Question 1

Which of the following statements best illustrates the law of constant composition?

Accepted Answer

All pure samples of water, regardless of their source, have a mass ratio of oxygen to hydrogen of $$8:1.$$

Question 2

Which of the following is the correct empirical formula for hydrogen peroxide, whose molecular formula is $$H_2O_2$$?

Accepted Answer

$$HO$$

Question 3

What is the correct chemical formula for a compound formed from aluminum ions ($$Al^{3+}) $$and oxide ions ($$O^{2-}$$)?

Accepted Answer

$$Al_2O_3$$

Question 4

Which of the following compounds is classified as a molecular compound?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 5

How many oxygen atoms are present in one formula unit of $$Mg(NO_3$)_2$$?

Accepted Answer

6

Question 6

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

Accepted Answer

Iron(III) chloride

Question 7

What is the correct formula for calcium phosphate, given that the phosphate ion is $$PO_4$$^{3-}$$ and the calcium ion is Ca$$^{2+}$$?

Accepted Answer

$$Ca_3$$($$PO_4)_2$

Question 8

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

Accepted Answer

Dinitrogen pentoxide

Question 9

A sample of ammonia ($$NH_3) is $$decomposed and found to contain 14.0 g of nitrogen and 3.0 g of hydrogen. What is the mass ratio of nitrogen to hydrogen in ammonia?

Accepted Answer

$$4.7:1$$

Question 10

Which of the following is the correct name for $$H_2SO_4 (aq$$)?

Accepted Answer

Sulfuric acid

Question 11

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

Accepted Answer

Nitrogen

Question 12

What is the formula mass of sodium carbonate ($$Na_2CO_3$$)? (Atomic masses: $$Na = 23.0$$, $$C = 12.0$$, $$O = 16.0)$$

Accepted Answer

$$106.0 g/$$mol

Question 13

Which of the following is the correct name for $$KNO_2$$?

Accepted Answer

Potassium nitrite

Question 14

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

Accepted Answer

They are composed of cations and anions in a three-dimensional array.

Question 15

What is the correct name for $$HClO_3 (aq$$)?

Accepted Answer

Chloric acid

Question 16

Which of the following formulas represents a compound containing both a polyatomic cation and a polyatomic anion?

Accepted Answer

$$NH_4NO_3$$

Question 17

Which of the following is the correct name for $$CuSO_4$$?

Accepted Answer

Copper(II) sulfate

Question 18

Which of the following is the correct formula for iron(III) hydroxide?

Accepted Answer

$$Fe(OH)_3$$

Question 19

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

Accepted Answer

Diphosphorus pentoxide

Question 20

A student is given a white powder and told it is either sodium chloride ($$NaCl) or $$sucrose ($$C_{12}H$$_{22}$$O_{11}$). Which of the following would best distinguish between the two at the molecular level?

Accepted Answer

Determine if the sample contains both sodium and chlorine atoms in a 1:1 ratio.

Molecules and Compounds: Structure, Classification, and Nomenclature

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