Diffusion Pg.17 Flashcards
Diffusion is the ___________ ______ of _________ from an area of _______ _______ to an area of ________ _______.
Spreading out.
Particles.
Higher concentration.
Lower concentration.
Diffusion happened in ________ and ______.
Solutions and gases.
The difference in concentration is called the concentration ___________.
The _________ the difference in concentration, the faster the diffusion rate.
Gradient.
Bigger.
A _________ temperature will also give a faster diffusion rate. This is because the _______ have more ________ so they move around faster.
Higher.
Particles.
Energy.
Cell membranes let stuff _______ in and out of the cell.
Diffuse.
Only very ______ molecules can fit through cell membranes e.g. oxygen, glucose, amino acids and water.
Small.
Big _______ like starch and proteins can’t fit through the _________.
Molecules.
Membrane.
Molecules flow through the membrane from where there’s a __________ concentration to where there’s a ________ concentration.
Higher.
Lower.
They actually move ______ ways - but if there are a lot more particles on one side of the membrane, there’s a net (overall) movement from that side.
Both.
The ______ the surface area of the _________, the faster the diffusion _____.
This is because more particles can pass through at the same time.
Larger.
Membrane.
A student adds a drop of ink to a glass of cold water.
a) what will the student observe to happen to the drop of ink?
b) how might the observation differ if the ink was added to a glass of warm water?
a) the ink will diffuse in the water because the ink particles will move from an area where there is a higher concentration of ink to an area where there is a lower concentration of ink.
b) the ink particles will diffuse faster.
Explain how the surface area of a membrane effects the rate of diffusion.
The larger the surface area of the membrane, the faster the diffusion rate. This is because more particles can pass through at the same time.
