Gas Particles and Diffusion Worksheet

Question 1

A small amount of tracer gas starts at one end of a sealed container. What happens as diffusion proceeds?

1. It spreads through the container.
2. It permanently remains at the starting end.
3. All tracer particles stop moving.
4. The tracer particles combine into one large particle.

Question 2

A student says each tracer particle must move directly toward a region of lower concentration. Explain what actually produces net spreading.

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Question 3

What is true after the tracer concentration becomes uniform?

1. Particles still move randomly.
2. All particles stop moving.
3. The tracer vanishes.
4. Tracer molecules all move in the same direction.

Question 4

How does warming a sample of the same gas affect its average kinetic energy and particle speed?

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Question 5

Which comparison isolates the effect of temperature on the measured arrival time?

1. P with Q
2. P with R
3. Q with R
4. All comparisons isolate temperature.

Question 6

How many seconds shorter is the arrival time in Q than in P? Use the measurements.

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Question 7

Which result supports the claim that increasing sensor distance can increase the measured time at fixed temperature?

1. P takes longer than Q.
2. R takes longer than Q.
3. Q takes longer than R.
4. P and R have equal times.

Question 8

A student compares only P and R to estimate the effect of temperature. Explain why the comparison is insufficient.

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