$$2\text{Na} (s) + \text{H}_2 (g) \rightarrow 2\text{NaH} (s)$$

$$\text{N}_2 (g) + 3\text{H}_2 (g) \rightarrow 2\text{NH}_3 (g)$$

$$\text{H}_2 (g) + \text{Br}_2 (g) \rightarrow 2\text{HBr} (g)$$

$$\text{Sr} (s) + \text{H}_2 (g) \rightarrow \text{SrH}_2 (s)$$

Question 1

Which of the following best describes an ionic hydride?

Accepted Answer

A compound formed when hydrogen reacts with group 1A or 2A metals, resulting in the transfer of electrons.

Question 2

Which of the following is a balanced equation for the formation of sodium hydride from its elements?

Accepted Answer

$$2	ext{Na} (s) + 	ext{H}_2 (g) ightarrow 2	ext{NaH} (s)$$

Question 3

Which of the following hydrides is correctly classified as a covalent (molecular) hydride?

Accepted Answer

$$	ext{NH}_3$$

Question 4

What is the oxidation state of hydrogen in $$	ext{LiH}$$?

Accepted Answer

$$-1$$

Question 5

Which of the following best describes a metallic hydride?

Accepted Answer

A hydride formed when hydrogen reacts with transition metals, with hydrogen atoms occupying interstitial sites in the metal lattice.

Question 6

Which of the following is a correct balanced equation for the formation of ammonia?

Accepted Answer

$$	ext{N}_2 (g) + 3	ext{H}_2 (g) ightarrow 2	ext{NH}_3 (g)$$

Question 7

Which of the following is a metallic hydride?

Accepted Answer

$$	ext{TiH}_2$$

Question 8

What type of hydride is $$	ext{CaH}_2$$?

Accepted Answer

Ionic hydride

Question 9

Which of the following statements about hydrides is correct?

Accepted Answer

Ionic hydrides are typically formed with group 1A and 2A metals.

Question 10

Which of the following equations represents the reaction of hydrogen gas with bromine gas to form hydrogen bromide?

Accepted Answer

$$	ext{H}_2 (g) + 	ext{Br}_2 (g) ightarrow 2	ext{HBr} (g)$$

Question 11

Which of the following best explains why $$	ext{BeH}_2 is $$not considered an ionic hydride?

Accepted Answer

Beryllium is a group 2A metal but forms covalent bonds due to its small size and high charge density.

Question 12

Which of the following hydrides would you expect to be a good conductor of electricity in the solid state?

Accepted Answer

$$	ext{TiH}_2$$

Question 13

Which of the following is a correct statement about the stoichiometry of metallic hydrides?

Accepted Answer

Metallic hydrides often have a non-stoichiometric ratio of metal to hydrogen.

Question 14

Which of the following best describes the bonding in $$	ext{CH}_4$$?

Accepted Answer

Covalent bonding with shared electron pairs between carbon and hydrogen.

Question 15

Which of the following is the correct balanced equation for the reaction of strontium with hydrogen gas to form strontium hydride?

Accepted Answer

$$	ext{Sr} (s) + 	ext{H}_2 (g) ightarrow 	ext{SrH}_2 (s)$$

Question 16

Which of the following hydrides is most likely to act as a strong reducing agent?

Accepted Answer

$$	ext{NaH}$$

Hydrogen Compounds: Types and Properties

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