Fundamental Ideas in Chemistry
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Why do liquids and gases take the shape of their container?
Particles can move around
Why do solids not take the shape of their container?
Particles cannot move around
Why can gases be squashed easily?
There are big spaces between the particles which can be pushed closer together
Why can’t solids and liquids be squashed easily?
Particles are close so cannot be pushed closer together
What does a sharp melting point signify?
The substance is pure
What does an unsharp melting point signify?
It is a mixture of substances
Solid to gas
Sublimation
Gas to solid
Deposition
Gas to liquid
Condensation
Liquid to gas (below the boiling point)
Evaporation
Why does the temperature of ethanol not change despite it being heated up?
Energy is used to overcome forces between particles rather than to heat it up