Energy transfere by heating Flashcards

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0
Q

What is infrared radiation?

A

Infrared radiation is a type of electromagnetic radiation, which involves waves rather than particles

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1
Q

What do all objects emit and absorb?

A

Thermal radiation, also known as infrared radiation

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2
Q

Which is the best surface to emit and absorb infrared radiation?

A

A dark matt surface

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3
Q

Which is the worst emitter and absorber of infrared radiation?

A

Light shiny surfaces

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4
Q

What is the arrangement and movement of particles in a solid?

A

Close together in a regular pattern. Vibrate in a fixed position.

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5
Q

What is the arrangement and movement of particles in a solid?

A

Close together in a random pattern. They move around each other.

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6
Q

What is the arrangement and movement of particles in a gas?

A

Far apart and in a random pattern. They move quickly in any direction.

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7
Q

How can heat energy move through a substance?

A

By conduction

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8
Q

What are poor conductors of heat called?

A

Insulators

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9
Q

What materials are poor conductors?

A

Non-metals and gases

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10
Q

Why are metals good conductors?

A

Because they have free electrons that Cary energy.

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11
Q

Why are non-metals generally poor conductors?

A

Because they rely on atomic vibrations to carry energy

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12
Q

When does convection occur?

A

When particles with a lot of heat energy in an a liquid or gas move and take the place of particles with less heat energy.

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13
Q

How is heat transferred from hot places to cool places?

A

By convection

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14
Q

Why do liquids and gases expand when they are heated?

A

Because the particles move quicker when they are heated than they do when they are cold.

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15
Q

What are evaporation and condensation?

A

Changes of state

16
Q

What is evaporation?

A

The change of state from a liquid to gas

17
Q

Why does evaporation happen?

A

In a well-ventilated room molecules in the air aren’t likely to re-enter a liquid which is warmed by the sun lights, therefore the liquid evaporates.

18
Q

Why does condensation happen?

A

Condensation occurs when particles cool down and are framed into a liquid at a cool surface (such as your window).

19
Q

What are some different forms of energy?

A
Magnetic                  Sound 
Kinetic                      Gravitational potential
Light                         Chemical
Heat                          Electrical
Elastic potential        Nuclear
20
Q

What does an energy transfer diagram show?

A

Show the useful energy transfer
Process
Energy in –> –> Energy output
(Type of energy in) What it is (Type of energy out)

21
Q

What do Sanky diagrams do?

A

Summarise all the energy transfere taking place in a process. The thicker the line or arrow, the greater the amount of energy involved.