Lab 4
Simple diffusion is the random movement of molecules across a
semipermeable membrane. Energy is not required for this process
High- to low concentration
Particles moving
Your cell is a semipermeable membrane
Osmosis
Usually water molecules
Water moving
Low solute concentration- higher solute concentration
The water will follow the higher concentration
With the membrane, the water can pass, but the sugar molecules are too
big
Tonicity
Is determined by solute concentration and membrane permeability,
influenced of the solute concentration in the surrounding environment to
cause a cell to lose or gain water
, The movement base on outside
Can effect diffusion and osmosis
Extraccelluar environment the fluid
Hypotonic-less concentration
Under
Water is gonna follow so it will move into the potato
Causing to swell
Isotonic- the same
Solutes of solution(environment) are equal to the potatoes solute
Nothing happens
Hypertonic – more concentrate higher
Higher in environment than potatoes
Cell would shrink
The water will leave potatoe
Lab simulation
Corn starch dissolved In 200 ml of water also iodine to show diffusion
Iodine detects starches in samples
Colormetric indicator for starches
The reaction is it forms a black color to almost purple
The bag of iodine is the semipermeable membrane so we will see if the
iodine is small enough to pass into the solution
Check in on the bag at 10,20,30 minutes
Simple diffusion is the random movement of molecules across a
semipermeable membrane. Energy is not required for this process
High- to low concentration
Particles moving
Your cell is a semipermeable membrane
Osmosis
Usually water molecules
Water moving
Low solute concentration- higher solute concentration
The water will follow the higher concentration
With the membrane, the water can pass, but the sugar molecules are too
big
Tonicity
Is determined by solute concentration and membrane permeability,
influenced of the solute concentration in the surrounding environment to
cause a cell to lose or gain water
, The movement base on outside
Can effect diffusion and osmosis
Extraccelluar environment the fluid
Hypotonic-less concentration
Under
Water is gonna follow so it will move into the potato
Causing to swell
Isotonic- the same
Solutes of solution(environment) are equal to the potatoes solute
Nothing happens
Hypertonic – more concentrate higher
Higher in environment than potatoes
Cell would shrink
The water will leave potatoe
Lab simulation
Corn starch dissolved In 200 ml of water also iodine to show diffusion
Iodine detects starches in samples
Colormetric indicator for starches
The reaction is it forms a black color to almost purple
The bag of iodine is the semipermeable membrane so we will see if the
iodine is small enough to pass into the solution
Check in on the bag at 10,20,30 minutes
