Question 1

Which of the following statements about gases is correct?

Accepted Answer

Gases have indefinite shape and indefinite volume.

Question 2

A sample of titanium has a mass of $$3.7\ \mathrm{g}$$ and a density of $$4.50\ \mathrm{g/cm^3$}. $$What is the volume of the sample in liters?

Accepted Answer

$$0.000822\ \mathrm{L}$$

Question 3

Which of the following is a chemical change?

Accepted Answer

Burning of paper

Question 4

Which of the following elements is a halogen?

Accepted Answer

Bromine

Question 5

How many oxygen atoms are present in the formula $$\mathrm{Al_2$(CO_3$)_3}$$?

Accepted Answer

9

Question 6

Which of the following is the correct chemical formula for an ionic compound made of sodium and sulfur?

Accepted Answer

$$\mathrm{Na_2S}$$

Question 7

A neutral atom of $$\mathrm{Ne}-21 $$would contain how many electrons?

Accepted Answer

10

Question 8

Which of the following best describes a mixture of sand and salt?

Accepted Answer

Mixture – heterogeneous

Question 9

Which of the following elements is expected to have similar chemical properties to sodium ($$\mathrm{Na}$$)?

Accepted Answer

Potassium ($$\mathrm{K})$$

Question 10

Which of the following is an ionic compound?

Accepted Answer

$$\mathrm{Na_2O}$$

Question 11

What is the value of $$125.0^\circ\mathrm{F} in $$degrees Celsius?

Accepted Answer

$$51.7^\circ\mathrm{C}$$

Question 12

Which of the following best describes the process of evaporation of gasoline?

Accepted Answer

Physical change

Question 13

Which of the following ions is a polyatomic ion?

Accepted Answer

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

Question 14

Which of the following is the correct name for the acid $$\mathrm{HI} (aq$$)?

Accepted Answer

Hydroiodic acid

Question 15

Which of the following best describes the composition of an atom?

Accepted Answer

Protons, neutrons, and electrons

Question 16

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

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 17

Which of the following best describes the charge of an ion formed when an atom gains two electrons?

Accepted Answer

2-

Question 18

Which of the following is the correct formula for lead (IV) oxide?

Accepted Answer

$$\mathrm{$$PbO_2$$}$$

Question 19

Which of the following is a property of metals?

Accepted Answer

They are good conductors of electricity.

Question 20

Which of the following best describes the relationship between the net positive and negative charges in an ionic compound?

Accepted Answer

The net positive charge always equals the net negative charge.

Introduction to Chemistry: Practice Exam Study Guide

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