Exploring Diffusion and Osmosis Through the Iodine Starch Experiment

What materials are needed for the iodine in plastic bag diffusion experiment?

• Starch solution, iodine, dropper, zipper plastic bag

• Water, salt, dropper, plastic bottle

• Vinegar, baking soda, spoon, plastic bag

• Sugar solution, iodine, dropper, plastic cup

What is the first step in the procedure of the experiment?

• Turn the bag upside down

• Mix starch solution in water in a beaker

• Put iodine solution in the zipper bag

• Zip up the plastic bag

How do you check if the plastic bag has a leak?

• By shaking the bag

• By squeezing the bag

• By submerging the bag in water

• By turning the bag upside down

What color change indicates the presence of starch in the experiment?

• Blue

• Green

• Red

• Deep purple black

Why does the iodine pass through the plastic bag membrane?

• Because water molecules are larger than iodine molecules

• Because iodine molecules are smaller than starch molecules

• Because iodine molecules are larger than starch molecules

• Because starch molecules are smaller than iodine molecules

What is the main function of the plastic bag in this experiment?

• To mix the solutions

• To act as a semipermeable membrane

• To hold the starch solution

• To change the color of iodine

What is osmosis?

• Movement of molecules with energy input

• Movement of solvent molecules through a semipermeable membrane

• Movement of solute molecules through a membrane

• Movement of molecules without a membrane

What does a semipermeable membrane allow?

• Neither solute nor solvent molecules to pass through

• Both solute and solvent molecules to pass through

• Only solvent molecules to pass through

• Only solute molecules to pass through

What is diffusion?

• Movement of molecules without energy input across a semipermeable membrane

• Movement of molecules without a membrane

• Movement of molecules with energy input

• Movement of molecules from lower to higher concentration

What happens to the solute concentrations on both sides of the membrane during osmosis?

• They increase on one side

• They decrease on one side

• They remain the same

• They become equal