2nd - 4th Grade Science Activities

Explore scientific concepts with this experiment that introduces kids to the scientific method!

In this science fair project, kids start a chemical reaction that will make a balloon inflate itself!

In this activity, children will let their imagination run wild as they design and build a new planet in the solar system.

In this activity, your child will be asked to create a boat that can successfully float while holding 25 pennies.

Use pepper and soap to discover some fun facts about the properties of water.

Kids will conduct a cool limewater carbon dioxide test that can be performed with common household materials to learn about the chemistry of this common gas.

Check out this fun science fair project to make a vinegar and baking soda balloon and demonstrate how gas is created as a result of the chemical reaction.

4th graders construct an ocean food web to learn about consumers and trophic levels, food webs, and food chains in this cool ecology science fair project.

For this science fair project, kids will learn how to make a lemon battery. They can conduct this classic experiment using readily available materials.

This science fair project idea experiments with spinning color wheels and optical illusions.

This science fair project idea explores the different properties & interactions of sugar molecules.

Kids explore how a single movable pulley can confer a mechanical advantage over a fixed pulley in this cool engineering science fair project for 2nd grade.

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

What is elasticity? Students will investigate how this concept applies to bouncing ball physics by testing the bounces of balls made out of different materials.

This science fair project teaches about mold. Students will test different foods to see which grow mold the fastest.

In this fun science fair project, make two different scale models of our solar system using Astronomical Units and planets' relative size!

Kids build a desert food chain, desert food web, and desert food pyramid in this cool science fair project to learn about trophic levels and consumers.

In this exciting and empowering challenge, your child will construct a bridge using marshmallows and toothpicks!

Did you know your body is full of simple machines? This project looks at one of the third-class levers in the human body: your arm!

In this fun science fair project idea, kids will experiment with various methods in order to discover the fastest way to cool a soda.

Does the temperature of a magnet affect its strength? Learn about the relationship between magnets and temperature with this cool physics science fair project.

In this Halloween-themed activity, young learners will find out what happens when they mix two household items together to create a surprising chemical reaction.

Tired of gum with flavor that lasts for just a couple of minute? Put gum to the test with this chewy science experiment!

Discover how and which salt melts ice the quickest.

Learn how to make an anemometer with step-by-step instructions in this cool science fair project idea for 4th grade.

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

In this activity, your child will be challenged to use simple materials to create a catapult for a small, lightweight toy.

Start your toy engines -- this is going to be a fast and friction-filled race!

In this air pressure science experiment with a balloon and a jar, children will use heat to create a partial vacuum and suck a balloon into a jar.

In this activity, your child will be challenged to make a tower using paper cups.