$$\text{Density} = \frac{\text{Mass}}{\text{Volume}}$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance made of two or more different elements chemically bonded together.

Question 2

Which property is intensive and does NOT depend on the amount of substance present?

Accepted Answer

Density

Question 3

A student mixes sand and salt in water. Which statement best describes the resulting mixture?

Accepted Answer

It is a mixture because the components can be separated physically.

Question 4

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

Accepted Answer

Burning wood

Question 5

Which statement correctly distinguishes between an element and a compound?

Accepted Answer

Elements are made of one kind of atom, while compounds are made of two or more different elements bonded together.

Question 6

A sample of gold is cut into two pieces. Which property remains unchanged?

Accepted Answer

Density

Question 7

Which of the following best describes the atom?

Accepted Answer

The basic unit of matter.

Question 8

Which process is a physical change?

Accepted Answer

Evaporating alcohol

Question 9

A chemist measures the mass and volume of a liquid to calculate its density. Which formula should be used?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 10

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 11

A student observes that melting ice does not produce a new substance. What type of change is this?

Accepted Answer

Physical change

Question 12

Which of the following statements about mixtures is correct?

Accepted Answer

Mixtures can be separated by physical means.

Question 13

Which scenario best illustrates an intensive property?

Accepted Answer

The density of water remains the same regardless of the amount.

Question 14

Which of the following is a correct statement about physical and chemical changes?

Accepted Answer

Physical changes do not change the composition of matter.

Question 15

A sample contains only $$Na$$ atoms. What type of substance is this?

Accepted Answer

Element

Question 16

Which of the following is an example of a mixture?

Accepted Answer

Brass (an alloy of copper and zinc)

Question 17

A patient receives oxygen gas in a hospital. Which statement is true about the oxygen?

Accepted Answer

It is an element because it contains only oxygen atoms.

Question 18

Which of the following is a correct example of a chemical change in a real-world scenario?

Accepted Answer

Silver tarnishing when exposed to air

Question 19

A student wants to separate a mixture of sand and salt. Which method should be used first?

Accepted Answer

Add water to dissolve the salt, then filter out the sand.

Question 20

A chemist has a 50 g sample of ethanol with a volume of 63.5 mL. What is the density of ethanol in $$g/mL$$?

Accepted Answer

$$0.79\ g/mL$$

Introduction to Matter and Its Properties

Study Guide - Practice Questions