Copy of Copy of Virtual Lab - Diffusion and Osmosis (9/27/2023) (5/28/2026)

Last updated about 2 hours ago

24 questions

Overview of the Virtual Lab

Diffusion Simulation

Diffusion Lab Demonstration

Osmosis Simulation

Osmosis Lab Demonstration

Required

Copy of Copy of Virtual Lab - Diffusion and Osmosis (9/27/2023) (5/28/2026)

Last updated about 2 hours ago

24 questions

Overview of the Virtual Lab

This virtual lab has four sections:
Sections 1 and 2 discuss the principles of diffusion. First, you will be using a simulation that discusses some principles of diffusion. Next, you will watch a demonstration of a diffusion lab using starch and iodine that tests these principles.
Sections 3 and 4 discuss the principles of osmosis. Like the first two sections, you will first use a simulation that discusses osmosis followed by a demonstration of an osmosis lab that tests these principles. 
During each simulation, you will have to read very short pieces of text as well as observe short simulations in order to answer sets of questions.

For the lab demonstrations, all questions are answered from the observations and data of each demonstration, based on what you should learn about the principles of diffusion and osmosis. 

Diffusion Simulation

While completing the above activity over diffusion, complete questions 1-6.

Net diffusion (diffusion) is the movement of particles _______ the concentration gradient from areas of high to low concentration.

At the very beginning of the simulation, which side had the greatest concentration of blue particles? _______ 

The type of energy that diffusion uses to move particles is _______. 

Diffusion moves particles from areas of _______ concentration to areas of _______ concentration. 

Eventually side A and side B will come to equilibrium, which is when the concentration is _______ on both sides of the membrane.

When the temperature is higher, the movement of the molecules is _______, when the temperature is lower, the movement of the molecules is _______. 

Diffusion Lab Demonstration

When this lab is set-up: 
where is the concentration of iodine the highest? _______ 
where is the concentration of starch the highest? _______ 

What color indicates when starch interacts with iodine? _______ 

Text

00:01

Text

00:50

At the conclusion of the diffusion lab (in the video, above):
Was the color of the fluid in the beaker changed: _______ 
Was the color of the fluid in the dialysis tube changed: _______ 
Where did you see evidence that starch and iodine interacted (in the dialysis tube or in the beaker): _______ 
Which chemical (starch or iodine) was able to cross through the plastic of the dialysis tube? _______ 
Why did this chemical cross through the plastic bag? _______ 
Which chemical was not able to cross through the plastic of the dialysis tube? _______ 

Osmosis Simulation

While completing the above activity over diffusion, complete questions 10-15.

Osmosis is the movement of _______ through a _______ membrane.

What is the solvent? _______ 

Does osmosis apply in a situation in which there are no particles dissolved in water? _______ 

In the simulation, to which side did the water move to? _______ 
Why is this so? _______ 

It is best for living cells to be in what type of solution? _______ 
Consider why this may be so - this type of solution helps the cell to maintain their _______ .

Living cells that are placed in hypertonic solutions will lose _______ and, as a result, it will _______.
This is because water will always osmose toward the _______  

If a cell is placed in a hypotonic solution, it will _______ water, because, in this scenario, the hypertonic solution is _______. 

If this continues to happen, the cell will eventually _______ .

Consider that the concentration of salt in normal blood cells is 0.9%. If you were sick and in the hospital, especially with something like the flu, you might become dehydrated and would need to receive an IV of saline solution to return your body's fluid levels to homeostasis. What is the concentration of the IV saline (salt) solution given to you by the hospital? _______ 

Imagine someone who has become ship-wrecked on an island in the middle of the Pacific Ocean without immediate access to freshwater. The island is surrounded by water that has a salt concentration of approximately 3.5%. If the typical concentration of salt in human cells is approximately 0.9%, explain, from the concept of osmosis, why drinking seawater is a bad idea.

Osmosis Lab Demonstration

Required

During the set-up of the lab:
What was the initial mass of the 3 deco cubes that were placed in the DI (distilled) water? _______ g
What was the initial mass of the 3 deco cubes that were placed in the sucrose solution? _______ g

After 20 minutes of "soak time" in each solution:
What was the mass of the 3 deco cubes that were placed in the DI (distilled) water? _______g
What was the mass of the 3 deco cubes that were placed in the sucrose solution? _______ g

After 40 minutes of "soak time" in each solution:
What was the mass of the 3 deco cubes that were placed in the DI (distilled) water? _______g
What was the mass of the 3 deco cubes that were placed in the sucrose solution? _______g

After 120 minutes of "soak time" in each solution:
What was the mass of the 3 deco cubes that were placed in the DI (distilled) water? _______ g
What was the mass of the 3 deco cubes that were placed in the sucrose solution? _______ g

Copy of Copy of Virtual Lab - Diffusion and Osmosis (9/27/2023) (5/28/2026)

Copy of Copy of Virtual Lab - Diffusion and Osmosis (9/27/2023) (5/28/2026)

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