Ch.2

Question 1

What happens to a liquid when it is heated?

Answer 1

The liquid expands, causing its level to rise

This is due to heat expansion.

Question 2

What happens to a liquid when it is cooled?

Answer 2

The liquid contracts, causing its level to fall

This is due to heat contraction.

Question 3

What do thermometers use to show temperature changes?

Answer 3

Heat expansion and contraction

The liquid inside the thermometer responds to temperature changes.

Question 4

Fill in the blank: When the thermometer is heated, the liquid inside ______, so its level ______.

Answer 4

expands; rises

Question 5

Fill in the blank: When the thermometer is cooled, the liquid inside ______, so its level ______.

Answer 5

contracts; falls

Question 6

What is the primary mechanism of heat transfer in objects?

Answer 6

Heat is transferred from the hotter part to the colder part

This process occurs in all materials.

Question 7

Which materials are considered good conductors of heat?

Answer 7

Metals

Metals transfer heat quickly.

Question 8

Which materials are considered poor conductors of heat?

Answer 8

Most non-metals

They transfer heat slowly.

Question 9

Why should we use poor conductors of heat to hold hot objects?

Answer 9

To avoid burns

Poor conductors help prevent heat transfer.

Question 10

What happens to materials like metals and air when heated?

Answer 10

They expand

This is a general property of materials when subjected to heat.

Question 11

What happens to materials like metals and air when cooled?

Answer 11

They contract

This is a general property of materials when subjected to cooling.