Chemistry science projects are all about the study of substances and their transformation; seeing out what happens when they are combined together and how they react to one another. Chemical reactions can make tantalizing projects; just think of the first-rate working volcano project. The first-rate working volcano has been done many, many times, but that's because it is a lot of fun to watch, but if you want to score points for originality you should pick a separate project.
One fun (and delicious) chemistry science fair scheme is to make your own sugar crystals. Also known as rock candy, you have likely seen these in gift shops at pretty much any major attractions; science exhibits, the zoo and so on. They are pretty to look at and tasty to eat. In increasing they are also very easy to make. All you need is sugar and water, plus a glass jar to grow them in and some string for them to grow up. It only takes a day before they begin to grow.
Another fun chemistry scheme might be to see if colored candles burn faster or slower than white candles. All you need for this scheme is a white candle, a few separate colored candles, a lighter and adult supervision. Light each candle at the same time and observe the rate they burn at. Be sure to narrative your results.
One other scheme you could try is a scheme to see which type of tape sticks best to separate types of surfaces. You can experiment and see which brands work better on which surfaces.
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