Diffusion and Osmosis

Diffusion and Osmosis

One of the principles of the kinetic theory of matter is that all molecules of matter are in constant motion.

This will help us to understand diffusion and osmosis.

How does diffusion occurs

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Diffusion

• It is defined as the process of mixing molecules of one substance with another substance by random molecular motion.

• Diffusion always occurs from higher concentration to lower concentration.

We can easily see the process of diffusion in gases, in here, the molecules of smoke drift from the train into the air.

Diffusion always occurs from higher concentration to lower concentration.

For this reason, the cologne vapors spread out to fill the room, but the reverse would not happen.

Diffusion happens also in liquids and there are even examples in solids.

Fill in the Blank

________ is the process of mixing molecules of one substance with another substance by random molecular motion

Multiple Choice

Diffusion always occurs from:

• higher to lower concentration

• lower to higher concentration

How does osmosis occurs?

Osmosis

• Substances diffusing through semipermeable membranes.

• Examples of semipermeable membranes are your skin, thin solids like a ballon and the membrane of living cells

Multiple Choice

What type of molecular movement consists of one-way diffusion accross a semipermeable membrane?

• Diffusion

• Brownian motion

• Osmosis

• Cohesion

Multiple Choice

The student sitting next to you just came from gym class and forgot to shower and you can tell. The previous statement is an example of

• Diffusion

• Osmosis

Multiple Choice

After sitting in the bathtub for hours, your fingers start to look like prunes. The previous statement is an example of:

• Diffusion

• Osmosis

Multiple Choice

The girl sitting two rows ahead of you put on too much perfume this morning. The previous statement is an example of:

• Diffusion

• Osmosis

Multiple Choice

Oxygen molecules move from the air sacs in the lungs across the cell membranes into the blood. The previous statement is an example of:

• Diffusion

• Osmosis