nitrate and potassium iodide. A yellow precipitate forms. What type of reaction is this, and what is the precipitate?

Accepted Answer

Double replacement; $$\mathrm{$$PbI_2$$}$$

Question 9

Which of the following word equations is correctly balanced?

Accepted Answer

2 Hydrogen + 1 Oxygen $$\rightarrow 2 $$Water

Question 10

Which of the following is the correct net ionic equation for the reaction between aqueous silver nitrate and sodium chloride?

Accepted Answer

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

Question 11

Which of the following reactions is an example of a synthesis reaction?

Accepted Answer

$$\mathrm{2H_2(g) + O_2$(g) \rightarrow 2H_2O(g)}$$

Question 12

A student writes the following equation: $$\mathrm{Al(s) + $$CuSO_4$$(aq) \rightarrow Al_2$(SO_4$)_3(aq) + Cu(s)}. $$What is the correct way to balance this equation?

Accepted Answer

$$\mathrm{2Al(s) + 3CuSO_4(aq) \rightarrow Al_2$(SO_4$)_3(aq) + 3Cu(s)}$$

Question 13

Which of the following best explains why sodium reacts vigorously with water, but copper does not?

Accepted Answer

Sodium is higher than copper in the activity series.

Question 14

Which of the following is the correct balanced equation for the combustion of ethanol ($$\mathrm{C_2H_5OH}$$)?

Accepted Answer

$$\mathrm{C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O}$$

Question 15

A student observes that when calcium chloride is added to sodium carbonate solution, a white precipitate forms. What is the identity of the precipitate?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 16

Which of the following is a correct prediction for the products of the reaction: $$\mathrm{Fe(s) + $$CuSO_4$$(aq) \rightarrow}$$ ?

Accepted Answer

$$\mathrm{$$FeSO_4$$(aq) + Cu(s)}$$

Question 17

Which of the following is the correct balanced equation for the decomposition of potassium chlorate?

Accepted Answer

$$\mathrm{2KClO_3(s) \rightarrow 2KCl(s) + 3O_2(g)}$$

Question 18

Which of the following is a correct example of a single replacement reaction?

Accepted Answer

$$\mathrm{Zn(s) + 2HCl(aq) \rightarrow $$ZnCl_2$$(aq) + H_2$(g)}$$

Question 19

A student writes the following word equation: 'Calcium reacts with water to produce calcium hydroxide and hydrogen gas.' What is the correct balanced chemical equation?

Accepted Answer

$$\mathrm{Ca(s) + 2H_2O(l) \rightarrow Ca(OH)_2(aq) + H_2$(g)}$$

Chemical Reactions: Review and Practice Guide

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