Diffusion and Agarose Experiments

The video tutorial demonstrates a diffusion experiment using phenolphthalein and ammonia in an Erlenmeyer flask. The instructor explains how to create model cells using agarose, which is dissolved and mixed with phenolphthalein. The agarose is then cut into cubes to simulate cells of different sizes. These cubes are placed in ammonia to observe the diffusion of color, illustrating the impact of surface area to volume ratios on diffusion rates. The experiment's results are analyzed to understand how cell size affects material movement.

What is the role of phenolphthalein in the experiment?

• It is used to dissolve agarose.

• It changes color when reacting with a base.

• It neutralizes ammonia.

• It acts as a base.

What is agarose made from?

• Sugar

• Salt

• Seaweed

• Sand

Why is it important to ensure the agarose does not boil over?

• To keep the temperature constant

• To prevent loss of material

• To maintain the color

• To avoid a chemical reaction

What is the purpose of cutting the agarose into cubes?

• To make it easier to dissolve

• To increase the reaction speed

• To enhance the color change

• To simulate different cell sizes

How many drops of ammonia are added to each beaker?

• 20

• 25

• 15

• 10

What is being measured in the diffusion experiment?

• The temperature change

• The amount of ammonia used

• The distance the pink color diffuses

• The time taken for color change

What was the diffusion distance for the 3 cm cubed cell?

• 4 mm

• 5 mm

• 3 mm

• 2 mm

What was the diffusion distance for the 1 cm cubed cell?

• 2 mm

• 3 mm

• 5 mm

• 4 mm

How does the surface area to volume ratio affect diffusion?

• Larger ratios slow down diffusion

• Smaller ratios speed up diffusion

• Larger ratios enhance diffusion

• Ratios have no effect on diffusion

What is the maximum diffusion distance for the 1 cm cubed cell?

• 2.5 mm

• 5 mm

• 1 mm

• 10 mm