Diffusion Quiz
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5 questions, one answer each
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1. What is diffusion?
- A. The net movement of particles from low to high concentration
- B. The net movement of particles from high to low concentration
- C. The vibration of particles in a fixed position
- D. The forced mixing of particles by stirring
2. In which state of matter does diffusion occur fastest?
- A. Solid
- B. Liquid
- C. Gas
- D. It is the same speed in all states
3. Why does diffusion not occur in solids?
- A. Solid particles have no kinetic energy at all
- B. Solid particles are fixed in position and only vibrate
- C. Solids are always at a very low temperature
- D. Solid particles repel each other strongly
4. Ammonia (NH3, Mr = 17) and hydrogen chloride (HCl, Mr = 36.5) gases are released from opposite ends of a tube. Where does the white ring of ammonium chloride form?
- A. Exactly in the middle of the tube
- B. Closer to the ammonia end
- C. Closer to the hydrogen chloride end
- D. No ring forms because the gases do not react
5. A sealed rigid container of gas is heated. Using kinetic particle theory, what happens to the pressure inside the container?
- A. Pressure decreases because particles slow down
- B. Pressure stays the same because volume is fixed
- C. Pressure increases because particles move faster and collide with the walls more often and with more force
- D. Pressure becomes zero because the gas turns to liquid