Matter, Elements and Compounds — O/L Science

How do I practise Matter, Elements and Compounds?

1 question with a worked solution · 5 marks

1. 2022 · Paper II · 5 marks
   Question 3 asks you to explain from particle theory why a gas fills its whole container while a liquid takes the container's shape but keeps a fixed volume, and to include a labelled particle diagram for each state.
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   In a GAS: particles are far apart, move rapidly and randomly, exert negligible attractive forces on each other. They spread to fill all available space — hence fill the container fully. In a LIQUID: particles are close together with moderate attractive forces. They can slide past each other (flow) so the liquid conforms to the container shape. The volume is fixed because particles cannot easily escape the attraction of neighbours. Diagram: Gas — particles spread throughout box; Liquid — particles close together, no fixed arrangement but with a flat surface at the top.
   Source: Department of Examinations, Sri Lanka — G.C.E. O/L Science 2022, Paper II, Question 3 · https://doenets.lk/pastpapers

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