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^Note to all students: Click on the '+' sign above this pinned post to add your post. :)

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I’ve learnt that some gases can turn from solid to gaseous state directly by sublimation

I’ve learnt that you can obtain pure form of substances using cystalisation.

I still don’t understand how the temperature changes during distillation.

I’ve learnt that ice can float on water because it has a special structure making it more expanded thus making it less dense than water.

I’ve learnt that diffusion can occur in a vacuum.

I still don’t understand vapour desposition.

I still dont understand how

1. how to collect gases

2. how to dry gases

3. how to obtain a pure substance

1. Heating curve

2. Cooling curve

3. What happen to particles during expansion and contraction

2.I have learnt how to separate solid-liquid mixtures.

3.I have learnt how to separate liquid-liquid mixtures.

2.I have learnt what a heating curve is.

3.I have learnt what a cooling curve is.