1) In experiment 1, which dye diffused more quickly? red blue both diffused at t

Question

1)

In experiment 1, which dye diffused more quickly?

red

blue

both diffused at the same rate

neither dye diffused through the solution

2)

In experiment 3, which bag should have the highest final volume?

3% sucrose, green

3% sucrose, blue

15% sucrose, red

30% sucrose, yellow

3)

In experiment 4, why was the final water displacement higher than the initial, regardless of the type of potato?

Water flowed out of the potatoes due to osmosis

Water flowed into the potatoes due to osmosis

The tonicity of the potatoes' cells limited water movement

The cells of the potatoes' lysed and collapsed, taking up less space

red

blue

both diffused at the same rate

neither dye diffused through the solution

Explanation / Answer

1. Diffusion is inversely proportional to molecular weight. The lesser is the molecular weight, the faster the molecules diffuse. The Red dye diffuses faster since it has a lower molecular weight.

2. 30% sucrose. Since the concentration of 30% sucrose is higher than the other ones, more water moves into the tubing to equilibrate the concentration.

3. Water flowed into the potatoes due to osmosis. Since the potatoes are kept in water (or distilled water), which has low water potential/high water concentration, water moves across the cell membranes into the cells. The cells become turgid and displace more water when kept in water again.

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