Question 1

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which one or more substances are converted into one or more different substances.

Question 2

Which of the following is the correct balanced chemical equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$(g) + 2\ O_2$(g) \rightarrow CO_2$(g) + 2\ H_2O(g)}$$

Question 3

Which of the following compounds is a strong electrolyte when dissolved in water?

Accepted Answer

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

Question 4

According to the solubility rules, which of the following compounds is insoluble in water?

Accepted Answer

$$\mathrm{AgCl}$$

Question 5

What is the net ionic equation for the reaction between aqueous solutions of sodium sulfate and barium chloride?

Accepted Answer

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

Question 6

Which of the following is a correct example of a redox reaction?

Accepted Answer

$$\mathrm{2Mg(s) + O_2$(g) \rightarrow 2MgO(s)}$$

Question 7

Assign the oxidation state to sulfur in $$\mathrm{SO_2$}.$$

Accepted Answer

$$+4$$

Question 8

Which of the following best describes a limiting reactant in a chemical reaction?

Accepted Answer

The reactant that determines the maximum amount of product that can be formed.

Question 9

How many moles of $$\mathrm{CO_2$}$$ are produced from the complete combustion of 2.00 moles of $$\mathrm{C_2H_5OH}$$ according to the equation: $$\mathrm{C_2H_5OH} + 3O_2 \rightarrow 2CO_2 + 3H_2O$$?

Accepted Answer

$$4.00$$ moles

Question 10

A solution is prepared by dissolving 0.500 mol of NaCl in enough water to make 1.75 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.286\ \mathrm{mol\ L$$^{-1}$$}$$

Question 11

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

Accepted Answer

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

Question 12

A student mixes 50.0 mL of 0.200 M $$\mathrm{$$AgNO_3$$}$$ with 50.0 mL of 0.200 M $$\mathrm{NaCl}. $$What mass of $$\mathrm{AgCl} ($$molar mass = 143.32 g/mol) will precipitate?

Accepted Answer

$$0.716 g$$

Question 13

Which of the following statements about electrolytes is correct?

Accepted Answer

A strong electrolyte completely dissociates into ions in water.

Question 14

What is the percent yield if the theoretical yield of a reaction is 70.5 g and the actual yield is 55.0 g?

Accepted Answer

$$79.3\%$$

Question 15

Which of the following is a gas-evolution reaction that forms a gas directly as a product?

Accepted Answer

$$\mathrm{2HCl(aq) + K_2S(aq) \rightarrow 2KCl(aq) + H_2S(g)}$$

Question 16

Which of the following best describes a disproportionation reaction?

Accepted Answer

A reaction in which an element is both oxidized and reduced.

Question 17

How many grams of $$\mathrm{MgO} ($$molar mass = 40.31 g/mol) can be formed from 42.5 g of Mg (molar mass = 24.31 g/mol) and 33.8 g of $$\mathrm{O_2$} ($$molar mass = 32.00 g/mol) according to the equation: $$\mathrm{2Mg + O_2$ \rightarrow 2MgO}$$?

Accepted Answer

$$70.3 g$$

Question 18

What volume (in mL) of 0.250 M $$\mathrm{$$HNO_3$$} is $$required to completely react with 50.0 mL of 0.108 M $$\mathrm{Na_2CO_3}$$ according to the equation: $$\mathrm{Na_2CO_3(aq) + 2HNO_3(aq) \rightarrow 2NaNO_3(aq) + CO_2$(g) + H_2O(l)}$$?

Accepted Answer

$$43.2 mL$$

Question 19

Which of the following is the correct net ionic equation for the precipitation reaction between aqueous solutions of copper(II) sulfate and sodium hydroxide?

Accepted Answer

$$\mathrm{Cu$$^{2+}$$(aq) + 2OH^-(aq) \rightarrow Cu(OH)_2(s)}$$

Chapter 4: Chemical Reactions and Stoichiometry – Chemistry of Cuisine

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