Chapter 8 Transport Through Membranes (Diffusion and Osmosis)

Question 1

What are the 2 types of Diffusion?

Answer 1

Simple & facilitated

Question 2

How do you measure diffusion?

Answer 2

It is the net, passive movement that results form the random, kinetic movement of individual molecules, from a region of high to low concentration.

Question 3

What is the concentration gradient?

Answer 3

The concentration gradient is when the is movement from a high concentration to low concentration based on the distance there is.

Question 4

What is the “resistance to flow” and the characteristics of it?

Answer 4

It is the complex interactions of physical and chemical properties, the molecular weight, and temperature.

Question 5

Describe the flow of physical and chemical properties:

Answer 5

It is when the properties go through a medium through which the substance is diffusing (density, viscosity, polarity of the medium).

Question 6

Describe what interaction the molecular weight has on flow:

Answer 6

It is when the diffusing substance is determined by Grahm’s law which the rate of diffusion is proportional to the M.W.

Question 7

Describe what the interaction temperature has on flow:

Answer 7

It increases thermal agitation of all molecules.

Question 8

What is facilitated diffusion?

Answer 8

Is when the membrane protein “facilitates” diffusion through the membrane by opening a “tunnel”

Question 9

What is osmosis?

Answer 9

is the diffusion of a solvent through a semipermeable membrane from high concentration to low concentration of water

Question 10

What are the parts of the solution?

Answer 10

A solute and solvent, a solute is the molecule that is being dissolved, the solvent is the substance that the solute is being dissolved in.

Question 11

What is a semipermeable membrane?

Answer 11

It is a membrane that is permeable to the solvent (mostly water) can pass through, the net permeable to the solute (solute cannot pass through)

Question 12

What are the 2 characteristic of a osmotic solute?

Answer 12

1. it is soluble in the solvent
2. It cannot pass through the semipermeable membrane

Question 13

What is a hypotonic osmotic system?

Answer 13

Solvent “water” flows into the cell,

Question 14

What is hypertonic osmotic system?

Answer 14

Water flows out of the cell

Question 15

What is a isotonic osmotic system?

Answer 15

no net movement of water in and out. “ middle of the two extremes” Animal cells like isotonic solutions.

Question 16

How is a plant cell in a osmotic system?

Answer 16

It has turgor pressure the cell is like a tire with air to keep the shape or a wilting plant