35 of the Best 7th Grade Science Projects and Experiments

Ever mummified a hot dog?

7th Grade Science

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It’s no secret that 7th grade science students love hands-on activities. The chance to explore concepts up close, making discoveries (and a few messes!) along the way, really helps to drive learning home. This round-up includes 7th grade science experiments from a variety of STEM fields: biology, earth science, physics, engineering, and much more. They’re all meaningful and fun ways to learn, whether in the classroom or as science fair projects. Pick a few to try with your middle schoolers soon!

1. Watch the greenhouse effect in action.

Climate change can be a contentious topic, so start by teaching kids about the greenhouse effect, which is easy to see and understand. Then, urge them to explore data collected by other scientists so they can learn to make informed decisions about topics like global warming.

Learn more: Teaching Science With Lynda

2. Design a helping hand.

7th Grade Science Hand Science Buddies

This is a great individual or group 7th grade science project, as it encourages students to use and hone their design and engineering skills to make a working model of a hand.

Learn more: Science Buddies

3. Purify water with charcoal.

7th Grade Science

Plenty of homes use water filtration systems these days, but how do they really work? This chemistry experiment explores how charcoal filters impurities from drinking water.

Learn more: The Homeschool Scientist

4. Construct a water clock.

You’ll blow your 7th grade science students’ minds when you tell them they’re going to build a clock using engineering that’s been around for thousands of years. The supplies are simple, but the results are pretty neat! 

Learn more: STEAM Powered Family

5. Test PH using cabbage.

7th Grade Science PH Education Possible

Teach kids about acids and bases without needing PH test strips! Simply boil some red cabbage and have students use the resulting water to test various substances—acids turn red, and bases turn green.

Learn more: Education Possible

6. Explore how sugary drinks affect teeth.

7th Grade Science Sugar Eggs Feels Like Home

The calcium content of eggshells makes them a great stand-in for teeth. In this experiment, students use eggs to determine how soda and juice stain the teeth and wear down the enamel. (Bonus: Have students try different toothpaste and toothbrush combinations to see how effective they are.)

Learn more: Feels Like Home

7. Put together a DIY barometer.

This simple but effective DIY science project teaches kids about air pressure and meteorology. They’ll have fun tracking and predicting the weather with their very own barometer. 

Learn more: Edventures With Kids

8. Design a solar oven.

Students experiment with the best way to build a solar oven, exploring thermal energy, reflection, convection, and other physics concepts. They can serve up their experiment results along with their final reports!

Learn more: Children’s Science Center

9. Marvel at a density rainbow.

We learn early on that oil floats on water, but where do other liquids fit in? Students find out when they conduct this colorful density experiment that has them layer different substances, making a rainbow.

Learn more: ThoughtCo

10. Copper-plate some coins.

7th Grade Science Copper Coins Kiwico

Students need just a few simple supplies to perform this classic 7th grade science project involving electrolysis and electroplating, but the results are always impressive.

Learn more: Kiwi Co

11. Tinker around with hydraulic power.

Give kids a thorough understanding of hydraulics with this ready-to-use unit, which culminates in designing your own hydraulic invention!

Learn more: Teacher Geek

12. Collect and control biofilm.

7th Grade Science Biofilm Home School Scientist

Bacteria that accumulates on objects in the water forms a substance called biofilm. In this ecology project, students build an apparatus to collect biofilm, then experiment with ways to reduce the amount of biofilm that accumulates over time. 

Learn more: The Homeschool Scientist

13. Construct a geodesic dome.

7th Grade Science Geodesic Dome Science Buddies

Budding engineers will love designing, building, and testing the strength of the fascinating geodesic dome. This experiment requires nothing more than newspaper and masking tape!

Learn more: Science Buddies

14. Discover computer coding with LEGO bricks.

Chances are good at least some of the kids in your class will go on to work with computer code someday. Introduce the concept now with LEGO bricks!

Learn more: Little Bins for Little Hands

15. Learn whether color affects memory.

7th Grade Science Memory

Can certain colors improve your memory? This experiment explores that idea, using only colored and black markers and a set of willing participants.

Learn more: Education.com

16. Ride the wave (machine).

Learning about wave action? Build this surprisingly easy wave machine for hands-on exploration.

Learn more: Engaging Science Labs

17. Grow and experiment with crystals.

7th Grade Science Crystals ThoughtCo

There are so many ways to experiment with crystals, teaching kids about supersaturated solutions. Check out the link below for great ideas, like making an edible crystal flower.

Learn more: ThoughtCo

18. Extract DNA from an onion.

7th Grade Science Onion DNA Science Buddies

This experiment takes a bit of time and requires a few special supplies, but kids will truly feel like scientists when they extract onion DNA via a test tube.

Learn more: Science Buddies

19. Use a fidget spinner to explore the laws of motion.

Fidget spinners are a great way to keep some kids focused, but did you ever consider using them for a science experiment? This one explores Newton’s First Law of Motion, aka The Law of Inertia. Fun and educational!

Learn more: From Engineer to Stay At Home Mom

20. Mummify a hotdog.

7th Grade Science Mummification Science Buddies

Are your students fascinated by the ancient Egyptians? Then we’ve got the perfect 7th grade science project for your class! No need for canopic jars; just grab some baking soda and get started.

Learn more: Science Buddies

21. See if caffeine helps you type faster.

7th Grade Science Caffeine Pixabay

People seek out a jolt of caffeine when they’re feeling sluggish, but does it really help them perform better? This science experiment tasks students with answering that question using the scientific method.

Learn more: ThoughtCo

22. Stretch your mind with a flexibility experiment.

7th Grade Science Flexibility We Have Kids

Find out how important stretching really is by comparing the flexibility of willing test subjects before and after stretch exercises. This is a great experiment for fitness fans.

Learn more: We Have Kids

23. Find out if mint is really cooling.

Minty candies make the mouth feel cooler, but does the temperature in the mouth actually drop? This cool 7th grade project about the merits of the scientific method will help students find the answer.

Learn more: Super Sass & Science Class

24. Build a da Vinci bridge.

There are plenty of bridge-building experiments out there, but this one is unique. It’s inspired by Leonardo da Vinci’s 500 year-old self-supporting wooden bridge. History + science for the win!

Learn more: iGame Mom

25. Create a taxonomy system.

7th Grade Science Taxonomy Our Journey Westward

Students can step into Linnaeus’ shoes by creating their own system of taxonomy, using a handful of different dried beans. This is a fun 7th grade science project to do in groups, so students can see the differences between each group’s system.

Learn more: Our Journey Westward

26. Generate electricity.

7th Grade Science Generator

In this 7th grade science fair project, kids build a generator from scratch. The supplies are readily available online, and there are plenty of experiments students can perform once it’s built.

Learn more: Free Science Fair Projects

27. Play around with oxidation.

7th Grade Science Oxidation Teach Beside Me

Oxidation experiments can be as simple as dropping objects into water to see if they rust or made more complex by altering the conditions to see if rusting can be delayed or prevented.

Learn more: Teach Beside Me

28. Spin Beyblades to explore angular momentum.

There’s nothing kids love more than getting to play with their toys during school hours. Use their favorite battling tops to explore the relationship of weight to angular momentum.

Learn more: From Engineer to Stay at Home Mom

29. Blow hot or cold bubbles.

7th Grade Science Bubbles

Blowing bubbles may sound like too much fun for a science project, but when conditions like temperature are altered, the experimental part kicks in. If it’s cold enough, students can even blow frozen bubbles!

Learn more: ThoughtCo

30. Test out DIY lip balm recipes.

7th Grade Science Lip Balm Science Buddies

Try this experiment for the 7th grade science fair: Cook up batches of lip balms using different recipes and then test them to see which is the most effective.

Learn more: Science Buddies

31. Whip up some eggshell chalk.

7th Grade Science Chalk Kidspot

Remember that calcium in eggshells we mentioned earlier? This science project has students use that calcium to make their own sidewalk chalk. Kids will love grinding the eggshells into powder then decorating the sidewalk with their results!

Learn more: Kidspot

32. Dive into an exploration of swim bladders.

If you’re learning about fish anatomy, or just exploring buoyancy, this simple experiment is a fun way to dive into the concepts. (Find more balloon science here.)

Learn more: Science Buddies

33. Bake an edible cell model.

7th Grade Science Cell Model Weird Unsocialized Homeschoolers

Sure, students could build a cell model out of clay, but cake and candy are so much more delicious! Check out the link below to see how one teacher does it.

Learn more: Weird Unsocialized Homeschoolers

34. Determine whether texting is a new language.

7th Grade Science Education.com

Kids are fluent in text-speak, but does it really count as a whole new language? In this project, students research language and the history of texting then compile a texting glossary and consider texting’s practical applications.

Learn more: Education.com

35. Swing a glass of water.

This classic science experiment teaches kids about centripetal force. Be forewarned: this has the possibility of making a bit of a mess, so consider taking this one outside.

Learn more: Steve Spangler Science

Looking for more? Check out these lists of science projects for grades K-8.

Take it outside with 25 Wet and Wild Outdoor Science Projects and Activities.

35 of the Best 7th 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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