Question 1

Which of the following statements best describes the Law of Constant Composition?

Accepted Answer

A compound always contains the same elements in the same fixed ratio by mass.

Question 2

Which of the following is the correct empirical formula for a compound with the molecular formula $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 3

Which of the following is a molecular element?

Accepted Answer

$$\mathrm{O}_2$$

Question 4

What is the correct chemical formula for magnesium chloride, given that magnesium forms a $$2^+$$ ion and chloride forms a $$1^-$$ ion?

Accepted Answer

$$\mathrm{MgCl}_2$$

Question 5

Which of the following names is correct for the compound $$\mathrm{Fe}_2\mathrm{O}_3$$?

Accepted Answer

Iron(III) oxide

Question 6

Which of the following compounds is classified as an ionic compound?

Accepted Answer

$$\mathrm{KNO}_3$$

Question 7

What is the correct name for the compound $$\mathrm{Na}_2\mathrm{SO}_4$$?

Accepted Answer

Sodium sulfate

Question 8

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

Accepted Answer

$$\mathrm{N}_2\mathrm{O}_5$$

Question 9

Which of the following is the correct name for $$\mathrm{HClO}_3$$?

Accepted Answer

Chloric acid

Question 10

Calculate the formula mass of $$\mathrm{CaCO}_3 ($$calcium carbonate). (Atomic masses: Ca = 40.1, C = 12.0, O = 16.0)

Accepted Answer

$$100.1\ \mathrm{g/mol}$$

Question 11

Which of the following is the correct name for $$\mathrm{P}_2\mathrm{O}_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 12

A sample of a compound contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

$$\mathrm{CH}_2\mathrm{O}$$

Question 13

Which of the following is a binary acid?

Accepted Answer

Hydrobromic acid

Question 14

Which of the following formulas represents a compound containing a polyatomic ion?

Accepted Answer

$$\mathrm{NaNO}_3$$

Question 15

Which of the following is the correct name for $$\mathrm{CuSO}_4$$?

Accepted Answer

Copper(II) sulfate

Question 16

Which of the following is an atomic element?

Accepted Answer

$$\mathrm{Fe}$$

Question 17

A compound is found to have a molar mass of $$58\ \mathrm{g/mol}$$ and an empirical formula of $$\mathrm{C}_2\mathrm{H}_5. $$What is its molecular formula?

Accepted Answer

$$\mathrm{C}_4\mathrm{H}_{10}$$

Question 18

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

Accepted Answer

$$\mathrm{Al}_2(\mathrm{SO}_4)_3$$

Question 19

Which of the following is the correct name for $$\mathrm{N}_2\mathrm{O}_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 20

Which of the following best describes a molecular compound?

Accepted Answer

A compound formed by the sharing of electrons between nonmetal atoms.

Chemical Compounds: Composition, Classification, and Nomenclature

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