Summary: Chemistry For Igcse | 9781408500187 | Roger Norris, et al
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Read the summary and the most important questions on Chemistry for IGCSE | 9781408500187 | Roger Norris, Roger Stanbridge ; Series editor, Lawrie Ryan.
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1 Particles and Purification
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1.1 solids, liquids and gasses
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What are the three states of matter
Solids, liquids and gasses -
What is the particle arrangement of a solid
The arrangement of a solid is a fixed pattern. The particles only vibrate and are close together -
What is the particle arrangement of a gas
The arrangement of a gas is random. Particles move everywhere rapidly and they are far apart -
In which changes of state does energy need to be put in
Melting and evaporating -
In which changes of state does energy need to be given out
Freezing and condensing -
1.2 diffusion
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What is the kinetic particle theory
The kinetic particle theory states that molecules in solids, liquids and gasses are always moving -
Why is diffusion faster in a gas than a liquid
In gases the particles move rapidly and in liquids move slowly. -
Why does diffusion not occur in solids
Because particles in solids are tightly packed together, although they do vibrate they cannot move -
What decides the speed of diffusion
Th speed of diffusion depends on how heavy a molecule is. Substances with a high relative molecular mass diffuse slowly and substances with a low molecular mass diffuse faster -
1.3 apparatus for measuring
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What are the units for mass, temperature and volume in chemistry
Grams, C* and cm3 or dm3
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