Factors Affecting Diffusion

How does distance affect diffusion?

• Shorter the distance the faster the rate
• The bigger the distance the faster the rate
• It doesn't matter - molecules will always diffuse at the same rate

How does the concentration gradient affect diffusion?

• The greater the concentration difference the faster the rate
• The smaller the concentration difference the faster the rate
• The greater the concentration the slower the rate

Why is having a control in experiments important?

• It makes sure the independent variable is the reason for the results
• To know what you originally started off with
• To add another group of results making sure there's more data

Which of these molecules is not likely to enter a cell by diffusion?

• A protein
• Oxygen
• Glucose
• Water

What is diffusion?

• Actively moving molecules from a low to high concentration
• Actively moving water from a low to high concentration
• Moving molecules along a concentration gradient until they are evenly spread

Why does diffusion not need energy?

• It occurs too fast for energy to be generated
• Molecules move spontaneously from low to high concentrations
• Molecules move spontaneously from high to low concentrations
• Molecules move slowly so there is no need for energy

How does surface area affect the rate of diffusion?

• Greater the surface area the slower the rate 
• Greater the surface area the faster the rate
• Smaller the surface area the faster the rate
• Surface area does not affect diffusion

How does increasing temperature affect the rate of diffusion?

• Increases enzyme activity increasing the rate
• Gives molecules more energy increasing the rate
• Takes energy away from molecules slowing down the rate
• Decreases enzyme activity and decreases the rate

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How does the cell membrane control which molecules can enter and leave the cell?

• Only allows big molecules through
• Only allows small molecules through
• Only allows molecules with Carbon through
• Only allows water through

Tags

NGSS.MS-LS1-2

Why is diffusion important?

• Molecules need to be moved out of cells
• Cells need a constant supply of some molecules whilst getting rid of others
• There is no other way of transporting things in or out of a cell
• It requires energy which is always being produced and needs to be used up

Tags

NGSS.MS-LS2-3