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Physics Core Matey > Heating And Cooling > Flashcards

Heating And Cooling Flashcards

1
Q

How can heat be transferred?

A

Convection
Conduction
Radiation

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2
Q

Kinetic theory of a solid?

A

Arrangement of particles -close together in a regular pattern
Movement of particles-
Vibrate in fixed position

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3
Q

Kinetic theory of a liquid?

A

Arrangement of particles-
Close together but random pattern
Movement of particles-
Move around eachother

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4
Q

Kinetic theory of a gas

A

Arrangement of particles - far apart and random
Movement of particles-
Move quickly in any direction

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5
Q

Which states of matter cannot be compressed ?

A

Liquids and solids

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6
Q

What is a good conductor?

A

Metals

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7
Q

What do you call a poor conductor of heat?

A

Insulator

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8
Q

What happens in conduction (6 marks)

A

The ELECTRONS leave their ATOMS and become FREE ELECTRONS

the parts of the atoms left behind are now CHARGED METAL IONS

this vibrate continually

The hotter the metal , the more KINETIC ENERGY the vibrations have

The kinetic energy goes from the hot to cool parts of a metal by FREE ELECTRONS whilst colliding with IONS

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9
Q

What is a conductor?

A

Material through which energy is transferred easily

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10
Q

What is an insulator?

A

Material through which the speed of transfer of energy is reduced

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11
Q

What happens in convection currents?

A

Heat applied so particles gain energy

Fluid expands

Less dense particles rise to the top

More dense particles drop to the bottom

BOOM CONVECTION CURRENT

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12
Q

What is evaporation?

A

Liquid to gas

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13
Q

What is condensation?

A

Gas to liquid

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14
Q

What factors affect the rate of condensation and evaporation ?

A

Surface area of the liquid

If air is moving over the surface of a liquid

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15
Q

How does an animal reduce heat loss?

A

Have a small surface area to volume ratio

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16
Q

What is a u value?

A

Shows How effective of an insulator something is

17
Q

What is the rule with u values ?

A

Lower the u value , the better the insulator

18
Q

What do solar panels do? (4 marks)

A

Heat energy is taken from the sun

Cold water is pumped to the solar panel

The water is heated by the heat energy in the sun

This then returns to the tank

19
Q

Advantages of solar panels?

A

Renuable

No pollution

20
Q

Disadvantages of solar panels?

A

Don’t work at night

Only very hot in the summer

21
Q

What is the difference between temperature and heat?

A

Temperature (*c) measures how hot something is

Heat (j) measures the amount of thermal energy in an object

22
Q

What does temperature increase depend on?

A

Mass
Substance
Amount of energy transferred

23
Q

More energy transferred means…

A

… Higher the temperature

24
Q

What is specific heat capacity ?

A

Amount of thermal energy needed to raise the temperature of a 1kg substance by 1*c

Physics Core Matey (8 decks)

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