Question 1

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

Accepted Answer

Water samples from different sources always contain hydrogen and oxygen in a mass ratio of $$8.0:1.$$

Question 2

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

Accepted Answer

Compounds have properties distinct from the elements that compose them.

Question 3

Which of the following is the correct chemical formula for a compound formed between aluminum and oxygen?

Accepted Answer

$$\mathrm{Al_2O_3}$$

Question 4

If you decompose a $$17.0\ \mathrm{g}$$ sample of ammonia and obtain $$14.0\ \mathrm{g} of $$nitrogen and $$3.0\ \mathrm{g} of $$hydrogen, what is the nitrogen-to-hydrogen mass ratio?

Accepted Answer

$$4.7:1$$

Question 5

Which of the following is an empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

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 best describes a molecular compound?

Accepted Answer

A compound composed of two or more nonmetals with molecules as basic units.

Question 8

What is the correct name for the compound $$\mathrm{$$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

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

Accepted Answer

Dinitrogen pentoxide

Question 11

What is the formula mass of $$\mathrm{$$MgCl_2$$}$$? (Atomic masses: $$\mathrm{Mg} = 24.31\ \mathrm{amu}$$, $$\mathrm{Cl} = 35.45\ \mathrm{amu})$$

Accepted Answer

$$95.21\ \mathrm{amu}$$

Question 12

Which of the following is a binary acid?

Accepted Answer

$$\mathrm{HCl(aq)}$$

Question 13

What is the correct name for $$\mathrm{H_2SO_3(aq)}$$?

Accepted Answer

Sulfurous acid

Question 14

Which of the following is the correct name for $$\mathrm{$$KNO_3$$}$$?

Accepted Answer

Potassium nitrate

Question 15

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

Accepted Answer

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

Question 16

Which of the following is the correct name for $$\mathrm{NH_4NO_3}$$?

Accepted Answer

Ammonium nitrate

Question 17

What is the correct name for $$\mathrm{$$CuSO_4$$}$$, given that copper can have more than one possible charge?

Accepted Answer

Copper(II) sulfate

Question 18

Which of the following is the correct formula for iron(III) hydroxide?

Accepted Answer

$$\mathrm{Fe(OH)_3}$$

Question 19

Which of the following is a correct statement about polyatomic ions?

Accepted Answer

Polyatomic ions are groups of atoms with an overall charge that act as a unit in compounds.

Question 20

Which of the following is the correct name for $$\mathrm{$$HClO_4$$(aq)}$$?

Accepted Answer

Perchloric acid

Molecules and Compounds: Chapter 5 Study Notes

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