B1.6 - Diffusion

Question 1

Diffusion

Answer 1

• physical process involving the movement of substances
• spreading out of particles of a gas/any substance in a solution
• particles move from a high concentration to a low concentration
• resulting in the net movement of particles
• is a result of the random movement of particles in any direction

Question 2

Molecules

Answer 2

• groups of atoms

Question 3

Ions

Answer 3

Positively charged or negatively charged atoms

-eg na+

Question 4

Net movement formula

Answer 4

Particles moving in - particles moving out

Question 5

Concentration gradient

Answer 5

The difference between two areas of concentration

-diffusion occurs down a concentration gradient

Question 6

The steeper the concentration gradient…

Answer 6

The faster the rate of diffusion

Question 7

Temperature in diffusion

Answer 7

• increase in temp causes the particles to heat up and become energised to move quicker
• increasing rate of diffusion

Question 8

Ways of increasing diffusion

Answer 8

• increasing concentration
• increasing temperature
• increasing surface area

Question 9

Increasing surface area example

Answer 9

• no nucleus

- folds in the membrane called villi

Question 10

Process of diffusion involving glucose, small intestine, bloodstream

Answer 10

• small intestine is lined with villi increasing surface area
• high concentration of glucose causes diffusion to occur down a concentration gradient
• rich blood supply maintains concentration gradient as the blood quickly carries it away

Question 11

Process of diffusion within your blood and lungs

Answer 11

• high concentration of co2 in the blood
• low concentration of co2 in your lungs
• diffusion takes place down a concentration gradient
• large surface area of alveoli increases diffusion
• rich blood supply maintains concentration gradient