# P1A

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• Created by: ellxe
• Created on: 30-04-16 21:32
What is heat a measure of?
Energy
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When a substance is heated, what do particles gain?
Kinetic energy
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What is temperature a measure of?
The average kinetic energy of particles in a substance
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Where does energy flow from and to?
From hot objects to cooler ones 'if theres a difference in temp between 2 places then energy will flow between them'. Greater difference = faster rate of cooling
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What does specific heat capacity do and what is it?
Tells you how much energy stuff can store. It is the amount of energy needed to raise the temp of 1kg of a substance by 1 degree
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What is the equation using specific heat capacity?
Energy = Mass X Specific Heat Capacity X Temperature Change
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What are the flat parts on a heating graph? (see pg 11 if confused)
Boiling and melting
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What are the flat parts on a cooling graph? (see pg 11 if confused)
Condesing and freezing
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What is the specific latent heat of boiling?
The energy needed to boil 1kg of material without changing its temperature.
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What is the specific latent heat of melting?
The amount of energy needed to melt 1kg of material without changing its temperature
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Specific latent heat equation?
Energy = Mass X Specific Latent Heat
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Where does conduction ocur?
Mainly in solids
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Definition of conduction?
Conduction of heat is the process where vibrating particles pass on extra kinetic energy to neighbouring particles
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Where does convection occur?
Only liquids and gases
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Definition of convection?
Convection occurs when the more energetic particles move from teh hotter region to the cooler region - and take their heat energy with them
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Convection currents
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How do we get heat from the sun?
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Does radiation need a medium to travel through?
No. It can occur in a vaccum
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Do all objects emit and absorb heat radiation?
Yes
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What surfaces are good for absorbing and emitting radiation?
Matt black
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Light smooth shiny
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Why is heat radiation important in cooking?
Food is heated on the surface by radiation and then passed through by conduction or convection
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## Other cards in this set

### Card 2

#### Front

When a substance is heated, what do particles gain?

Kinetic energy

### Card 3

#### Front

What is temperature a measure of?

### Card 4

#### Front

Where does energy flow from and to?

### Card 5

#### Front

What does specific heat capacity do and what is it?