Question 1

Which of the following compounds is named correctly according to the rules for binary ionic compounds containing a metal with an invariant charge?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 2

What is the correct formula for magnesium nitrate?

Accepted Answer

$$\mathrm{Mg(NO_3$)_2}$$

Question 3

Which of the following is the empirical formula for glucose ($$\mathrm{C_6H_{12}O_6$}$$)?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 4

A compound is found to contain 40.0% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 5

Which of the following best describes the bonding in sodium chloride ($$\mathrm{NaCl}$$)?

Accepted Answer

Ionic bonding between a metal and a nonmetal

Question 6

What is the correct name for $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following is the correct name for $$\mathrm{H_2SO_4} in $$aqueous solution?

Accepted Answer

Sulfuric acid

Question 8

A sample of a compound contains 2.00 mol of carbon, 4.00 mol of hydrogen, and 2.00 mol of oxygen. What is the empirical formula?

Accepted Answer

$$\mathrm{CH_2O}$$

Question 9

Which of the following is a molecular element?

Accepted Answer

$$\mathrm{O_2$}$$

Question 10

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

Accepted Answer

$$18.02\ \mathrm{amu}$$

Question 11

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 12

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

Accepted Answer

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

Question 13

A hydrate of copper(II) sulfate has the formula $$\mathrm{$$CuSO_4$$ \cdot 5H_2O}. $$What is the correct name for this compound?

Accepted Answer

Copper(II) sulfate pentahydrate

Question 14

Which of the following is the correct name for $$\mathrm{$$HNO_2$$}$$?

Accepted Answer

Nitrous acid

Question 15

Which of the following best describes the difference between an empirical formula and a molecular formula?

Accepted Answer

The empirical formula shows the simplest whole-number ratio of atoms, while the molecular formula shows the actual number of atoms in a molecule.

Question 16

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

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 17

A compound contains 27.3% carbon and 72.7% oxygen by mass. What is the empirical formula? (Atomic masses: C = 12.01, O = 16.00)

Accepted Answer

$$\mathrm{CO_2$}$$

Question 18

Which of the following is the correct name for $$\mathrm{K_2Cr_2O_7}$$?

Accepted Answer

Potassium dichromate

Question 19

Which of the following is a property of acids as described in the study materials?

Accepted Answer

They dissolve many metals such as Zn, Fe, and Mg.

Question 20

Which of the following is the correct name for $$\mathrm{Na_2SO_3}$$?

Accepted Answer

Sodium sulfite

CHEM 131 Chapter 3: Molecules and Compounds: Structure, Nomenclature, and Calculations

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