Diffusion and Substance Movement

The video tutorial discusses a diffusion through a membrane lab conducted in class. Students are instructed to label diagrams with letters representing glucose, iodine, water, and starch to show their locations before and after the experiment. The video explains diffusion as the movement of substances from high to low concentration without energy use. It describes the setup of the experiment, where water, glucose, starch, and iodine are placed inside and outside a cell membrane. Observations include iodine moving into the bag, water moving into the bag, and glucose moving out.

What are the four substances you need to label on the diagrams in the diffusion lab?

• Glucose, iodine, salt, starch

• Glucose, salt, water, starch

• Salt, iodine, water, starch

• Glucose, iodine, water, starch

What is the main characteristic of diffusion in terms of energy usage?

• It requires energy

• It does not require energy

• It requires a catalyst

• It requires light

In diffusion, substances move from an area of ______ concentration to an area of ______ concentration.

• medium, high

• high, low

• low, high

• equal, equal

What was the initial concentration of glucose inside the cell at the start of the experiment?

• High

• None

• Low

• Equal to outside

Where was starch located at the beginning of the experiment?

• Outside the cell

• Not present

• Inside the cell

• Both inside and outside

What substance was labeled in orange during the experiment?

• Starch

• Water

• Iodine

• Glucose

After the experiment, which substance moved into the bag?

• Salt

• Glucose

• Iodine

• Starch

What happened to the water molecules during the experiment?

• They moved out of the bag

• They moved into the bag

• They evaporated

• They stayed the same

Which substance moved out of the bag after the experiment?

• Glucose

• Starch

• Water

• Iodine

What was observed about the iodine outside the beaker after the experiment?

• Iodine evaporated

• Some iodine remained outside

• No iodine was left outside

• All iodine moved into the bag