Question 1

Which of the following best describes the chemical formula $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

It is a compound consisting of one barium atom and two hydrogen atoms.

Question 2

What is the correct name for the compound with the formula $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

Barium hydride

Question 3

Which type of chemical bond is most likely present in $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

Ionic bond

Question 4

Given that barium is in Group 2 of the periodic table, what is the most likely charge on the barium ion in $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

$$+2$$

Question 5

If $$\mathrm{$$BaH_2$$} is $$dissolved in water, which of the following ions would you expect to be present in the solution?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$}$$ and $$\mathrm{H^-}$$

Question 6

Which of the following best explains why $$\mathrm{$$BaH_2$$} is $$considered an ionic compound?

Accepted Answer

It is formed from a metal (barium) and a nonmetal (hydrogen) with a transfer of electrons.

Question 7

Which of the following balanced chemical equations represents the synthesis of barium hydride from its elements?

Accepted Answer

$$\mathrm{Ba(s) + H_2$(g) \rightarrow $$BaH_2$$(s)}$$

Question 8

A sample of $$\mathrm{$$BaH_2$$}$$ reacts with water to produce barium hydroxide and hydrogen gas. Which balanced equation correctly represents this reaction?

Accepted Answer

$$\mathrm{$$BaH_2$$(s) + 2H_2O(l) \rightarrow Ba(OH)_2(aq) + 2H_2(g)}$$

Question 9

If you have 137 grams of barium and excess hydrogen gas, how many grams of $$\mathrm{$$BaH_2$$}$$ can be formed? (Molar mass: Ba = 137 g/mol, H = 1 g/mol)

Accepted Answer

139 g

Question 10

Which of the following statements about $$\mathrm{$$BaH_2$$} is $$correct?

Accepted Answer

It contains hydride ions, which are $$\mathrm{H^-}.$$

Question 11

Which of the following best describes the oxidation states of barium and hydrogen in $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

Barium: $$+2$$, Hydrogen: $$-1$$

Question 12

Which of the following is a real-world application of barium hydride ($$\mathrm{$$BaH_2$$}$$)?

Accepted Answer

It is used as a reducing agent in chemical synthesis.

Question 13

A chemist needs to prepare 0.5 moles of $$\mathrm{$$BaH_2$$}. $$How many grams of $$\mathrm{$$BaH_2$$}$$ are required? (Molar mass: Ba = 137 g/mol, H = 1 g/mol)

Accepted Answer

69.5 g

Question 14

Which of the following best explains why $$\mathrm{$$BaH_2$$}$$ reacts vigorously with water?

Accepted Answer

The hydride ion ($$\mathrm{H^-}) is a $$strong base and reacts with water to produce hydrogen gas.

Question 15

Which of the following best describes the electron transfer in the formation of $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

Barium loses two electrons, each hydrogen atom gains one electron.

Question 16

Which of the following is the correct Lewis structure for $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

$$\mathrm{Ba$$^{2+}$$}$$ ion surrounded by two $$\mathrm{H^-}$$ ions

Question 17

If 5.0 g of $$\mathrm{$$BaH_2$$}$$ reacts completely with excess water, how many liters of hydrogen gas ($$\mathrm{H_2$}) at $$STP are produced? (Molar mass $$\mathrm{$$BaH_2$$} = 139 g/$$mol, 1 mol gas at STP = 22.4 L)

Accepted Answer

0.81 L

Question 18

Which of the following statements is true about the hydride ion ($$\mathrm{H^-}) in$$ $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

It acts as a strong base when dissolved in water.

Question 19

Which of the following best describes the crystal structure of $$\mathrm{$$BaH_2$$}$$?

Accepted Answer

It forms an ionic lattice with $$\mathrm{Ba$$^{2+}$$}$$ and $$\mathrm{H^-}$$ ions.

Barium Hydride (BaH₂): Properties and Chemical Context

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