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Whats the best colour for a central heating radiator, glossy white or dull black?
Dull black
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Why does a solid have a fixed position?
all the particles are held together in fixed positions
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when a liquid evaporates why is the average kinetic energy of the remaining molecules reduced?
The most energetic molecules leave the liquid, so the kinetic energy of the remaining molecules is less.
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What happens to the rate of energy transfer between an object and its surroundings if the temperature difference between them is reduced?
if the temperature is reduced, the rate of energy transfer decreases
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which type of energy transfer involves particles?
conduction, convection and evaporation
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How does energy from the sun reach the earth?
it reaches the earth as radiation that travels through space
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How does the colour of a surface affect the rate of conduction?
no effect
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why are gases poor conductors?
The particles are too far apart
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Why are metals the best conductors?
They contain free electrons
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What is convection?
the movement of energy through a fluid by movement of the fluid itself
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How does cavity wall insulation reduce energy transfer from a house?
It traps the air in the cavity in pockets preventing convection currents being set up
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The specific heat capacity of water is 4200j/kg°C. How much energy is needed to raise the temperature of 3kg of water by 4°C?
50400J
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Other cards in this set

Card 2

Front

Why does a solid have a fixed position?

Back

all the particles are held together in fixed positions

Card 3

Front

when a liquid evaporates why is the average kinetic energy of the remaining molecules reduced?

Back

Preview of the front of card 3

Card 4

Front

What happens to the rate of energy transfer between an object and its surroundings if the temperature difference between them is reduced?

Back

Preview of the front of card 4

Card 5

Front

which type of energy transfer involves particles?

Back

Preview of the front of card 5
View more cards

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