Changing from a solid to a gas without going through the liquid state.
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What two changes happen when a material is heated or cooled?
Chemical bonds are either formed or broken and particles either increase or decrease in speed.
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What happens to the energy store of a material as a solid changes to a gas?
The internal energy increases.
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Explain the conservation of energy?
The conservation of energy states that assuming no energy is lost to the surrounding area, all energy should be transferred to a material and distributed between the chemical and thermal stores of the internal energy
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Explain the conservation of mass?
The conservation of mass states that when substances change states, mass is conserved.
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Define internal energy
Internal energy is a measure of the total energy of all particles in a object
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What two stores of energy add together to equal the internal energy?
Kinetic energy store + potential energy store = internal energy
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What is the equation for change in thermal energy?
Change in thermal energy = mass x specific heat capacity x change in temperature
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What happens when a hot object is in contact with a cold object?
The hot object transfers energy to the cold object until both are at the same temperature
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Define specific heat capacity
The energy required for a 1 degree change in temperature is know as specific heat capacity
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Define specific latent heat
Specific latent heat is the amount of energy required to change state of 1kg of material without changing its temperature
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Define latent heat of fusion
the amount of energy required to freeze or melt the material at its melting point
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Define latent heat of vaporisation
the amount of energy required to evaporate or condense the material at its boiling point
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What is the equation for change in thermal energy (including specific latent heat)?
Change in thermal energy = Specific latent heat x mass
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Name the equation for pressure?
Pressure = force / area
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What is the relationship between temperature and pressure in gases?
Assuming that the volume stays the same as temperature increases, pressures increases or temperature is proportional to pressure
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What is the relationship between pressure and volume in gases?
Assuming that the temperature stays the same when pressure increases the volume decreases or pressure is inversely proportional to volume
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What two factors increase pressure?
increasing the temperature and decreasing the volume
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Other cards in this set
Card 2
Front
Define sublimnation
Back
Changing from a solid to a gas without going through the liquid state.
Card 3
Front
What two changes happen when a material is heated or cooled?
Back
Card 4
Front
What happens to the energy store of a material as a solid changes to a gas?
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