$$4.09 \times 10$$^{23}$$ atoms

Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Sand and iron filings

Question 2

A sample of lead (Pb) has a mass of 22.7 g and occupies a volume of 2.0 cm$$^3. $$What is the density of the sample?

Accepted Answer

$$11.35\ \mathrm{g/cm}^3$$

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Reactivity with water

Question 4

Which statement best describes an element?

Accepted Answer

A substance that contains only one type of atom

Question 5

A 119.5 g solid cylinder has a radius of 1.8 cm and a height of 1.5 cm. What is its density? (Use $$V = \pi r^2$ h)$$

Accepted Answer

$$7.86\ \mathrm{g/cm}^3$$

Question 6

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 7

Which process is best for separating a mixture of sand and iron filings?

Accepted Answer

Magnet

Question 8

A 153 g rectangular solid has edge lengths 8.2 cm, 5.1 cm, and 4.7 cm. Will this object sink in water? (Density of water = $$1.00\ \mathrm{g/cm}^3)$$

Accepted Answer

Yes, because its density is greater than water

Question 9

Which of the following changes is exothermic?

Accepted Answer

Water freezing

Question 10

How many atoms are in 0.68 moles of zinc?

Accepted Answer

$$4.09 	imes 10$$^{23}$$ atoms

Question 11

Which of the following best describes a compound?

Accepted Answer

A substance that contains two or more types of atoms chemically bonded

Question 12

A sample of butane (C$$_4H$_{10}) $$contains 288 g carbon and 60 g hydrogen. What is the total mass of the sample?

Accepted Answer

348 g

Question 13

Which of the following is a physical change?

Accepted Answer

Melting ice

Question 14

Which method would best separate a solution of salt dissolved in water?

Accepted Answer

Distillation

Question 15

Which of the following is a diatomic element in its natural state?

Accepted Answer

O$$_2$$

Question 16

A 550 g sample of chromium(III) oxide (Cr$$_2O$_3) $$has 376 g Cr. How many grams of Cr are in a 212 g sample of Cr$$_2O$_3$$?

Accepted Answer

145 g

Question 17

Which of the following is an example of an allotrope?

Accepted Answer

O$$_2$$ and O$$_3$$

Question 18

Which of the following is a homogeneous mixture?

Accepted Answer

Bronze

Question 19

Which law states that matter cannot be created or destroyed in a chemical reaction?

Accepted Answer

Law of Conservation of Mass

Question 20

Which of the following is a physical property?

Accepted Answer

Malleability

Introduction to Matter, Classification, and Basic Quantitative Concepts in Chemistry

Study Guide - Practice Questions