Engage every student with these 7th grade science fair projects, whether they’re interested in biology, chemistry, physics, environmental science, or any other discipline. Plus, find interesting classroom demos, experiments, and hands-on activities to spice up your lesson plans!
To make it easier to find classroom activities or science fair ideas for 7th grade, we’ve rated all the projects by difficulty and the materials needed:
Want to learn more about animals or human behavior, the environment around you, or other life science topics? Try these 7th grade science fair projects.
Difficulty: Easy / Materials: Medium
Can certain colors improve your memory? This experiment explores that idea using different text, background colors, and blue light settings on devices.
Learn more: Colors and Memory at Education.com
Difficulty: Easy / Materials: Medium
ADVERTISEMENTThe 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: Eggshell Experiment at Feels Like Home
Difficulty: Medium / Materials: Basic
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: Flexibility Experiment at We Have Kids
Difficulty: Medium / Materials: Medium
Design a grow box using a cardboard box, foil, and a plug-in light socket. Then, use it for all kinds of plant-based science fair ideas for 7th grade students.
Learn more: DIY Grow Box at Uplifting Mayhem
Difficulty: Medium / Materials: Medium
Bacteria that accumulate on objects in the water form a substance called biofilm. In this 7th grade science fair project, students build an apparatus to collect biofilm and then experiment with ways to reduce the amount of biofilm that accumulates over time.
Learn more: Biofilm Experiment at The Homeschool Scientist
Difficulty: Medium / Materials: Medium
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: Water Filtration at The Homeschool Scientist
Difficulty: Medium / Materials: Basic
Kids are fluent in text-speak, but does it really count as a whole new language? In this 7th grade science fair project, students research language and the history of texting, then compile a texting glossary and consider texting’s practical applications.
Learn more: Text Language at Education.com
If you’re fascinated by test tubes, beakers, and Bunsen burners, check out these interesting 7th grade science fair projects and ideas.
Difficulty: Easy / Materials: Medium
Students need just a few simple supplies to perform electroplating, but the results are always impressive. (Get copper strips and 9V battery snap connectors with alligator clips on Amazon.) Turn this into a 7th grade science fair project by changing up the variables (does temperature matter?) or items being electroplated.
Learn more: Electroplating at KiwiCo
Difficulty: Medium / Materials: Medium
Germ experiments are one of the most popular science fair ideas for 7th grade students. Swab household items, school supplies, and more to discover what’s living on the items around you.
Learn more: Germ Experiment at Angelic Scalliwags
Difficulty: Easy / Materials: Medium
Can you find a way to slow or prevent oxidation (rusting)? This is one of those 7th grade science fair ideas that’s simple in concept but has lots of practical applications.
Learn more: Oxidation Experiment at Teach Beside Me
Difficulty: Easy / Materials: Medium
Blowing bubbles may sound like too much fun for a science project, but when conditions like temperature are altered, the experimental part kicks in. What conditions do you need to blow a bubble that freezes?
Difficulty: Medium / Materials: Medium
Use the calcium in eggshells to make your own sidewalk chalk. Then, tinker with the recipe to see if you can make the chalk last longer, resist water, or other variables.
Learn more: DIY Chalk at Kidspot
Difficulty: Easy / Materials: Basic
This simple project tests whether acid rain has any effect on plant life, using vinegar in place of fossil fuels. Experiment with different acid concentrations and pH levels for a more advanced version.
Learn more: Acid Rain Experiment at STEAM Powered Family
Explore the laws of motion, the science of energy, or STEM challenge engineering ideas through 7th grade science fair projects like these.
Difficulty: Medium / Materials: Medium
Engineer a balloon-powered car using basic materials from around the house (even the wheels are bottle caps!). Experiment to see how far or fast you can make the car go.
Learn more: Balloon Car at Prolab
Difficulty: Medium / Materials: Medium
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: Solar Oven at Children’s Science Center
Difficulty: Easy / Materials: Medium
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: Water Clock at STEAM Powered Family
Difficulty: Medium / Materials: Medium
A 7th grade science activity that doubles as a sweet treat? Your students are going to love this activity using Oreo cookies and colorful sprinkles to make cellular mitosis models.
Learn more: Oreo Mitosis at Ballin With Balling
Difficulty: Medium / Materials: Medium
Meiosis is similar to mitosis, but it’s specific to the production of gametes. These hands-on models use basic materials like pipe cleaners and beads to make the process easier to visualize.
Learn more: Meiosis Models at Science Prof Online
Difficulty: Medium / Materials: Advanced
This is such a fun way to teach kids about the concept of homeostasis! Get all the instructions you need at the link.
Learn more: Homer-o-stasis at The Trendy Science Teacher
Difficulty: Easy / Materials: Medium
If you’re learning about how genetic traits are passed along from parent to child, try this jelly-bean demo. When you’re finished, you can enjoy a sweet treat!
Learn more: Jelly Bean Genetics at The Owl Teacher
Difficulty: Medium / Materials: Medium
Give your class basic supplies like rubber bands, plastic cups, and cardboard boxes. Then challenge them to create their very own pinball machines!
Learn more: Pinball STEM Challenge at Student Savvy
Difficulty: Medium / Materials: Advanced
If you’ve got access to some basic chemicals, conduct this lab that helps students see the carbon cycle in action using their own breath.
Difficulty: Easy / Materials: Medium
This easy experiment is a cool way to show kids how heat affects air molecules, making hot air rise. They’ll need some supervision with the fire, so try this out on the playground for extra safety.
Learn more: Floating Tea Bags at Coffee Cups and Crayons
Difficulty: Easy / Materials: Medium
Explore the salinity of various bodies of water, then re-create their waters to see if you can make an egg float or sink. Experiment with other objects too.
Learn more: Saltwater Density at Uplifting Mayhem
Difficulty: Easy / Materials: Medium
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: Greenhouse Effect at Teaching Science With Lynda
Difficulty: Medium / Materials: Medium
Kids are never too old to enjoy bubbles, so use them to learn more about cell membranes in this fun 7th grade science activity.
Learn more: Cell Membrane Bubbles at The Trendy Science Teacher
Difficulty: Medium / Materials: Medium
Learning about wave action? Build this surprisingly easy wave machine for hands-on exploration.
Learn more: Wave Machine at Engaging Science Labs
Difficulty: Medium / Materials: Medium
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: Taxonomy Project at Our Journey Westward
Difficulty: Medium / Materials: Medium
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: Edible Cell Model at Weird Unsocialized Homeschooling
Difficulty: Medium / Materials: Medium
Travel to the Galápagos Islands and follow in Darwin’s footsteps as students explore finch beak adaptations in this clever natural selection lab.
Learn more: Natural Selection Lab at Teach To Serve
Difficulty: Medium / Materials: Medium
Citizen science projects bring science to life for kids! One of our favorites is Project FeederWatch, where kids put out bird feeders and then count and report on their visitors. This is a great way to build a love of birding for life.
Learn more: Classroom Resources at Project FeederWatch
Difficulty: Medium / Materials: Medium
If you’re introducing lab work and chemistry basics to 7th graders, this easy lab is a great way to do it. They’ll learn safety procedures and get to feel like “real” scientists as they pour, mix, swirl, and more.
Learn more: Chemical Change Lab at Super Sass and Science Class
Difficulty: Medium / Materials: Medium
DNA models are always more fun when you can snack on them afterwards. Want to make this a healthier activity? Use fruits and veggies to make models instead.
Learn more: Edible DNA Model at Hess UnAcademy
Difficulty: Medium / Materials: Medium
Combine a STEM challenge with learning about food webs in this clever project. Kids will love the hands-on aspect, and it will really help the learning stick.
Learn more: Food Web Marble Maze at Teach Savvy
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