![]() a) A - gas B - liquid C - solid D - liquid E – solidī) C. d) In a sealed container, vapour particles in the space above the liquid return and stick to the surface of the liquid at the same rate as liquid particles are evaporating. Boiling: Attractive forces are broken throughout the liquid to produce bubbles of vapour. c) Evaporation: Some faster moving particles break away from the surface of the liquid. Liquids: particles can move around into vacant spaces, but with some difficulty because of the relatively close packing. Gases should have the particles well spaced.ī) Solids: vibration around a fixed point. Liquids should have most of the particles touching at least some of their neighbours, but with gaps here and there, and no regularity. Note: Solids should have regularly packed particles touching. Answers EDEXCEL INTERNATIONAL GCSE CHEMISTRY EDEXCEL CERTIFICATE IN CHEMISTRY ANSWERS SECTION A Chapter 1 1. ![]()
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