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JC Science > Chapter 38 - Heat > Flashcards

Chapter 38 - Heat Flashcards

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1
Q

What happens to materials when they are heated?

A

They expand

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2
Q

What happens to materials when they are cooled?

A

They contract

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3
Q

Above __°C water behaves like other liquids

A

Above 4°C water behaves like other liquids

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4
Q

Below __°C water behaves oppositely to other liquids

A

Below 4°C water behaves oppositely to other liquids

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5
Q

What happens to the boiling point of water when you reduce the pressure

A

The water boils below 100°C

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6
Q

What happens to the boiling point of water when you increase the pressure?

A

The water boils above 100°C

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7
Q

What is temperature?

A

The measure of the hotness of a body

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8
Q

What is the unit for temperature?

A

Degree Celsius °C

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9
Q

What is latent heat?

A

Latent heat causes a change in state and not a change in temperature

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10
Q

What is latent heat of fusion?

A

When heat changes a solid to a liquid with no temperature change

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11
Q

What is latent heat of vaporisation?

A

When heat changes a liquid to a gas with no change in temperature

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12
Q

In what three methods can heat travel?

A
  • Conduction
  • Convection
  • Radiation
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13
Q

What are insulators?

A

Materials that are poor conductors of heat

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14
Q

How does heat travel through solids?

A

Conduction

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15
Q

How does heat travel through liquids?

A

Convection

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16
Q

True or false? Heat travelling by radiation requires a medium to travel in?

A

False- radiation does not require a medium

17
Q

What is heat?

A

A form of energy

18
Q

Give examples of heat making things move

A
  • Steam engines
  • In power stations, oil and gas are burned to produce heat
  • Photosynthesis in plants
19
Q

Why does the bimetallic stop bend when heated?

A

This is because materials expand at different rates, therefor when one metal starts to expand it pushes the other on sideways

20
Q

What can a bimetallic strip be used for?

A

Switching on and off electrical circuits

JC Science (44 decks)

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