Test 2/19

Question 1

What is a conductor?

Answer 1

A material that conducts heat well

Examples of conductors include silver and the floor.

Question 2

What are insulators?

Answer 2

Materials that do not conduct heat well

Examples of insulators include air and wool.

Question 3

True or false: The temperature rises at the same rate for all materials.

Answer 3

FALSE

The amount of heat required to raise the temperature of a material depends on the material’s chemical makeup.

Question 4

Fill in the blank: The amount of heat required to raise the temperature of a material depends on the material’s _______.

Answer 4

chemical makeup

This indicates that different materials respond differently to heat.

Question 5

The amount of energy required to raise the temperature of a 1kg of a material by 1 Kelvin or 1 degree Celsius is called its _______.

Answer 5

Specific Heat

Specific heat is measured in Joules per kilogram per Kelvin (J/(kg-K)).

Question 6

What is the specific heat of water?

Answer 6

4,180 J/(kg-K)

Water has a high specific heat, making it take longer to heat up compared to other materials.

Question 7

What happens to matter when it is heated?

Answer 7

It expands - thermal expansion

This phenomenon is known as thermal expansion, where particles spread out, causing the matter to get bigger.

Question 8

When matter is cooled, what happens to its volume?

Answer 8

It contracts

Cooling causes matter to contract, reducing its volume.

Question 9

Give an example of thermal expansion in real life.

Answer 9

Expansion joints on bridges in summer and contraction in winter

In summer, bridges expand, and in winter, they contract to ensure safety.

Question 10

What is friction a form of?

Answer 10

Thermal energy

Question 11

Specific Heat of Aluminum, Silver, and Iron

Answer 11

Aluminum 900 joules/kg•K
Silver 235 joules/kg•K
Iron 450 joules/kg•K

Question 12

Some objects lose kinetic energy due to

Answer 12

Friction

Question 13

Thermal energy equation

Answer 13

TE= mass x Cp (specific heat) x change in temperature

Question 14

Real life examples of thermal expansion

Answer 14

metal jar lids loosen under hot water, railway tracks and bridges use expansion joints to prevent buckling, liquid thermometers rise when heated, and power lines sag in summer