P1.2 Changes of State
- Created by: Jadeprigtale
- Created on: 04-11-18 17:24
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- P1.2 Changes of State
- Density
- Tells you how much mass there is in a certain volume
- Substances are denser in the solid state than gas state as there are more particles
- Law of conservation of mass: particles do not appear or disappear
- Energy and Temperature
- Energy is measured in Joules
- Depends on arrangement and movement of the particles
- Temperature is measured in Degrees Celsius or Kelvin
- Average kinetic energy of the particles
- Heating can...
- Change energy stored within the system to increase the temperature
- Produce a physical change
- Particles rearrange, reversible
- Produces no new susbtances
- Produce a chemical change
- Atoms break up, then join together in different ways, irreversible
- Produces new substances
- Energy is measured in Joules
- Specific Heat Capacity
- Energy needed to raise the temperature of 1kg of a material by 1K
- Depends on:
- The type of material
- The mass of the material
- The temperature rise
- Heating increases the internal energy of the material
- Refers to the motion, vibration and arrangement of particles
- Tells you how resistant a material is
- High specific heat capacity = more resistant
- Specific Latent Heat
- When there is a change of state, there is no temperature rise
- The internal energy is increasing, but the temperature is not
- Specific Latent Heat of Fusion (or metling)
- Energy transferred when 1kg of a substance changes from the solid state to the liquid state (or vice versa)
- Specific Latent Heat of Evaporation
- Energy transferred when 1kg of a substance changes from liquid to gas
- When there is a change of state, there is no temperature rise
- Density
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