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A basic postulate of the kinetic theory of gases is that…

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CHEMISTRY

A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that

A. collisions are perfectly elastic

B. forces of repulsion exist

C. forces of repulsion and attraction are in equilibrium

D. collisions are inelastic.

QUICK ANSWER…

A

SOLUTION 

Elasticity simply means ability to bounce off, and inelasticity on the other hand means ability to stick together after collision.

If we were told that gas molecules move in straight lines in-between collisions, then it implies that they do not stick together after collision, but bounced off in a straight line, they are perfectly elastic.

Now for the right answer to the above question:

  1. Option A is correct. Perfect elasticity simply means ability to bounce off and move in a straight line heading for another (elastic) collision.
  2. Option B is incorrect. if forces of repulsion exist, then they will not collide in the first place.
  3. C is incorrect. if forces of repulsion and attraction are in equilibrium, then the gas molecules will not even move.
  4. D is not the correct answer. If they move in straight lines after collision, then their collision is elastic and not otherwise.

QUICK TIPS…

You may please note these/this:

  • Elasticity simply means ability to bounce off after collision.
  • Inelasticity simply means ability to stick together after collision.

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/ culled from 2018 JAMB-UTME Chemistry question 5 /

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