Science Experiments

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Cornflour slime. Easy science in 30 seconds

Question: jello and pineapple experiment?

im doing the famous experiment about enzymes using jello and pineapple in my science class. we put fresh pineapple in one bowl of jello and we put heated pineapple in the other bowl of jello. i know what is supposed to happen but how can i make it work for my class easier. my teacher said last year (its a weekly class) the kids got it in one week but the year before it took the kids 4 weeks to get the eperiment to work. it didn’t work for my class last week and i really don’t want to do this experiment over and over. so what are some tips so that i can make sure it will work this week?

Answer: There are many variations on the classic pineapple-jello lab demonstration, so I cannot comment specifically on the procedure you are using, but I can give you a few pointers:
(1) The main enzyme being used from the pineapple is papain. Papain, unlike most enzymes, works best at rather amazingly high temperatures, so performing your experiment inside a refrigerator is not a good idea.
(2) Papain works best in a slightly acidic medium. Adding a bit of white vinegar might help.
(3) Papain is inhibited by heavy metals, so I would advise carrying out all steps using glass containers only. Also, the use of tap water is not advisable, and neither is distilled water (distilled water often contains metal ions if the distillation apparatus has a metal boiler or cooling tube). Purified drinking water that has been ozonated and passed through ion exchange resins would be preferable. If you can’t get that, you can put the water through a brita filter twice before using it.

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Question: Newton’s Second Law of Motion Experiment?

Im in science/technolgy ay my school, so we have the same teacher every year, and every year he assigns this. We have to explain the three laws of motion and we have to come up with an experiment of some sort showing that the law is true. Every year, i get the first and the third right, but i always seem to mess up the second law. NO ONE ever gets the second law right..got any ideas for an experiment proving Newton’s 2nd law of motion? presentations are Friday and im all nervous

Answer: Here are some web sites with experiments to demonstarte the second law:

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