Heat And Temp. Key Words Topic 4-6

Question 1

Expand

Expansion

Answer 1

A substance that grows or increases in the volume. Example marshmallows heated in the microwave

Question 2

Contraction

Contract

Answer 2

A substance that shrinks or decreases in size or volume.

Example mountain bike tires deflate during the winter

Question 3

Heat capacity

Answer 3

The amount of heat required to warm a cooling object by 1°. Sunlight shines down equally on the sand and water. temperature the sand and water will change quite differently
Example sand

Question 4

Particle model

Answer 4

When the temperature increases the particles are moving faster and spreading more

higher temperature equals high movement spreading out

when the temperature decreases the particles are moving slower and getting closer together

Lower temperature equals lower movement closer together

Question 5

A pure substance is a type of ……… that is made of only one kind of particle pure substances can exist as ………, …….. or ………..

Answer 5

Matter
Solid
liquid
gas

Question 6

Do a solid expand of the same rate?

Answer 6

Solids can be longer or shorter depending on the temperature

average energy of the particles

Question 7

Do liquids expand and contract at the same rate?

Answer 7

When particles are heated there average energy increases needing more room so they expand.

When particles are cooling the volume decreases or contracts because the particles need less room

Example this is demonstrated by the liquid used in a thermometer as the liquid expands and contracts and moves up and down the inside tubing of the thermometer

Question 8

What is the fourth state of matter

Answer 8

Plasma

it is made of an extreme temperatures like those on the surface of the sun 🌞