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Particle Model of Matter
Terms in this set (22)
What are the three main states of matter?
Three states of matter are; solid, liquid and gas.
What are the properties of the particles in a solid?
Strong force of attraction, vibrate on the spot, fixed pattern, cannot be compressed and cannot take the shape of a container
What are the properties of the particles in a liquid?
Weak force of attraction, can move over each other, cannot be compressed and can take the shape of a container
What are the properties of the particles in a gas?
Very weak force of attraction, can move freely, can be compressed and can take the shape of a container
What happens to the mass during a change in state?
Mass is conserved (stays the same) during a change in state.
What is a physical change?
Material can recover original properties if the change is reversed. (E.g. change in state)
What is meant by the term density?
Density is the amount of matter in a volume.
What is the equation for density?
Density (kg/m3) = mass (kg) / volume (m3) [P = m/V]
What is the particle model used for?
Explain different states of matter and to explain differences in density
What is a system?
Substance effected by the change.
What is meant by the term internal energy?
Total kinetic and potential energy of all particles (atoms/molecules) in a system.
What effect does heating have on a system?
Kinetic energy increases and internal energy increases (Particles move more or temperature increases or change in state)
What is meant by the term latent heat?
Energy needed for a substance to change state.
What happens to the temperature when a change in state occurs?
Temperature stays the same. Particles energy store changes.
What is the equation used to calculate latent heat?
Energy for change in state (J) = mass (kg) x specific latent heat (J/kg) [E = mL]
What is specific latent heat of fusion?
Specific latent heat of fusion is change of state from solid to liquid.
What is specific latent heat of vaporisation?
Specific latent heat of fusion is change of state from liquid to gas (vapour)
What is pressure?
Pressure is force exerted by particles in a gas.
If a gas is held at a constant volume how would you change its pressure?
Changing the temperature would change the pressure.
Explain why heating a gas increases its pressure?
Kinetic energy increases, internal energy increases, particles move more, particles hit the surface more and pressure increases
Explain why cooling a gas decrease its pressure?
Kinetic energy decreases, internal energy decreases, particles slow down, less particles hit the surface and pressure decreases
What is the equation for a fixed mass of gas held at a constant temperature?
Pressure x volume = constant [pV = constant]
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