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In the figure below, ammonia gas and an acid gas diffuse and react to form a white deposit on the walls of a long glass tube as shown.
F3 ET1 P1 Q15d

  1. What conclusion can be made from the result of this experiment? 
  2. How does the size and mass of a gas affect its rate of diffusion? 
  3. The experiment is performed at a lower temperature. Explain how the time taken to form the white deposit would be affected. 

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  1. Ammonia gas particles diffuse faster than acid gas particles.
  2. The smaller the size of particles and the smaller the mass, the faster the rate of diffusion. 
  3. It takes longer time because the kinetic energy of particles is reduced i.e particle move at a lower speed
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