Electricity
- Created by: JLIMBERT
- Created on: 30-01-19 20:33
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- Particle Model Of Matter
- Density
- Density = Mass/Volume (m/V)
- The amount of mass in a volume.
- Tells us how tightly matter is packed together
- Why can you compress a gas but not a solid?
- Gases are far apart and have space between their particles. Also their particles move randomly.
- Solids are in fixed positions, and have a strong attraction. They can't move too.
- State of Matter
- Properties of a solid
- High density
- can vibrate
- Fixed positions
- Held together
- Properties of a liquid
- Move around
- Medium density
- Random
- Can't squash
- Properties of a gas
- No shape
- particle move randomly
- Can be squashed
- Low density
- Particles are far apart
- Conservation of Mass
- Despite chemical reactions or physical transformation mass is conserved
- It cannot be created or destroyed
- Changing state is a physical change
- Properties of a solid
- Specific Latent Heat
- Latent heat is the amount of heat energy transferred to a substance when it changes state.
- Specific latent heat is the amount of heat energy required to change the state of 1kg of a substance
- SLH of fusion is a solid to a liquid (melting)
- SLH of vaporisation is a liquid to a gas (boiling)
- SLH (J/KG) = Energy(J) / Mass(KJ)
- Eternal Energy
- Particles in a system vibrate or move around
- They have energy in their kinetic energy stores.
- The faster they move, the greater the kinetic energy store.
- The particles also have energy in their potential energy store.
- The total energy that particles in a system is equal to the sum of kinetic and potential energy stores.
- We call this total energy, the internal energy of the system.
- Particles in a system vibrate or move around
- Density
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