A student in Barbados compresses air in a bicycle pump. According to the kinetic theory, which statement explains why gases can be compressed but liquids cannot?

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Question

A student in Barbados compresses air in a bicycle pump. According to the kinetic theory, which statement explains why gases can be compressed but liquids cannot?

Accepted Answer

Gas particles have large spaces between them while liquid particles are already close together — Award 1 mark for explaining that gas particles have large spaces between them which can be reduced under pressure, while liquid particles are already close together with minimal space between them. A is incorrect — particle size does not determine compressibility. C is incorrect — particle mass is irrelevant to compressibility. D is incorrect — both gas and liquid particles are in constant motion.

Answer

Gas particles are smaller than liquid particles

Answer

Gas particles do not move but liquid particles do

Answer

Gas particles have large spaces between them while liquid particles are already close together

Answer

Liquid particles are heavier than gas particles

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