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

Study Guide - Practice Questions