1) which state of matter has the strongest forces between the particals? a) solid b) liquid c) gas 2) What change of state is occurring when particles slow down and move closer together a) freezing b) melting c) boiling d) condensing 3) what is happening to the DENSITY of this substances during this change of state? a) increases b) decreases c) stays the same 4) The definition of internal energy is... a) the amount of energy needed to heat 1kg of a substance by 1ºC b) how close the particals are together c) sum of the potential and kinetic energy of the particles 5) When a substances is heated what happens to the kinetic energy of the particals a) increases b) decreases c) stays the same 6) when a substance boils, how does the internal energy of the gas compare to the internal energy of the liquid a) internal energy is less b) internal energy is more c) internal energy stays the same 7) what happens to the internal energy when a substances freezes a) increases b) decreases c) stays the same 8) When a substance melts what happens to the forces between the particals a) the get stronger b) they get weaker c) they stay the same 9) What has more internal energy, water or ice? a) water b) ice 10) what has more internal energy a cup of tea at 80ºC or a swimming pool of water at 32ºC a) cup of tea b) swimming pool 11) Explain your answer to the last question a) there are less particals in the cup of tea so less potential b) the particals in a cup of tea have more kinetic energy c) There are more particles in the bath tub so there is more kinetic energy 

internal energy

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