Question 1

Which statement best describes the law of constant composition?

Accepted Answer

All samples of a given compound have the same proportions of their constituent elements.

Question 2

If you decompose 36.0 g of water, how many grams of oxygen and hydrogen would you expect to obtain, based on the law of constant composition?

Accepted Answer

32.0 g oxygen and 4.0 g hydrogen

Question 3

Which of the following is the correct chemical formula for table salt?

Accepted Answer

$$\mathrm{NaCl}$$

Question 4

What is the empirical formula for hydrogen peroxide, given its molecular formula is $$\mathrm{H_2O_2}$$?

Accepted Answer

$$\mathrm{HO}$$

Question 5

Which of the following is a molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

How many oxygen atoms are present in one formula unit of $$\mathrm{Mg(NO_3$)_2}$$?

Accepted Answer

6

Question 7

Which of the following elements exists naturally as a diatomic molecule?

Accepted Answer

Chlorine

Question 8

What is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 9

Which of the following is the correct formula for calcium nitrate?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 10

What is the formula mass of $$\mathrm{CO_2$}$$? (Atomic masses: C = 12.0 u, O = 16.0 u)

Accepted Answer

$$44.0\ \mathrm{u}$$

Question 11

Which of the following is the correct name for $$\mathrm{H_2SO_4} (aq$$)?

Accepted Answer

Sulfuric acid

Question 12

What is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 13

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 14

What is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 15

Which of the following compounds is an ionic compound?

Accepted Answer

$$\mathrm{KBr}$$

Question 16

What is the correct name for $$\mathrm{$$NaHCO_3$$}$$, a common ingredient in baking soda?

Accepted Answer

Sodium bicarbonate

Question 17

Which of the following acids is responsible for acid rain formed from vehicle emissions?

Accepted Answer

$$\mathrm{$$HNO_3$$} ($$aqueous)

Question 18

What is the correct name for $$\mathrm{$$KClO_4$$}$$?

Accepted Answer

Potassium perchlorate

Question 19

Which of the following is the correct formula for iron(II) nitrate?

Accepted Answer

$$\mathrm{Fe(NO_3$)_2}$$

Question 20

Which of the following is the correct name for $$\mathrm{$$HClO_2$$} (aq$$)?

Accepted Answer

Chlorous acid

Molecules and Compounds: Structure, Classification, and Nomenclature

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