Question 1

Which of the following best describes the law of definite proportions as it applies to chemical compounds?

Accepted Answer

A compound always contains the same elements in the same ratio by mass.

Question 2

Which of the following is the correct empirical formula for glucose, C$$_6H$_{12}O$_6$$?

Accepted Answer

$$CH_2O$$

Question 3

A sample of an unknown compound contains 0.21 mol of zinc, 0.14 mol of phosphorus, and 0.56 mol of oxygen. What is its empirical formula?

Accepted Answer

$$Zn_3P_2O_8$$

Question 4

Which of the following compounds has the highest lattice energy based on the charges and ionic radii of its ions?

Accepted Answer

$$MgO$$

Question 5

What is the correct name for the compound Fe$$_2(SO$_4$$)$$_3$$?

Accepted Answer

Iron(III) sulfate

Question 6

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

Accepted Answer

$$K_3N$$

Question 7

A 10.00 g sample of CO$$_2$$ contains how many moles of CO$$_2$$? (Molar mass of CO$$_2 = 44.01 g/$$mol)

Accepted Answer

$$0.2272$$ mol

Question 8

Which of the following is the correct name for the compound N$$_2O$_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 9

What is the percent by mass of lithium in lithium carbonate, Li$$_2CO$_3$$? (Atomic masses: Li = 6.941, C = 12.01, O = 16.00)

Accepted Answer

$$18.79\%$$

Question 10

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

Accepted Answer

$$Ba(C_2H_3O_2)_2$$

Question 11

Which of the following is the correct name for HClO$$_3$$?

Accepted Answer

Chloric acid

Question 12

A hydrate of copper(II) sulfate contains five water molecules per formula unit. What is its correct formula?

Accepted Answer

$$CuSO_4$$ \cdot 5H_2O$$

Question 13

Which of the following is the correct molecular formula for a compound with an empirical formula of CH$$_2$$ and a molar mass of 42.12 g/mol? (Empirical formula mass = 14.03 g/mol)

Accepted Answer

$$C_3H_6$$

Question 14

Which of the following is the correct name for the polyatomic ion $$NO_3$$^-$$?

Accepted Answer

Nitrate

Question 15

What is the formula mass of lithium hydroxide, LiOH? (Atomic masses: Li = 6.941, O = 16.00, H = 1.008)

Accepted Answer

$$23.95$$ amu

Question 16

Which of the following is the correct name for the compound Al(OH)$$_3$$?

Accepted Answer

Aluminum hydroxide

Question 17

Which of the following is the correct formula for dinitrogen pentoxide?

Accepted Answer

$$N_2O_5$$

Question 18

A compound is found to be 30.45% nitrogen and 69.55% oxygen by mass, with a molar mass of approximately 92 g/mol. What is its molecular formula?

Accepted Answer

$$N_2O_4$$

Question 19

Which of the following is the correct name for the compound $$P_4S_{10}$$?

Accepted Answer

Tetraphosphorus decasulfide

Question 20

Which of the following best explains why $$MgO$$ has a higher lattice energy than $$NaCl$$?

Accepted Answer

The charges on $$Mg^{2+}$$ and $$O^{2-}$$ are greater than those on $$Na^+$$ and $$Cl^-$$, resulting in a stronger electrostatic attraction.

Chapter 5: Ionic and Covalent Compounds – Structured Study Notes

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