Question 1

Which of the following statements best describes an empirical formula?

Accepted Answer

It gives the lowest whole-number ratio of atoms of each element in a compound.

Question 2

What is the empirical formula for a compound with the molecular formula $C_6H_{12}O_6$?

Accepted Answer

$CH_2O$

Question 3

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

Accepted Answer

CO$_2$

Question 4

A student is given a sample of a compound and determines that it contains 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is the empirical formula of this compound?

Accepted Answer

$CH_2O$

Question 5

Which of the following is the correct name for the compound $FeCl_3$?

Accepted Answer

Iron(III) chloride

Question 6

What is the correct formula for barium nitrate?

Accepted Answer

$Ba(NO_3)_2$

Question 7

Which of the following best describes a polyatomic ion?

Accepted Answer

A group of atoms covalently bonded that carries a net charge.

Question 8

What is the name of the compound $Na_2SO_4 \cdot 10H_2O$?

Accepted Answer

Sodium sulfate decahydrate

Question 9

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

Accepted Answer

$AlPO_4$

Question 10

A compound is found to have the empirical formula $CH_2O$ and a molar mass of 180 g/mol. What is its molecular formula?

Accepted Answer

$C_6H_{12}O_6$

Question 11

Which of the following is the correct name for $H_2SO_3$ (aq)?

Accepted Answer

Sulfurous acid

Question 12

What is the formula mass of $Ca(NO_3)_2$? (Atomic masses: Ca = 40.08 amu, N = 14.01 amu, O = 16.00 amu)

Accepted Answer

$164.10$ amu

Question 13

Which of the following is the correct name for $N_2O_5$?

Accepted Answer

Dinitrogen pentoxide

Question 14

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

Accepted Answer

They are generally composed of metals and nonmetals.

Question 15

What is the correct name for $CuSO_4 \cdot 5H_2O$?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 16

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

Accepted Answer

$(NH_4)_2CO_3$

Question 17

A sample of a hydrate of magnesium sulfate has a mass of 12.0 g before heating and 6.0 g after heating to remove all water. What is the formula of the hydrate? (Molar mass of $MgSO_4 = 120$ g/mol, $H_2O = 18$ g/mol)

Accepted Answer

$MgSO_4 \cdot 1H_2O$

Question 18

Which of the following is the correct name for $HClO_4$ (aq)?

Accepted Answer

Perchloric acid

Question 19

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

Accepted Answer

$Ca_3(PO_4)_2$

Question 20

Which of the following best explains why $NCl_3$ is called nitrogen trichloride, but $AlCl_3$ is called aluminum chloride?

Accepted Answer

Because $NCl_3$ is a molecular compound and $AlCl_3$ is an ionic compound.

Chapter 5: Molecules and Compounds – Chemical Formulas, Polyatomic Ions, and Chemical Bonds

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