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 student is given a sample of 24K gold and a sample of 14K gold. Which statement is correct regarding their classification?

Accepted Answer

24K gold is a pure element; 14K gold is a heterogeneous mixture

Question 3

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

Accepted Answer

Density

Question 4

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

11.75 g/cm³

Question 5

Which separation technique would be most effective for separating sand from saltwater?

Accepted Answer

Filtration

Question 6

Which of the following changes is exothermic?

Accepted Answer

Condensation of steam

Question 7

Which statement best explains why NaCl (table salt) has properties different from both sodium and chlorine?

Accepted Answer

NaCl is a compound, and compounds have properties different from their constituent elements

Question 8

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 9

Which of the following is a chemical property?

Accepted Answer

Reactivity with water

Question 10

Which of the following best describes the Law of Conservation of Energy?

Accepted Answer

Energy can be transformed from one form to another but cannot be created or destroyed

Question 11

How many atoms are present in 0.68 moles of zinc?

Accepted Answer

1.12 × 10²⁴ atoms

Question 12

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

Accepted Answer

Salad

Question 13

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

Accepted Answer

Magnetism

Question 14

Which of the following is an allotrope of carbon?

Accepted Answer

Diamond

Question 15

A 153 g rectangular solid has 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 16

Which of the following best describes a diatomic element?

Accepted Answer

An element that exists as molecules of two atoms

Question 17

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 18

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

Accepted Answer

63.0 moles

Question 19

Which of the following is NOT a method for separating a mixture?

Accepted Answer

Electrolysis

Question 20

Which of the following statements about compounds is correct?

Accepted Answer

Compounds are made of two or more different types of atoms chemically bonded

Foundations of Matter: Classification, Properties, and Quantitative Concepts in General Chemistry

Study Guide - Practice Questions