Question 1

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

Accepted Answer

Water is a compound with a fixed 2:1 ratio of hydrogen to oxygen atoms, while a mixture can have any ratio.

Question 2

Which type of bond is formed when sodium reacts with chlorine to form sodium chloride?

Accepted Answer

Ionic bond

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 statements about ionic compounds is TRUE?

Accepted Answer

Ionic compounds conduct electricity when dissolved in water.

Question 5

Which of the following best explains why $$MgO$$ has a higher melting point than $$NaCl$$?

Accepted Answer

$$MgO$$ has ions with larger charges.

Question 6

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

Accepted Answer

Iron(III) chloride

Question 7

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

Accepted Answer

$$AlN$$

Question 8

A sample of a compound contains 24.5 g of nitrogen and 70.0 g of oxygen. What is the empirical formula of the compound? (Atomic masses: N = 14.0, O = 16.0)

Accepted Answer

$$N_2O_5$$

Question 9

Which of the following is the correct name for $$P_2O_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 10

Calculate the mass percent of chlorine in $$CCl_4. ($$Atomic masses: C = 12.01, Cl = 35.45)

Accepted Answer

92.2%

Question 11

Which of the following statements about the octet rule is most accurate?

Accepted Answer

Atoms form bonds to lower their potential energy; the octet rule helps predict bond formation.

Question 12

How many molecules are in 0.500 grams of $$H_2O$$? (Molar mass $$H_2O = 18.02 g/$$mol, $$N_A = 6.022 	imes 10$$^{23}$$ mol$$^{-1}$$)

Accepted Answer

$$1.67 	imes 10$$^{22}$$

Question 13

Which of the following is a correct ratio derived from the molecular formula for water, $$H_2O$$?

Accepted Answer

2 mol H : 1 mol O

Question 14

Which of the following best describes a structural formula?

Accepted Answer

It shows the arrangement of atoms and how they are bonded.

Question 15

What is the correct name for $$Na_2SO_4 \cdot 10H_2O$$?

Accepted Answer

Sodium sulfate decahydrate

Question 16

Which of the following is a polyatomic ion?

Accepted Answer

$$NO_3$$^-$$

Question 17

A compound has the empirical formula $$CH_2$$ and a molar mass of 56.1 g/mol. What is its molecular formula? (C = 12.01, H = 1.01)

Accepted Answer

$$C_4H_8$$

Question 18

Which of the following is the correct name for $$N_2O_4$$?

Accepted Answer

Dinitrogen tetroxide

Question 19

Which of the following is a property of ionic solids predicted by the Lewis theory?

Accepted Answer

They are brittle and shatter when struck.

Question 20

Which of the following best describes the role of lattice energy in the formation of ionic compounds?

Accepted Answer

It is the energy released when gaseous ions form a solid crystal lattice.

Molecules and Compounds: Structure, Bonding, and Formulas

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