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 ratio of hydrogen to oxygen atoms, while a mixture can have any ratio.

Question 2

Which of the following is the correct balanced chemical equation for the formation of water from hydrogen and oxygen?

Accepted Answer

$$\mathrm{2H_2 + O_2$ \rightarrow 2H_2O}$$

Question 3

Which property distinguishes water from its constituent elements, hydrogen and oxygen?

Accepted Answer

Water is used to extinguish flames, while hydrogen is explosive and oxygen is necessary for combustion.

Question 4

What type of bond is formed between sodium and chlorine in sodium chloride (NaCl)?

Accepted Answer

Ionic bond

Question 5

Which of the following best explains why sodium becomes a cation in the formation of NaCl?

Accepted Answer

Sodium loses an electron to become positively charged.

Question 6

Which of the following is the empirical formula for glucose (C$$_6H$_{12}O$_6$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 7

Which of the following elements exists naturally as a diatomic molecule?

Accepted Answer

Oxygen (O$$_2)$$

Question 8

Which of the following compounds is a molecular compound?

Accepted Answer

C$$_2H$_5O$$

Question 9

What is the correct name for the compound FeCl$$_3$$?

Accepted Answer

Iron(III) chloride

Question 10

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

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 11

Which of the following is the correct name for HNO$$_2 (aq$$)?

Accepted Answer

Nitrous acid

Question 12

What is the formula mass of water ($$\mathrm{H_2O}$$)? (Atomic masses: H = 1.01 amu, O = 16.00 amu)

Accepted Answer

$$\mathrm{18.02\ amu}$$

Question 13

A compound contains 40.0% C, 6.71% H, and 53.3% O by mass. If its molar mass is 90.08 g/mol, what is its molecular formula?

Accepted Answer

$$\mathrm{C_3H_6O_3}$$

Question 14

Which of the following best describes a hydrate?

Accepted Answer

An ionic compound with a fixed number of water molecules associated with each formula unit.

Question 15

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

Accepted Answer

Diphosphorus pentoxide

Question 16

What is the mass percent of hydrogen in hydrogen peroxide ($$\mathrm{H_2O_2}$$)? (Atomic masses: H = 1.01 g/mol, O = 16.00 g/mol)

Accepted Answer

$$\mathrm{6.30\%}$$

Question 17

Which of the following is a property of acids?

Accepted Answer

They react with metals to produce hydrogen gas.

Question 18

Which of the following is the correct formula for calcium chloride hexahydrate?

Accepted Answer

$$\mathrm{$$CaCl_2$$ \cdot 6H_2O}$$

Question 19

Which of the following is a hydrocarbon with only single bonds?

Accepted Answer

Ethane

Question 20

What is the correct name for the compound with the formula $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetroxide

Molecules and Compounds: Structure, Bonding, and Nomenclature

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