25 Fantastic 8th Grade Science Projects and Experiments

Did somebody say Rube Goldberg machine?

By 8th grade, kids are ready for more advanced experiments and activities, so inspire them with projects like extracting their own DNA or conducting fingerprint analysis. Below, our favorite 8th grade science projects and experiments.

(Always remember to use safety precautions and supervise kids around fires and chemicals, please.)

1. Create a rainbow of flames.

8th Grade Science Fire ThoughtCo

You can change the color of fire by adding chemicals found at your local grocery store—what a sight! This experiment is easy to set up, but of course requires safety precautions.

Learn more: ThoughtCo

2. Guide a growing plant through a maze.

8th Grade Science Plant Maze KiwiCo

Prove that plants really do seek out the light by setting up a maze, simple or complex. This is a simple 8th grade science project with really cool results.

Learn more: KiwiCo

3. Teach a computer to play tic-tac-toe.

8th Grade Science TicTacToe Pixabay

This intermediate Javascript coding project requires some very basic background programming knowledge. It’s perfect for kids with an interest in all things computers.

Learn more: Science Buddies

4. Construct a Rube Goldberg machine.

8th Grade Science Rube YouTube

Create a machine to complete a simple task in the most complicated fashion! This is a neat 8th grade science project, because it allows you to use a variety of physics concepts in a fun way. See an example in this YouTube Video, and learn more about Rube Goldberg machines here.

5. Block the sun’s UV rays.

8th Grade Science UV Steve Spangler

Use color-changing UV beads (readily available online) to test the protective power of medicine bottles, hats, clothing, and more. This is an 8th grade science experiment with nearly endless possibilities.

Learn more: Steve Spangler Science

6. Concoct and test your own shampoo.

8th Grade Science Shampoo Science Buddies

Ever wonder what makes shampoo effective? In this experiment, you’ll cook up your own recipes and try them out to see which ingredients work best.

Learn more: Science Buddies

7. Separate water into hydrogen and oxygen.

8th Grade Science Electrolysis Navigating by Joy

Use electrolysis to prove that water really is made up of hydrogen and oxygen. It’s a simple concept, but one that never fails to amaze.

Learn more: Navigating by Joy

8. Get your laundry really clean.

8th Grade Science Cleaning Steve Spangler

Find out if all those laundry detergent commercials are really telling the truth with this 8th grade science experiment. Test their cleaning power on a variety of stains and fabrics, and analyze your results.

Learn more: Steve Spangler Science

9. Build an infinity mirror.

8th Grade Science Infinity Mirror Science Buddies

Experiment with optical illusions by creating a tunnel of lights that seems to stretch away into infinity. Learn about engineering and the physics of optics along the way.

Learn more: Science Buddies

10. Grow a carbon sugar snake.

8th Grade Science Carbon Snake KiwiCo

Remember those little black pellets that fire up into long snakes from Fourth of July? This is the same concept, but much bigger! The simple chemical reaction of sugar and baking soda makes it happen. (As always, ensure kids are supervised around fire.)

Learn more: KiwiCo

11. Generate a Lichtenberg figure.

8th Grade Science Lichtenberg

Lichtenberg figures capture the branching path of electricity as it travels through an object. You can make your own in a variety of ways, including burning it into wood or acrylic.

Learn more: Science Notes

12. Assemble a spring scale.

8th Grade Science Spring Scale Science Buddies

Apply Hooke’s Law to find out if the stretching of a spring can be used to accurately measure the weight of objects. The materials are simple, but you’ll need patience and physics to calibrate a spring and use it to test weights.

Learn more: Science Buddies

13. Brew up some root beer.

8th Grade Science Rootbeer Steve Spangler

Who says science can’t be delicious? Plus, any experiment where you get to use dry ice is always fun (take proper safety precautions, please). This yummy project teaches chemical reactions and of course requires a taste test.

Learn more: Steve Spangler Science

14. Test water quality.

8th Grade Science Water Testing Homeschool Scientist

A student water testing kit opens up limitless options for 8th grade science experiments. Test the water quality of local streams, swimming pools, or even your own tap.

Learn more: The Homeschool Scientist

15. Conduct fingerprint analysis.

8th Grade Science Fingerprints Pixabay Image

Budding forensic scientists will love this idea. Learn to dust for prints and even try a technique called “fuming” for tricker surfaces. See if you can compare prints and make accurate matches.

Learn more: Home Science Tools

16. Extract bismuth from Pepto-Bismol.

8th Grade Science Pepto Popular Science

This is the kind of project that really makes you feel like a scientist. Grinding tablets with a mortar and pestle, filtering in beakers, heating over a bunsen burner… kids will need supervision and some special materials, but their inner chemist will love it all.

Learn more: Popular Science

17. Make a solar desalinator.

8th Grade Science Desalination Science Buddies

Clean freshwater is a valuable commodity. Construct solar-powered desalination devices with readily available materials, and find the most effective desalination methods.

Learn more: Science Buddies

18. Keep your hands warm.

8th Grade Science Handwarmer Steve Spangler

If you live in a chilly part of the world, chances are you’ve seen chemical hand-warmers for sale. In this 8th grade science experiment, you’ll make your own hand-warmer by harnessing the power of oxidation.

Learn more: Steve Spangler Science

19. Explore symbiosis with nitrogen-fixing bacteria.

8th Grade Science Symbiosis

Many plants depend on nitrogen for growth, but how important is it? This science project compares the growth of pea plants with and without nitrogen-fixing bacteria.

Learn more: Education.com

20. Crash cars for science.

8th Grade Science Crash The Ardent Teacher

This is a great class project for teachers, but it’s also excellent for an 8th grade science fair experiment. Build cars and crash-test them to learn the best methods of keeping passengers safe.

Learn more: The Ardent Teacher

21. Power up homemade batteries.

8th Grade Science Battery 124 Homeschool 4 Me

Building batteries is a classic science experiment for any age. Make it into a project by trying different variables and exploring just how much power you can produce.

Learn more: 123 Homeschool 4 Me

22. Examine the connection between personality and memory.

8th Grade Science Memory Educationcom

Do introverts have better memories than extroverts? This science project aims to find out. Round up some willing volunteers and administer the Meyers-Briggs personality test, then challenge your subjects with a memory test and compare the results.

Learn more: Education.com

23. Extract your own DNA.

8th Grade Science DNA Home Science Tools

DNA is the blueprint of life, and you’ll be surprised at how easy it is to extract your own with a few simple supplies. Preserve it in alcohol in the freezer when you’re done.

Learn more: Home Science Tools

24. Fuel a film canister rocket.

8th Grade Science Alka Seltzer Steve Spangler

Fire a film canister into the air using the chemical reactions of Alka-Seltzer. Once you’ve mastered the basic process, experiment with different strengths of solutions and sizes of container to see how high you can go.

Learn more: Steve Spangler Science

25. Discover the strength of interleaved paper.

8th Grade Science Phone Books Science Buddies

Paper seems smooth and slides apart easily, right? This experiment challenges that notion by interleaving multiple pieces of paper and testing their strength. This is an easy project with fascinating results.

Learn more: Science Buddies

What are your favorite 8th grade science projects? Come and share in our WeAreTeachers HELPLINE group on Facebook. 

Plus, our favorite 6th grade and 7th grade science projects.

25 Fantastic 8th Grade Science Projects and Experiments

Posted by Jill Staake

Jill Staake is a writer living in Tampa, Florida. She's spent most of her life teaching in traditional classrooms and beyond, from 8th grade English to butterfly encounters, and believes learning is a life-long process.

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