Unit 5 Physics

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• Created by: Tasha05
• Created on: 21-04-14 14:42
Specific heat capacity
the heat energy required in joules to increases the temperature of 1 kg of a substance by 1 K (Jkg-1K-1)
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Method of mixtures
heat lost by the hot substance=heat gained by the cold substance mct=mct
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Latent heat
heat required for substance to change state but no change in temp
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Specific latent heat of fusion
the heat required to change the state of 1kg of a material from solid to liquid without temp change
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Specific latent heat of vaporisation
heat required to change the state of 1kg of a material from liquid to gas without a temp change
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Equations for specific heat capacity
Q=mct, Q=VIt, Q=mL, Pt=mL, P=VI
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Boyles' Law
For a fixed mass of gas at constant temp, pressure is inversely proportional to volume
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Charles' Law
For a fixed mass of gas at constant pressure, volume directly proportional to absolute temp
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Pressure Law
for a fixed mass of gas at constant volume, pressure is directly proportional to absolute temp
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Equation of State
pV=nRT as PV/T is a constant
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moles equations
n=no of molecules divide NA and n=m/Mr
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Kinetic theory
molecules move randomly and with differing speeds. As temp increases Ek increases so Crms increases
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Random motion
the speed and direction of any molecule at any instance cannot be predicted
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Assumptions for kinetic theory
diameter of molecules negligible, forces between molecules negligible, random motion, collisions are elastic, steady pressure due to average of random impacts, large number of identical molecules
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Other cards in this set

Card 2

Front

heat lost by the hot substance=heat gained by the cold substance mct=mct

Back

Method of mixtures

Card 3

Front

heat required for substance to change state but no change in temp

Card 4

Front

the heat required to change the state of 1kg of a material from solid to liquid without temp change

Card 5

Front

heat required to change the state of 1kg of a material from liquid to gas without a temp change