Science Fair Projects for 7th Grade

These science fair projects for 7th grade are perfect for allowing older kids to explore more advanced scientific concepts, like electrolysis and electroplating.

  • Visual aid of how to complete Copper Plated Coins

    Use some household materials to plate your coins with copper! You can also try copper plating designs onto your coins!In this project, you’re going to do two things: put copper into a solution, and make that copper come out of the solution and stick to another piece of metal (the quarter). That first process is called “electrolysis” and the second is called “electroplating.” So how do you do those things? Well, their scientific-sounding names give you a clue: with electricity!

    Electrolysis is a way to dissolve bits of metal into acidic liquids like vinegar. When you run electricity through vinegar, the vinegar helps to carry electricity from one side of the circuit to the other. Those bits of the vinegar react with the copper, making little bits of copper leave the positive side of the circuit and go into the liquid. You’ll see this happening when your solution turns blue.

    Electroplating is a way to put those little bits of copper onto something else. The bits of copper are ionic, which means they have an electrical charge, like a balloon that you rubbed on your hair. And just like a charged-up balloon, ions love to stick to things! By giving them another electrified metal, they rush out of the solution and onto the metal’s surface. You’ll see this when your quarter starts to change colors. With just a little electricity, you can use electrolysis and electroplating to plate a quarter with copper. Does that make it look like a penny to you?

  • Visual aid of how to complete Splitting Water
    Splitting Water

    (Ages 9-16)

    Did you know that water is actually a chemical? That’s why we call it H2O--water is made up of the chemical elements, hydrogen and oxygen! What would water look like if you could split water into its two parts? Try out this experiment to find out!

  • Visual aid of how to complete Paper Airplane Launcher

    Take your paper airplanes to new heights by making a motorized launcher for them.

  • Visual aid of how to complete Rubber Band Helicopter

    Learn about helicopters by making a rubber band powered flying toy!

  • Visual aid of how to complete Fizzy Candy Balloon

    Harness the power of fizzy candy and soda to inflate a balloon without blowing! This experiment can be repeated many times with different sodas to see how each reacts differently and which creates the biggest balloon.

Get inspired!