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13 Cards in this Set
- Front
- Back
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What is the specific heat capacity of a substance?
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The amount of energy needed to raise the temperature of 1kg of a substance by 1 K without a change of state.
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What does the temperature rise/fall (∆θ) of an object depend on?
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1. the heat energy (E) supplied/extracted
2. the mass (m) if the object 3. the material of the object, specific heat capacity (c) |
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What impact does a smaller mass have on the heating of an object?
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The smaller the mass the greater the temperature rise with the same amount of heat supplied.
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What is the formula for the amount of energy which must be supplied to a mass with a known specific heat capacity to produce a certain temperature rise?
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E = mc∆θ
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Describe an experiment to measure the specific heat capacity of a solid.
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EQUIPMENT: thermometer, immersion heater, ammeter, voltmeter, low voltage d.c. supply, metal block, insulation
METHOD: weigh mass, record v(1) and I(1), record change in temp of block in fixed time, repeat with different v(2) and I(2) ensuring block has cooled to room temp, use simultaneous equations to find value for c |
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What is latent heat?
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The heat energy which a body will absorb during melting or evaporation or gives out during solidification or condensation.
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What is the latent heat of fusion?
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The heat supplied/extracted to cause the phase change from solid to liquid (or vice-versa) without a change of temperature.
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What is the latent heat of vapourisation?
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The heat supplied/extracted to cause the phase change from liquid to vapour (or vice versa) without a change of temperature.
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What is the specific latent heat of fusion of a substance?
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The energy needed to change 1kg of the substance from solid to liquid (or vice versa).
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What is the specific latent heat of vapourisation of a substance?
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The energy needed to change 1kg of the substance from liquid to gas (or vice versa).
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What is the formula for the energy that must be supplied to cause a change of state in a mass of a substance having a specific latent heat?
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E = mL
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What is evaporation?
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The process by which a liquid changes state into a gas or vapour. It occurs at any temperature and only from the liquid surface.
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What is boiling?
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A special case of evaporation which occurs at a specific temperature (the boiling point) and throughout the liquid volume. Bubbles of vapour form inside the liquid, rise to the surface and burst releasing vapour into the atmosphere.
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