Question 1

Which of the following best describes an alloy such as brass?

Accepted Answer

A homogeneous mixture of two or more metals

Question 2

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 π ≈ 3.14)

Accepted Answer

11.8 g/cm³

Question 3

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

Accepted Answer

Melting point

Question 4

Which process would best separate a mixture of sand and iron filings?

Accepted Answer

Using a magnet

Question 5

Which of the following statements about compounds is correct?

Accepted Answer

Compounds contain two or more types of atoms chemically bonded

Question 6

A student has a 153 g rectangular solid with edge lengths 8.2 cm, 5.1 cm, and 4.7 cm. Will it sink or float in water? (Density of water = 1.00 g/cm³)

Accepted Answer

It will sink because its density is greater than water

Question 7

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

Accepted Answer

Density

Question 8

Which change of state is endothermic?

Accepted Answer

Melting

Question 9

How many atoms are present in 0.68 moles of zinc?

Accepted Answer

1.12 × 10²⁴ atoms

Question 10

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

Accepted Answer

Homogeneous mixtures have uniform composition throughout, while heterogeneous mixtures do not

Question 11

Which of the following is an example of a diatomic element?

Accepted Answer

Oxygen (O₂)

Question 12

A sample of lead has a mass of 22.7 g and a volume of 2.0 cm³. What is its density?

Accepted Answer

11.35 g/cm³

Question 13

Which of the following is a chemical property?

Accepted Answer

Reactivity with water

Question 14

Which separation technique would be most effective for separating a solution of salt dissolved in water?

Accepted Answer

Distillation

Question 15

Which of the following statements about the law of conservation of energy is correct?

Accepted Answer

Energy cannot be created or destroyed, only transformed

Question 16

How many moles are in 3.79 × 10²⁵ atoms of zinc?

Accepted Answer

63.0 moles

Question 17

Which of the following is an example of an allotrope?

Accepted Answer

Diamond and graphite (both forms of carbon)

Question 18

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more types of atoms chemically bonded

Question 19

Which of the following changes is exothermic?

Accepted Answer

Freezing of water

Question 20

A 24K gold ring is classified as which of the following?

Accepted Answer

A pure element

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

Study Guide - Practice Questions