Science Experiments

Archive for April, 2009

Question: Why will hot water cool down quicker when you have a large surface area?

I’ve been doing a science experiment using different sized beakers, and the biggest beaker with the hot water in cooled down the quickest because it had more surface area than the other beakers and I would like to know why?

Thanks x

Answer: large surface area means more exposure to colder air, therefore makes it cool faster.

Water Balloon in a Bottle – Cool Science Experiment

Question: Need fast help with a Volcano experiment ten points!?

Me and my friend have to do the volcano experiment for a science fair. We already tried lots of mixes but they wont explode over the top. All that happens is the bottle fizzes up. We need a mix that will explode without having to shake it or stir it. we already tried baking soda, vinegar, dish soap, warm water, and food colouring. Please help!

Answer: Baking soda, Vinegar etc are things of the past, though its safe. I am not sure if you can lay your hands on a chemical called Ammonium Dichromate, which when burnt produces a dazzling volcano. It has been used in classes as well for demonstration. Try this link…

http://www.practicalchemistry.org/experiments/ammonium-dichromate-volcano,56,EX.html

Fun Science Experiments : How to Blow Up a Balloon With Baking Soda & Vinegar

Innovation Survival: Innovation in Science