Diffusion

Question 1

what is diffusion?

Answer 1

the spreading out of particles resulting in a net movement from an area of high concentration to an area of low concentration until an equilibrium is reached

Question 2

how does oxygen move in a cell?

Answer 2

•cells are surrounded by a high concentration of oxygen outside the cell as oxygen is transported in the blood stream from the lungs
•the oxygen molecules move into the cells through the cell membrane by diffusion from an area of high concentration to an area of low concentration

Question 3

how does carbon dioxide move out of a cell?

Answer 3

*oxygen used to generate energy in respiration produces a waste gas (carbon dioxide)
*this leaves a high concentration of carbon dioxide inside the cell which then moves to a lower concentration outside of the cell by diffusion

Question 4

what factors affect the rate of diffusion?

Answer 4

•surface area
•concentration gradient
•temperature

Question 5

how does temperature impact diffusion?

Answer 5

the higher the temperature the greater the rate of diffusion

Question 6

how does surface area impact diffusion?

Answer 6

the larger the surface area the greater the rate of diffusion

Question 7

how does the concentration gradient impact the rate of diffusion?

Answer 7

the higher the concentration gradient the greater the rate of diffusion

Question 8

where does diffusion take place?

Answer 8

solutions and gases because particles in these substances are free to move about randomly

Question 9

A student adds a drop of ink to a cup of glass water. What would the student observe about the movement of the ink?

Answer 9

The ink would diffuse through the water. This means the ink particles would move from an area of high concentration (where there is more ink)to an area of low concentration (the surrounding water)

Question 10

how does urea move out of cells?

Answer 10

• diffuses out of cells (from an area of higher concentration to a lower) into the blood plasma and is excreted by the kidney