Thermal Physics - OCR A2 Physics
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Define heat: | A measure of the total thermal energy in a system.
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| Define temperature: | A measure of the average kinetic energy of particles.
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| Define specific heat capacity: | The energy required to raise the temperature of 1kg of substance by 1 degree.
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| Define specific heat of vaporisation: | The energy required to change 1kg of liquid into 1kg of gas at constant temperature.
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| Define internal energy: | The sum of all the kinetic and potential energies of molecules within a substance.
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| What is the pressure law? | At constant volume, pressure is directly proportional to the temperature.
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| What is Boyle's law? | At a constant temperature, pressure and volume are inversely proportional.
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| What is Charles' law? | At a constant pressure, the volume is directly proportional to the temperature.
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| Define pressure: | Force per unit area, it is the result of collisions between particles themselves, or particles and the walls of their container.
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| Give three assumptions used in the kinetic theory of gases: | The gas consists of a large number of molecules. The molecules move randomly. Collisions are elastic.
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| What is the equation for the kinetic energy in a single atom? | KE = 3/2KbT
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| What is the equation for the kinetic energy in a mole? | KE = 3/2nRT
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| What is an absolute scale of temperature? | A temperature scale measured from absolute zero in kelvins.
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| What changes and what remains constant during a change in state of a system? | The internal energy changes, the temperature doesn't.
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| What is Brownian motion? | The observation of random motion in air/smoke particles. The experiment saw the smoke particles appear as bright specks moving in a completely random motion.
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| What happens to a gas as the temperature increases? | The average speed increases, the maximum speed increases, and there is a wider range of speeds.
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| What is an ideal gas? | A gas that has internal energy only in the form of random kinetic energy.
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Created by:
Sparksy
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