Question 1

Which statement best explains why the properties of sodium chloride (table salt) are different from those of its constituent elements, sodium and chlorine?

Accepted Answer

Sodium chloride is a compound, and compounds have properties distinct from the elements that compose them.

Question 2

According to the law of constant composition, which of the following statements is true for pure water?

Accepted Answer

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

Question 3

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

$$\displaystyle \frac{14.0\ \mathrm{g\ N}}{3.0\ \mathrm{g\ H}} = 4.7$$

Question 4

How many atoms are present in one molecule of glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

24

Question 5

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 can have variable proportions.

Question 6

What is the correct chemical formula for the compound formed from magnesium and oxygen?

Accepted Answer

$$\mathrm{MgO}$$

Question 7

How many hydrogen atoms are in the formula for ammonium phosphate, $$(\mathrm{NH_4$})_3\mathrm{PO_4$}$$?

Accepted Answer

12

Question 8

Which of the following is an example of an atomic element?

Accepted Answer

Mercury ($$\mathrm{Hg})$$

Question 9

Which of the following elements exists as a diatomic molecule at room temperature?

Accepted Answer

Chlorine

Question 10

How many different kinds of atoms are in a molecule of penicillin ($$\mathrm{C$$_{14}$$H_{20}N_2SO_4$$}$)?

Accepted Answer

5

Question 11

Which of the following is the correct formula for nickel(II) carbonate?

Accepted Answer

$$\mathrm{$$NiCO_3$$}$$

Question 12

What is the name of the compound $$\mathrm{Fe_2O_3}$$?

Accepted Answer

Iron(III) oxide

Question 13

Which of the following is named incorrectly?

Accepted Answer

$$\mathrm{Zn(OH)_2}$$, zinc(II) hydroxide

Question 14

Which of the following is a polyatomic ion?

Accepted Answer

Both $$\mathrm{NO_3$^-}$$ and $$\mathrm{NH_4$^+}$$

Question 15

What is the formula mass of sodium sulfite ($$\mathrm{Na_2SO_3}$$)? (Atomic masses: Na = 23.0, S = 32.1, O = 16.0)

Accepted Answer

$$119.1\ \mathrm{amu}$$

Question 16

Which of the following best describes aluminum carbonate?

Accepted Answer

Ionic compound

Question 17

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

Accepted Answer

$$(\mathrm{NH_4$})_2\mathrm{Cr_2O_7}$$

Question 18

Which of the following is the correct name for $$\mathrm{NH_4ClO_4}$$?

Accepted Answer

Ammonium perchlorate

Question 19

What is the correct formula for dinitrogen tetrahydride?

Accepted Answer

$$\mathrm{N_2H_4}$$

Question 20

Which of the following is the correct formula for chloric acid?

Accepted Answer

$$\mathrm{$$HClO_3$$}$$

Chapter 5: Molecules and Compounds – Structured Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards