Question: Why is diffusion faster in liquid than semisolid?
Answer Choices:
A. Molecules are more tightly packed in liquids.
B. Molecules are more spaced in semisolids.
C. Liquids are less dense.
Answer: C
Question: Which of the following statements are true about the diffusion of iodine and starch?
Answer Choices:
A. If iodine and starch both cross the tubing, color change in both.
B. If only iodine crosses, only tubing darkens.
C. Starch diffuses but iodine doesn’t.
Answer: A and B
Question: If the white cloud formed closer to the HCl cotton ball, what does it mean?
Answer Choices:
A. NH₃ diffused faster.
B. HCl diffused faster.
C. Both diffused equally.
Answer: A
Question: What happens to Elodea in a hypertonic solution?
Answer Choices:
A. Cell shrinks due to water loss.
B. Cell expands.
C. No change.
Answer: A
Question: What conclusion can be drawn if diffusion was faster with higher concentration?
Answer Choices:
A. A greater concentration gradient increases rate of diffusion.
B. Diffusion depends on solute size.
C. Temperature is the main factor.
Answer: A
Question: Which gas will diffuse slower based on molecular weight?
Answer Choices:
A. NH₃
B. HCl
C. Both equal
Answer: A
Question: Which experiment tests gas diffusion rate based on molecular weight?
Answer Choices:
A. Place both gases in a jar and see which evaporates first.
B. Use cotton balls soaked in HCl and NH₃ and see where cloud forms.
C. Use balloon inflation test.
Answer: B
Question: How would you test if diffusion rate depends on concentration gradient?
Answer Choices:
A. Vary temperature.
B. Use same concentration in multiple gels.
C. Vary solute concentrations on a semisolid matrix.
Answer: A
Question: How does diffusion rate compare in liquid vs semisolid?
Answer Choices:
A. Faster in semisolid.
B. Faster in liquid.
C. Equal rate.
Answer: A
Question: What does it mean if potassium permanganate diffuses faster with higher concentration?
Answer Choices:
A. The higher the concentration, the slower the rate of diffusion.
B. Rate of diffusion doesn’t depend on concentration.
C. A greater concentration gradient will cause a faster rate of diffusion.
Answer: C
Question: Why do Elodea cells shrink in a hypertonic solution?
Answer Choices:
A. Cell absorbs more water.
B. Water leaves the cell.
C. Water enters until it bursts.
Answer: A
Question: What does it mean if more water moves into the thistle tube with higher corn syrup concentration?
Answer Choices:
A. Osmosis moves water into region of lower solute concentration.
B. Higher corn syrup pulls in more water.
C. Corn syrup itself diffuses across membrane.
Answer: D (your selected answer): More water is drawn up into the thistle tube with higher concentrations of corn syrup.
Question: What makes a membrane selectively permeable?
Answer Choices:
A. It lets everything pass.
B. It blocks small molecules.
C. It lets small molecules (like water) pass, blocks large ones (like corn syrup).
Answer: C