i need a one day 8th grade controlled experiment fast?
- 1 decade agoFavorite Answer
These science fair sites might help:
- kymyst007Lv 51 decade ago
for biology: demonstrate osmosis
take 2 cups: fill one with very salty water and one with DI water.
cut three even slices from a potato.
soak one slice in the salt water, one in the DI water, and leave one on the counter. wait about 45 min at least. the salt water will be rubbery, the DI water one will be very firm, and the one left on the counter will be somewhere in between, Explain this by osmosis and water moving in o rout of the potato cells