Question

How can you compare the rate of diffusion in the two glasses? What is the reason for this difference?

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

Diffusion is the gradual spread of particles from high-concentration locations to low-concentration areas until they are evenly distributed throughout an area. Brownian motion, the seemingly random movement of particles within a liquid or gas, causes diffusion, which we name passive since it requires no energy input.

Explanation:

Materials

Food colouring (red & blue)

2 clear glass cups of the exact same size and shape

2 differently shaped clear containers (narrow and wide), preferably about the same size

Procedure: Temperature Difference

Fill one glass cup with hot water. Fill the second glass cup with cold water.

Drop 1-2 drops of red food colouring in the hot cup and 1-2 drops of blue food colouring in the cold one.

Watch and wait for the colour to disperse entirely.

Observations & Results

You should have noticed that the red food colouring in the hot water dispersed much more quickly than the blue food colouring in the cold water did. This is because particles vibrate faster and harder when they’re warmer—the hot water molecules struck the food colouring molecules harder and more frequently, scattering them until the cup ended up containing a homogeneous solution.

Procedure: Differently Shaped Containers

Fill both containers with the same temperature of the water.

Drop one drop of food colouring in each container and compare their rate of diffusion.

Observations & Results

The narrowest container will likely have demonstrated a slower rate of diffusion because fewer molecules are in contact with each other, meaning fewer collisions of the solvent with the solute.

Conclusions

Temperature and the shape of the containers affected the rate of diffusion in both experiments. Particles move faster in warmer water, so the red colouring spread more quickly through the cup. The narrow shape of the containers used in the second experiment slowed down diffusion because of the container’s effect on Brownian motion. (The reason behind this difference is diffusion).