Question 1

Which of the following statements best explains why sodium (Na) forms a cation with a 1+ charge when it reacts with chlorine (Cl) to form sodium chloride (NaCl)?

Accepted Answer

Sodium loses one electron to achieve the same number of electrons as neon.

Question 2

What is the correct formula for the ionic compound formed between magnesium (Mg) and nitrogen (N)?

Accepted Answer

$$\mathrm{Mg}_2\mathrm{N}_3$$

Question 3

Which of the following is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 4

A sample contains 0.42 mol of zinc, 0.28 mol of phosphorus, and 1.12 mol of oxygen. What is the empirical formula of the compound?

Accepted Answer

Question 5

Which of the following best describes the difference between an ionic and a covalent bond?

Accepted Answer

Ionic bonds involve the transfer of electrons from a metal to a nonmetal, while covalent bonds involve the sharing of electrons between two nonmetals.

Question 6

What is the correct name for the acid $$\mathrm{HNO}_3$$?

Accepted Answer

Nitric acid

Question 7

Calculate the molar mass of $$\mathrm{CO}_2$$ using the atomic masses: C = 12.01 g/mol, O = 16.00 g/mol.

Accepted Answer

$$44.01\ \mathrm{g/mol}$$

Question 8

Which of the following is the correct formula for potassium acetate?

Accepted Answer

$$\mathrm{KC}_2\mathrm{H}_3\mathrm{O}_2$$

Question 9

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 10

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO}_3^-$$

Question 11

What is the correct name for $$\mathrm{CuSO}_4 \cdot 5\mathrm{H}_2\mathrm{O}$$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 12

Which of the following compounds is named dinitrogen tetroxide?

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_4$$

Question 13

How many molecules are present in 2.00 moles of water ($$\mathrm{H}_2\mathrm{O}$$)?

Accepted Answer

$$1.2044 	imes 10$$^{24}$$

Question 14

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 15

What is the formula mass of sodium sulfate ($$\mathrm{Na}_2\mathrm{SO}_4$$)? (Na = 22.99 g/mol, S = 32.07 g/mol, O = 16.00 g/mol)

Accepted Answer

$$142.05\ \mathrm{g/mol}$$

Question 16

Which of the following is the correct name for $$\mathrm{H}_2\mathrm{SO}_3$$?

Accepted Answer

Sulfurous acid

Question 17

A compound has an empirical formula of $$\mathrm{CH}_2$$ and a molar mass of 56.12 g/mol. What is its molecular formula?

Accepted Answer

$$\mathrm{C}_4\mathrm{H}_8$$

Question 18

Which of the following is the correct name for $$\mathrm{KNO}_2$$?

Accepted Answer

Potassium nitrite

Question 19

Which of the following statements about hydrates is correct?

Accepted Answer

Hydrates contain water molecules bound within their crystal structure.

Question 20

Which of the following is the correct name for $$\mathrm{P}_2\mathrm{O}_5$$?

Accepted Answer

Diphosphorus pentoxide

Compounds, Nomenclature, and Molecular Mass – General Chemistry 1A Chapter 3 Study Notes

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