Physics Particle

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  • Created by: florrie
  • Created on: 24-02-18 10:42
Whats the density equation?
Density = mass / volume
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Density of states of matter
In solid the molecules are densely packed and are not able to move freely. In a liquid they are less dense and more loosely packed. In gas the molecules are the least dense and can spread out
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How are physical changes differnet from chemical
Changes of state are physical changes and are different from chemical changes because the material recover its original properties if the change is reversed
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what is internal energy?
Internal energy Is energy is stored inside a system by the particles (atoms + molecules) that make up the system
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equation of internal energy
Internal energy = kinetic energy + potential energy
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What does heating do to the system.
Heating changes the energy stored within the system by increasing the energy of the particles that make up the system. Heating either raises the temperature of the system or produces a change of state
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what does thermal insulation do?
Thermal insulation can reduce unwanted energy transfers
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What happens to the rate of energy when the higher the thermal conductivity?
The higher the thermal conductivity of a material the higher the rate of energy transfer by conduction across the material
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How is the rate of cooling of a building affected?
The rate of cooling of a building is affected by the thickness and thermal conductivity of its walls
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When the temperature of the system increases, what does the increase in temperature depend on?
If the temperature of the system increases, the increase in temperature depends on the mass of the substance heated, the type of material and the energy input to the system
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equation of change in thermal energy
Change in thermal energy = mass x specific heat capacity x temperature change
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what is specific heat capacity measure in?
Specific heat capacity, c, is measure in joules per kilogram per degree Celsius, J/kg C
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What is specific heat capacity?
Specific heat capacity of a substance is the amount of energy required to raise the temperature of one kilogram of the substance by one degree Celsius
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what is the energy needed to change state called?
If a change of state happens the energy needed for a substance to change state is called latent heat
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when a change of state occurs the energy supplied changes what?
When a change of state occurs, the energy supplied changes the energy store (internal energy) but not the temperature
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What is specific latent heat?
The specific latent heat of a substance is the amount of energy required to change the state of one kilogram of the substance with no change in temperature
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equation for energy for a change of state
Energy for a change of state = mass x specific latent heat x temperature change
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What is specific latent heat measured in?
Specific latent heat, L, is measure in joules per kilogram, J/kg
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The specific latent heat of fusion applies to what?
The specific latent heat of fusion applies for a change of state from solid to liquid
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The specific latent heat of vaporisation applies to what?
Specific latent heat of vaporisation applies for change of state from liquid to vapour
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the temperature of gas is related to what?
Molecules of a gas are in constant random motion. The temperature of the gas is related to the average kinetic energy of the molecules
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What does changing the temperature of a gas change?
Changing the temperature of a gas, held at a constant volume, changes the pressure exerted by the gas
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The hotter the molecule the what?
The hotter the molecule the faster it moves, and the collisions become harder and more frequent and mans the pressure increases
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What are directly proportional at a constant temperature?
Pressure and temperature are directly proportional at a constant temperature
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Other cards in this set

Card 2

Front

Density of states of matter

Back

In solid the molecules are densely packed and are not able to move freely. In a liquid they are less dense and more loosely packed. In gas the molecules are the least dense and can spread out

Card 3

Front

How are physical changes differnet from chemical

Back

Preview of the front of card 3

Card 4

Front

what is internal energy?

Back

Preview of the front of card 4

Card 5

Front

equation of internal energy

Back

Preview of the front of card 5
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