What are some good 7th grade science fair projects?

I did a dissolving drugs lab, I got a blue medal and an A+. Basically you get different forms of the same brand (EX: Soft gel, Tablet, Capsule) and put them all in a glass of water and see how long they take to dissolve and write down all the results, I used a graph. It isn't a common science fair project so it's perfect. If you still don't get what I mean, get some Advil in soft gel form, capsule form, and tablet form and then put them in a glass and time the dissolving. These are just the basics, if you would like you can add other variables or swap the thing around. For example instead of doing which type of pill dissolves the fastest you could instead change the liquid and keep the same pill. Here are some ideas to try, Water, Vinegar (Acidic), Bleach (Basic) along with a certain type of pill. Water temp, hot, cold, room temp. The list goes on, just make sure you don't have more than one variable otherwise the whole thing would be irrelevant. Good luck!

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Go to sciencebuddies.com thats where i got my expeiriment. Same grade. it helped me. I did HYDROPONICS- the planting of plants in water

You could do something on light waves, and use various colored light bulbs to demonstrate certain concepts such as energy or interference. You could make a simple pendulum (you'll need some twine or strong string as well as a mass that can be tied to the twine or string tightly). Then, measure how long it takes the mass to swing back and forth once. Make the length of the arm smaller, and notice how the time changes. You could grow mold in a variety of different environments based on temperature, light, and sugar supply, and see what combination of variables leads to fastest growing and slowest growing mold. You could shoot a ball and measure how far it goes with different initial velocities, angles of inclination, and sizes of the ball. Find a relationship and see if it's true! You could figure out how to perform electrolysis on your own. You could do a series of "how does it really work" things on random common day things that we take for granted. A car engine, a light bulb, a fan, a water fountain, even a remote control for a television set. You could try making some bridges out of only toothpicks and glue (it would take a long time...), and then design some tests to measure their strength. What patterns of toothpicks lead to the strongest design? What patterns are weak, and why? Here's a good one. Compress a Slinky toy as far as possible. Then, holding it vertically, drop it. What happens to the slinky as it falls? Can you figure out why? This one's related to the above one in a subtle way. Turn on a smooth and gentle faucet (no bubbles and relatively slow water flow). If you don't have access to a slow enough faucet, you can make one by getting a Styrofoam cup and poking a clean circular hole in the bottom (but then your time will be limited!). Now, study the shape of the stream of water. Where is it thickest and where is it thinnest? Why is this happening? If you're interested in this, look up flux. That's the key.