Question 1

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

Accepted Answer

Ionic compounds are formed by the electrostatic attraction between oppositely charged ions, while covalent compounds are formed by sharing electrons between atoms.

Question 2

Which of the following is the correct Lewis dot symbol for a fluoride ion?

Accepted Answer

$$[\mathrm{F} \cdot \cdot \cdot \cdot \cdot \cdot \cdot \cdot]^-$$

Question 3

Which of the following compounds has the highest lattice energy?

Accepted Answer

$$\mathrm{LiI}$$

Question 4

What is the correct name for the compound $$\mathrm{FeCl}_3$$?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following is the empirical formula for glucose ($$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$)?

Accepted Answer

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

Question 6

A compound is found to contain 30.45% nitrogen and 69.55% oxygen by mass. If its molar mass is approximately 92 g/mol, what is its molecular formula?

Accepted Answer

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

Question 7

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

Accepted Answer

$$\mathrm{K}_3\mathrm{N}$$

Question 8

What is the percent by mass of lithium in lithium carbonate ($$\mathrm{Li}_2\mathrm{CO}_3$$)? (Atomic masses: Li = 6.94, C = 12.01, O = 16.00)

Accepted Answer

18.79%

Question 9

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

Accepted Answer

Chloric acid

Question 10

How many molecules of water are present in 3.26 g of $$\mathrm{H}_2\mathrm{O}$$? (Molar mass of $$\mathrm{H}_2\mathrm{O} = 18.02 g/$$mol, $$N_A = 6.022 	imes 10$$^{23}$$)

Accepted Answer

$$1.09 	imes 10$$^{23}$$

Question 11

Which of the following is the correct formula for aluminum oxide?

Accepted Answer

$$\mathrm{Al}_2\mathrm{O}_3$$

Question 12

Which of the following statements about hydrates is correct?

Accepted Answer

Hydrates are compounds that have a specific number of water molecules associated with their solid structure.

Question 13

What is the molecular mass of propane ($$\mathrm{C}_3\mathrm{H}_8$$)? (Atomic masses: C = 12.01, H = 1.008)

Accepted Answer

44.10 amu

Question 14

Which of the following is the correct name for $$\mathrm{P}_4\mathrm{S}_{10}$$?

Accepted Answer

Tetraphosphorus decasulfide

Question 15

Which of the following is a polyatomic ion?

Accepted Answer

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

Question 16

Which law states that different samples of a given compound always contain the same elements in the same ratio?

Accepted Answer

Law of Definite Proportions

Question 17

What is the correct formula for barium acetate?

Accepted Answer

$$\mathrm{Ba(C}_2\mathrm{H}_3\mathrm{O}_2)_2$$

Question 18

Which of the following is the correct name for $$\mathrm{Al(OH)}_3$$?

Accepted Answer

Aluminum hydroxide

Question 19

Which of the following is the correct formula for the perchlorate ion?

Accepted Answer

$$\mathrm{ClO}_4^-$$

Question 20

A sample contains 0.905 mol of sodium chloride. What is its mass? (Molar mass of NaCl = 58.44 g/mol)

Accepted Answer

52.9 g

Ionic and Covalent Compounds: Structure, Nomenclature, and Calculations

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