Question 1

Which of the following best describes the difference between a mixture and a compound, as illustrated by a hydrogen and oxygen mixture versus water?

Accepted Answer

A compound has a fixed ratio of elements chemically bonded, while a mixture can have any ratio and the elements are not chemically bonded.

Question 2

Which of the following is the correct empirical formula for a compound with the molecular formula $$C_6H_{12}O_6$?

Accepted Answer

$$CH_2O$$

Question 3

Which of the following statements about ionic and covalent bonds is correct?

Accepted Answer

Ionic bonds involve the attraction between oppositely charged ions, while covalent bonds involve the sharing of electron pairs.

Question 4

Which of the following compounds is most likely to be ionic?

Accepted Answer

NaCl

Question 5

What is the correct name for the compound $$FeCl_3$$?

Accepted Answer

Iron(III) chloride

Question 6

Which of the following is the correct formula for barium hydroxide?

Accepted Answer

Ba(OH)_2

Question 7

A sample of a compound contains 40.0 g of carbon and 6.7 g of hydrogen. What is the empirical formula of the compound? (Atomic masses: C = 12.0 g/mol, H = 1.0 g/mol)

Accepted Answer

$$CH_2$$

Question 8

Which of the following is the correct name for $$H_2SO_4$$?

Accepted Answer

Sulfuric acid

Question 9

What is the molar mass of $$CO_2$$? (Atomic masses: C = 12.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$$44.01\ \mathrm{g/mol}$$

Question 10

Which of the following best describes the structure of an ionic solid such as sodium chloride?

Accepted Answer

A 3D lattice of alternating cations and anions held together by electrostatic attraction

Question 11

Which of the following is the correct name for $$NH_4$$^+$$?

Accepted Answer

Ammonium ion

Question 12

How many molecules are present in 18.0 g of water ($$H_2O$$)? (Molar mass of $$H_2O = 18.02\ \mathrm{g/mol}$$, Avogadro's number $$= 6.022 	imes 10$$^{23}$$ molecules/mol)

Accepted Answer

$$6.022 	imes 10$$^{23}$$

Question 13

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

Accepted Answer

$$N_2O_5$$

Question 14

Which of the following is a correct statement about naming binary molecular compounds?

Accepted Answer

Prefixes are used to indicate the number of atoms of each element, and the second element ends in -ide.

Question 15

Which of the following is the correct name for $$NO_2$$?

Accepted Answer

Nitrogen dioxide

Question 16

A compound is found to contain 63.5% silver, 8.2% nitrogen, and 28.3% oxygen by mass. What is its empirical formula? (Atomic masses: Ag = 107.9 g/mol, N = 14.0 g/mol, O = 16.0 g/mol)

Accepted Answer

$$AgNO_3$$

Question 17

Which of the following is the correct formula for the compound formed between calcium ions and phosphate ions?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Question 18

Which of the following is the correct name for $$HClO_3$$?

Accepted Answer

Chloric acid

Question 19

Which of the following best explains why water is used to extinguish flames, while hydrogen is explosive and oxygen is necessary for combustion?

Accepted Answer

Water is a liquid at room temperature and does not support combustion, while hydrogen and oxygen are gases that react explosively.

Chapter 3: Molecules and Compounds – General Chemistry Study Notes

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