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3rd Grade Science Activities : Page 3

Set your young chemist up for an afternoon of science-fueled magic with a deceptively simple activity starring baking soda and vinegar!

Vinegar and Baking Soda Balloon

These science fair experiments demonstrate the chemistry of rust and the oxidation process.

Bust That Rust!

This project demonstrates the correspondence between the volume of water displaced by a submerged object and the volume of the object displacing it.

Eureka! Volume and the Displacement of Water

Build a 3d animal cell model with this cool science fair project, which helps kids visualize and understand the function of a cell's parts and organelles.

3D Animal Cell Model

Find out whether a longer airplane will fly farther or a wider paper airplane.

Does A Longer Paper Airplane Fly Farther than a Wide One?

Learners hypothesize about and experiment with soil erosion in this hands-on activity.

Explore Soil Erosion

This science fair project idea determines what household items are good conductors of electricity.

Conductor or Insulator?

The goal of this evaporation experiment is to learn about how different external conditions affect drying time.

Rate of Evaporation

Science fair project examining barometric pressure, and how it can be used to predict the weather. How does atmospheric pressures relate to weather conditions?

Barometric Pressure

In this science project, learn about water transport in plants and make a beautiful dyed floral arrangement with cohesion, adhesion, and xylem tubes!

Water Transport in Plants

This science fair project investigates whether tapping the top or the side of the can will stop a vigorously-shaken can of soda from exploding.

How to Stop Soda From Exploding

In this outdoor science activity you'll find tips on how to create a nature journal by choosing a native plant or animal and tracking that species.

Everyday Darwin: Create a Nature Journal

How does a flashlight work? Kids will make a complete circuit and explore how voltage contributes to brightness with this science fair project idea.

Complete Circuit: How Does a Flashlight Work?

Science fair project that examines condensation and the conditions needed in order for dew to form.

Dew Point, Humidity and Weather

In this hands-on design challenge your child will make their very own Rube Goldberg Machine.

Design Challenge: Make a Rube Goldberg Machine

This science fair project teaches students about wilting and browning of salad greens.

Why Do Greens Turn Brown?

The possibilities are endless with this fun Halloween-themed STEM activity! With simple supplies, your child will experiment, adapt, and use their creativity while they build structures using different specifications.

Halloween STEM Building Challenge

This fun experiment provides a concrete and visually striking illustration of photosynthesis.

Demonstrating Photosynthesis: Writing in Grass

Science fair project that examines what causes thunder and why a thunderclap sounds so loud. How is lightening related to the creation of sound waves?

A Thunderous Sound

The goal of this golf science fair science fair project is to determine whether the temperature of a golf ball affects its elasticity and its rebound.

Golf Science Fair Project: Temperature and Rebound

This science fair project idea investigates how color affects temperature.

Color And Temperature

In this science fair project, students learn how pressure can make the minerals in a rock line up in the same direction and form bands and foliation.

How Does Pressure Change Minerals?

Make your own helicopter using a paper clip and a sheet of paper. Hold the spinner up in the air, let it go, and watch it spin gracefully to the ground.

Make a Paper Helicopter

While your cells are much too small to see without a microscope, you can create the look of a cell in your very own home with just an egg and vinegar!

Naked Egg

How does rust form? Kids will learn about the roles oxygen, water, and electrons play in rust chemistry in this cool science fair project idea.

Rust Chemistry: How Does Rust Form?

Help your fifth grader execute this experiment involving a lit candle (submerged in water!) to show him the wonders of heat energy transference.

Keep a Candle Burning Underwater!

This science fair project teaches students the differences between fruits and vegetables.

Is it a Fruit or a Veggie?

How does a kazoo, the strings of a guitar, or the speaker of a radio make sound? The purpose of this science fair project is to show how vibration makes sound.

How A Kazoo Makes Sounds

The pinwheel is a simple toy that has been around for years and uses the wonders of the wind to spin it and delight kids of all ages!

DIY Pinwheels

Want to make Halloween truly eerie? Science to the rescue! These ghouly hands come alive with a little help from simple chemistry.

Halloween Decorations: Make Ghouly Hands!

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