Q: Which formula is used to calculate the percent change in mass of potato cylinders after soaking in sucrose solutions?

$$\text{Percent Change} = \frac{\text{Final Mass} - \text{Initial Mass}}{\text{Initial Mass}} \times 100$$

Question 1

Which of the following best describes Brownian movement as observed in a carmine particle suspended in water under a microscope?

Accepted Answer

It moves randomly due to collisions with water molecules.

Question 2

Which equation correctly represents the relationship between the rate of diffusion ($$R) $$and temperature ($$T) $$for molecules in a solution?

Accepted Answer

$$R \propto T$$

Question 3

A dialysis bag containing 1 M sucrose solution is placed in distilled water. After one hour, what is the most likely observation?

Accepted Answer

The bag will gain mass as water enters by osmosis.

Question 4

Which of the following best explains why sand particles do not display diffusion throughout the water medium?

Accepted Answer

Sand particles are not dissolved and remain suspended.

Question 5

In the experiment with potato cylinders and sucrose solutions, what does the point where the percent change in mass is zero represent?

Accepted Answer

The concentration of sucrose where the solution is isotonic to the potato cells.

Question 6

Which of the following statements about osmosis is correct?

Accepted Answer

Osmosis is the movement of water molecules through a semipermeable membrane from low to high solute concentration.

Question 7

A plant cell is placed in a solution with lower osmotic potential than its cytoplasm. What will happen to the cell?

Accepted Answer

Water will enter the cell, causing it to become turgid.

Question 8

Which of the following best describes the difference between a solution and a colloid?

Accepted Answer

A colloid contains large molecules that remain suspended and scatter light, while a solution contains dissolved molecules that do not scatter light.

Question 9

If a cell is placed in a hypertonic solution, which of the following will occur?

Accepted Answer

Water will move out of the cell, causing it to shrink.

Question 10

Which formula is used to calculate the percent change in mass of potato cylinders after soaking in sucrose solutions?

Accepted Answer

$$	ext{Percent Change} = \frac{	ext{Final Mass} - 	ext{Initial Mass}}{	ext{Initial Mass}} 	imes 100$$

Question 11

During an osmosis experiment, a dialysis bag containing starch and iodine is placed in distilled water. After some time, the water outside the bag turns blue-black. What does this indicate?

Accepted Answer

Iodine diffused out of the bag and reacted with starch in the water.

Question 12

Which of the following is NOT a factor that affects the rate of diffusion?

Accepted Answer

Color of molecules

Question 13

In the U-tube osmosis experiment, what is the main force that opposes osmotic potential and eventually stops net water movement?

Accepted Answer

Hydrostatic pressure

Question 14

Which term describes the minimum pressure required to prevent osmosis across a semipermeable membrane?

Accepted Answer

Osmotic pressure

Question 15

A solution with a lower osmotic potential compared to another is described as:

Accepted Answer

Hypotonic

Question 16

Which of the following best explains why osmosis is a special case of diffusion?

Accepted Answer

Osmosis involves the movement of water molecules through a semipermeable membrane.

Question 17

In a dialysis experiment, which molecules are most likely to diffuse through the membrane?

Accepted Answer

Small ions and water molecules

Question 18

Which of the following scenarios would result in plasmolysis of a plant cell?

Accepted Answer

Placing the cell in a hypertonic sucrose solution

Question 19

Which of the following is the correct definition of turgor pressure?

Accepted Answer

The pressure of the cell contents against the cell wall due to water intake

Question 20

A student observes that a dialysis bag containing glucose solution gains mass after being placed in distilled water. Which process is responsible for this observation?

Accepted Answer

Osmosis of water into the bag

Diffusion, Osmosis Lab 7

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