$$2\text{Na} (s) + 2\text{HCl} (aq) \rightarrow 2\text{NaCl} (aq) + \text{H}_2 (g)$$

Hydrogen gas; $$\text{Zn} (s) + \text{H}_2\text{SO}_4 (aq) \rightarrow \text{ZnSO}_4 (aq) + \text{H}_2 (g)$$

$$\text{Ca(OH)}_2 (aq)$$ and $$\text{H}_2 (g)$$

$$\text{LiH} (s) + \text{H}_2\text{O} (l) \rightarrow \text{LiOH} (aq) + \text{H}_2 (g)$$

$$\text{Zn} (s) + 2\text{H}^+ (aq) \rightarrow \text{Zn}^{2+} (aq) + \text{H}_2 (g)$$

Question 1

Which of the following best describes the reaction between lithium hydride and water?

Accepted Answer

It is a reaction that produces hydrogen gas and lithium hydroxide.

Question 2

What is the balanced chemical equation for the reaction between sodium metal and hydrochloric acid?

Accepted Answer

$$2	ext{Na} (s) + 2	ext{HCl} (aq) ightarrow 2	ext{NaCl} (aq) + 	ext{H}_2 (g)$$

Question 3

Which of the following is a product when barium hydride reacts with water?

Accepted Answer

$$	ext{Ba(OH)}_2 (aq)$$

Question 4

A student mixes zinc metal with sulfuric acid. Which gas is evolved, and what is the balanced equation?

Accepted Answer

Hydrogen gas; $$	ext{Zn} (s) + 	ext{H}_2	ext{SO}_4 (aq) ightarrow 	ext{ZnSO}_4 (aq) + 	ext{H}_2 (g)$$

Question 5

Which of the following statements is true regarding the reaction of ionic hydrides with water?

Accepted Answer

The reaction produces a metal hydroxide and hydrogen gas.

Question 6

If $$	ext{CaH}_2$$ reacts with water, what are the products?

Accepted Answer

$$	ext{Ca(OH)}_2 (aq)$$ and $$	ext{H}_2 (g)$$

Question 7

Which of the following best explains why hydrogen gas is produced when a reactive metal reacts with an acid?

Accepted Answer

The metal donates electrons to hydrogen ions, reducing them to hydrogen gas.

Question 8

What is the balanced equation for the reaction of lithium hydride with water?

Accepted Answer

$$	ext{LiH} (s) + 	ext{H}_2	ext{O} (l) ightarrow 	ext{LiOH} (aq) + 	ext{H}_2 (g)$$

Question 9

Which of the following metals will NOT produce hydrogen gas when reacted with hydrochloric acid under standard conditions?

Accepted Answer

Copper

Question 10

A chemist wants to produce hydrogen gas in the laboratory. Which of the following combinations would be most effective?

Accepted Answer

Reacting zinc metal with sulfuric acid

Question 11

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

Accepted Answer

$$	ext{Zn} (s) + 2	ext{H}^+ (aq) ightarrow 	ext{Zn}^{2+} (aq) + 	ext{H}_2 (g)$$

Question 12

Which of the following best describes the role of water in the reaction with an ionic hydride?

Accepted Answer

Water acts as an oxidizing agent, accepting electrons from hydride ions.

Question 13

If $$	ext{BaH}_2$$ reacts with water, what is the balanced equation?

Accepted Answer

$$	ext{BaH}_2 (s) + 2	ext{H}_2	ext{O} (l) ightarrow 	ext{Ba(OH)}_2 (aq) + 2	ext{H}_2 (g)$$

Question 14

Which of the following is a common misconception about the reaction of metals with acids?

Accepted Answer

All metals react with acids to produce hydrogen gas.

Question 15

A student adds excess hydrochloric acid to aluminum metal. What is the balanced equation for this reaction?

Accepted Answer

$$2	ext{Al} (s) + 6	ext{HCl} (aq) ightarrow 2	ext{AlCl}_3 (aq) + 3	ext{H}_2 (g)$$

Production of Hydrogen: Reactions and Examples

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