Question 1

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

Accepted Answer

Ionic compounds are composed of cations and anions held together by electrostatic forces, while molecular compounds are composed of nonmetals held together by covalent bonds.

Question 2

What is the empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 3

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

Accepted Answer

$$Al_2S_3$$

Question 4

A sample of a compound contains 72.4% Fe and 27.6% O by mass. What is the empirical formula of this compound? (Fe = 55.85, O = 16.00)

Accepted Answer

$$Fe_3O_4$$

Question 5

Which of the following is a molecular element?

Accepted Answer

Chlorine ($$Cl_2)$$

Question 6

What is the mass percent of calcium in $$CaCl_2$$? (Ca = 40.08, Cl = 35.45)

Accepted Answer

36.11%

Question 7

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$NH_4NO_3$$

Question 8

What is the correct name for $$Fe(NO_3$)_3$$?

Accepted Answer

Iron(III) nitrate

Question 9

How many moles are in 50.0 g of $$PbO_2$$? (Pb = 207.2, O = 16.00)

Accepted Answer

0.209 mol

Question 10

Which of the following is the correct molecular formula for a compound with an empirical formula of $$C_5H_3$$ and a molar mass of 252 g/mol? (C = 12.01, H = 1.01)

Accepted Answer

$$C_{20}H$$_{12}$$

Question 11

Which of the following best describes the process of combustion analysis for determining empirical formulas?

Accepted Answer

It determines the masses of $$CO_2$$ and $$H_2O$$ produced to calculate the original amounts of C and H in the sample.

Question 12

What is the correct name for $$CuF_2$$?

Accepted Answer

Copper(II) fluoride

Question 13

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

Accepted Answer

$$N_2O_4$$

Question 14

A 0.844 g sample of caproic acid produces 0.784 g of $$H_2O$$ and 1.92 g of $$CO_2$$ upon combustion. If the molar mass of caproic acid is 116.2 g/mol, what is its molecular formula? (C = 12.01, H = 1.008, O = 16.00)

Accepted Answer

$$C_6H_{12}O_2$

Question 15

Which of the following is the correct name for $$Ca(C_2H_3O_2)_2$$?

Accepted Answer

Calcium acetate

Question 16

Which of the following is a correct statement about acids?

Accepted Answer

Acids are molecular compounds that release $$H^+$$ ions when dissolved in water.

Question 17

What is the formula mass of $$H_2SO_4$$? (H = 1.01, S = 32.07, O = 16.00)

Accepted Answer

$$98.09$$ amu

Question 18

Which of the following is the correct name for $$TiCl_4$$?

Accepted Answer

Titanium(IV) chloride

Question 19

Which of the following is a correct classification for $$CO$$?

Accepted Answer

Molecular compound

Question 20

Which of the following is the correct formula for a compound formed between calcium ions and phosphate ions?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

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