Question 1

Which statement best describes the law of constant composition as it applies to water?

Accepted Answer

All samples of pure water contain hydrogen and oxygen in a fixed mass ratio of 8:1.

Question 2

Which of the following is a correct chemical formula for a compound containing magnesium and nitrate ions?

Accepted Answer

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

Question 3

What is the empirical formula for glucose, $$\mathrm{C_6H_{12}O_6$}$$?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 4

Which of the following best explains why the properties of sodium chloride (table salt) are different from those of sodium and chlorine?

Accepted Answer

The properties of a compound are generally different from the properties of the elements that compose it.

Question 5

Which of the following is a molecular element?

Accepted Answer

Chlorine ($$\mathrm{Cl_2$})$$

Question 6

What is the correct name for the compound $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 7

Which of the following compounds is an example of a Type I binary ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 8

Calculate the formula mass of $$\mathrm{Ca(NO_3$)_2}$$ given the atomic masses: Ca = 40.08 amu, N = 14.01 amu, O = 16.00 amu.

Accepted Answer

$$\mathrm{164.10\ amu}$$

Question 9

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

Accepted Answer

Sulfuric acid

Question 10

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound contains elements in fixed, definite proportions; a mixture contains elements in variable proportions.

Question 11

What is the correct formula for the ionic compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 12

Which of the following is the correct name for $$\mathrm{K_2SO_4}$$?

Accepted Answer

Potassium sulfate

Question 13

Which of the following is a polyatomic ion found in household bleach?

Accepted Answer

Hypochlorite ($$\mathrm{ClO^-})$$

Question 14

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 15

A sample of ammonia ($$\mathrm{NH_3$}) is $$decomposed and found to contain 14.0 g of nitrogen and 3.0 g of hydrogen. What is the mass ratio of nitrogen to hydrogen in ammonia?

Accepted Answer

$$4.7:1$$

Question 16

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

Accepted Answer

$$\mathrm{NH_4NO_3}$$

Question 17

Which of the following is a correct statement about the subscripts in a chemical formula?

Accepted Answer

Changing a subscript changes the compound to a different substance.

Question 18

What is the correct name for $$\mathrm{$$HNO_2$$} (aq$$)?

Accepted Answer

Nitrous acid

Question 19

Which of the following best describes the basic unit of an ionic compound such as sodium chloride?

Accepted Answer

Formula unit

Question 20

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

Accepted Answer

Carbon monoxide

Chapter 5: Molecules and Compounds – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards