NYS Diffusion Lab

Movement Through a Membrane

The Benedict’s Test

• http://youtu.be/QU0VBcHnQOk

Benedict’s solution is BLUE and will turn YELLOW, ORANGE, GREEN, OR RED IN THE PRESENCE OF A SIMPLE SUGAR (MONOSACCHARIDE)

OSMOSIS

OSMOSIS is the diffusion of water

Adding SALT water will make a cell SHRINK

Adding DISTILLED WATER will cause a cell to SWELL back up

Osmosis Videos

http://youtu.be/GOxouJUtEhE

http://www.kscience.co.uk/animations/turgor.htm

Diffusion

Diffusion is the movement of molecules from high to low concentration.

Iodine, Glucose, Starch

ResultsStarch + Lugol’s Iodine = PURPLE/ BLUE BLACK

GLUCOSE + Glucose Test Strip = Turns GREEN

STARCH DID NOT DIFFUSE BECAUSE IT WAS TOO BIG!