Question 1

Which of the following best describes Avogadro's Number?

Accepted Answer

The number of particles in exactly 12 grams of $$^{12}C.$$

Question 2

Which of the following is an example of a molecular element?

Accepted Answer

O$$_2$$

Question 3

What is the empirical formula for a compound with the molecular formula $$C_2H_4$$?

Accepted Answer

$$CH_2$$

Question 4

Which of the following compounds is classified as an ionic compound?

Accepted Answer

NaCl

Question 5

A sample contains $$1.204 	imes 10$$^{24}$$ molecules of water. How many moles of water does this represent? (Avogadro's number = 6.022$$ 	imes $$10^{23})$$

Accepted Answer

2.00 mol

Question 6

Which of the following best describes the difference between a coefficient and a subscript in a chemical formula?

Accepted Answer

A coefficient changes the amount of molecules, while a subscript changes the composition and identity.

Question 7

Which of the following is the correct formula for a compound formed from aluminum ions and oxide ions?

Accepted Answer

Al$$_2O$_3$$

Question 8

What is the correct name for the compound $$CoCl_2$$ \cdot 6H_2O$$?

Accepted Answer

Cobalt(II) chloride hexahydrate

Question 9

Which of the following is a polyatomic ion?

Accepted Answer

NH$$_4^+$$

Question 10

What is the correct name for the compound $$SO_3$$^{2-}$$?

Accepted Answer

Sulfite

Question 11

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by sharing electrons between two atoms.

Question 12

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

Accepted Answer

Mg(NO$$_3$$)$$_2$$

Question 13

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

Accepted Answer

Dinitrogen tetroxide

Question 14

Which of the following is a correct statement about the formation of ionic compounds?

Accepted Answer

Metals lose electrons to become cations.

Question 15

Which of the following is the correct empirical formula for ethylene glycol ($$C_2H_6O_2$$)?

Accepted Answer

$$CH_3O$$

Question 16

Which of the following best describes the difference between an atomic element and a molecular element?

Accepted Answer

Atomic elements exist as single atoms, while molecular elements exist as molecules made of two or more atoms.

Question 17

Which of the following is the correct name for $$PCl_5$$?

Accepted Answer

Phosphorus pentachloride

Question 18

A hydrate is best described as:

Accepted Answer

A compound that contains water molecules within its crystal structure.

Question 19

Which of the following is the correct formula for the compound formed from potassium ions and nitride ions?

Accepted Answer

K$$_3N$$

Question 20

Which of the following is the correct name for $$Na_2SO_4 \cdot 5H_2O$$?

Accepted Answer

Sodium sulfate pentahydrate

Molecules and Compounds: Structure, Classification, and Nomenclature

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