Question 1

Which of the following best illustrates the Law of Constant Composition?

Accepted Answer

A sample of water always contains hydrogen and oxygen in a 2:1 ratio by atom, regardless of the source.

Question 2

Which of the following is a molecular element?

Accepted Answer

O2

Question 3

What is the correct chemical formula for magnesium nitrate?

Accepted Answer

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

Question 4

Which of the following compounds is an example of an ionic compound?

Accepted Answer

$$\mathrm{NaCl}$$

Question 5

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

Accepted Answer

Iron(III) chloride

Question 6

Which of the following is a polyatomic ion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 7

What is the correct formula for ammonium sulfate?

Accepted Answer

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

Question 8

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture of oil and water

Question 9

What is the correct name for $$\mathrm{H_2SO_3}$$?

Accepted Answer

Sulfurous acid

Question 10

Which of the following is the correct formula for lead(II) nitrate?

Accepted Answer

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

Question 11

Which of the following statements about ionic compounds is TRUE?

Accepted Answer

They always contain cations and anions in a ratio that balances the overall charge.

Question 12

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

Accepted Answer

Dinitrogen tetroxide

Question 13

Which of the following is a binary acid?

Accepted Answer

$$\mathrm{HCl(aq)}$$

Question 14

Which of the following is the correct formula for phosphorous acid?

Accepted Answer

$$\mathrm{H_3PO_3}$$

Question 15

Which of the following is a correct example of a molecular compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 16

What is the correct name for $$\mathrm{$$KNO_3$$}$$?

Accepted Answer

Potassium nitrate

Question 17

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A compound has a fixed ratio of elements, while a mixture can have variable proportions of its components.

Question 18

What is the correct name for $$\mathrm{Cu_2O}$$?

Accepted Answer

Copper(I) oxide

Question 19

Which of the following is the correct formula for hydroiodic acid?

Accepted Answer

$$\mathrm{HI}$$

Question 20

Which of the following is a polyatomic element?

Accepted Answer

$$\mathrm{S_8$}$$

Chapter 5: Molecules and Compounds – Structured Study Notes

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