$$12.0 + 2 \times 16.0 = 44.0 g/$$mol

$$2 \times 6.02 \times 10$$^{23}$$

$$2 \times 23.0 + 32.0 + 4 \times 16.0 = 142.0$$ amu

Question 1

Which of the following best describes the difference between an ionic bond and a covalent bond?

Accepted Answer

An ionic bond involves the attraction between oppositely charged ions, while a covalent bond involves the sharing of electrons between atoms.

Question 2

Which of the following compounds is an example of a molecular compound?

Accepted Answer

CO$$_2$$

Question 3

What is the empirical formula for a compound with the molecular formula C$$_6H$_{12}O$_6$$?

Accepted Answer

CH$$_2O$$

Question 4

Which of the following is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 5

A sample 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, H = 1.0)

Accepted Answer

CH$$_2$$

Question 6

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

Accepted Answer

Ba(OH)$$_2$$

Question 7

What is the molar mass of CO$$_2$$? (Atomic masses: C = 12.0 g/mol, O = 16.0 g/mol)

Accepted Answer

$$12.0 + 2 	imes 16.0 = 44.0 g/$$mol

Question 8

Which of the following is the correct name for H$$_2SO$_4$$?

Accepted Answer

Sulfuric acid

Question 9

How many molecules are in 88.0 g of CO$$_2$$? (Molar mass of CO$$_2 = 44.0 g/$$mol, Avogadro's number = $$6.02 	imes 10$$^{23}$$ molecules/mol)

Accepted Answer

$$2 	imes 6.02 	imes 10$$^{23}$$

Question 10

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

Accepted Answer

(NH$$_4$$)$$_2SO$_4$$

Question 11

Which of the following statements about ionic compounds is TRUE?

Accepted Answer

Ionic compounds are composed of cations and anions held together by electrostatic attraction.

Question 12

What is the correct name for the compound N$$_2O$_5$$?

Accepted Answer

Dinitrogen pentoxide

Question 13

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

Accepted Answer

Ca(NO$$_3$$)$$_2$$

Question 14

Which of the following is the correct name for the acid HClO$$_2$$?

Accepted Answer

Chlorous acid

Question 15

A compound contains 27.3% C, 72.7% O by mass. What is its empirical formula? (Atomic masses: C = 12.0, O = 16.0)

Accepted Answer

CO

Question 16

Which of the following is the correct name for the compound P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 17

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

Accepted Answer

Al$$_2(SO$_4$$)$$_3$$

Question 18

Which of the following is the correct name for the compound SO$$_3$$?

Accepted Answer

Sulfur trioxide

Question 19

What is the formula mass of Na$$_2SO$_4$$? (Atomic masses: Na = 23.0, S = 32.0, O = 16.0)

Accepted Answer

$$2 	imes 23.0 + 32.0 + 4 	imes 16.0 = 142.0$$ amu

Question 20

Which of the following is the correct name for the compound K$$_2SO$_4$$?

Accepted Answer

Potassium sulfate

Chapter 3: Molecules and Compounds – Study Notes

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