Science fair can be the highlight of your child’s 5th grade school year. We have rounded up 31 great fifth grade science fair ideas to get you started! With one previous science fair behind his or her belt, your 5th grader is now ready for a little more challenge.

5 easy science fair projects to finish in 24 hours

In this post, we’ve assembled 31 science fair project ideas for 5th grade. We link each project description to its original source, where you can get more information and step-by-step instructions.


Tornado in a Bottle

In this fascinating experiment, water will create a channel as it is emptied from a bottle. A device connecting the two bottles allows the water to empty into a second bottle.

Recommended for Grade 5.

Source: www.scinado.com


Effects of Temperature on the Sublimation of Dry Ice & How Soap Reacts in the Microwave

Two projects in one! Testing how temperature affects two different solids: dry ice and soap.

Recommended for Grade 5.

Source: GlobalPost.com


Do People Have a Dominant Side of Their Brain?

These experiments will help the scientist to determine if people have a dominant hand, foot, eye or ear. A great behavioral discovery project.

Recommended for Grades 5-6.

Source: www.faculty.washington.edu


When life gives you lemons, make a battery!

Lemon Power is a fascinating experiment that you can attempt to duplicate with other fruit. Which fruit makes the best battery? Experiment and find out!

Recommended for Grades 4-5.

Source: www.kidsactivitiesblog.com


A Science Fair Project on Tooth Decay by Jennifer Elrod

Doing an experiment on tooth decay is both beneficial and interesting. It only requires a few inexpensive materials and a week’s worth of observation and record keeping. The experiment requires no work after the initial setup.

Recommended for Grades 4-5.

Source: www.ehow.com


Homemade Lava Lamp by Alexa Bach McElrone

This project takes about 2 hours to complete the experiment and the write-up. Kids will get to explore the relationship between oil and water in terms of density as well as hydrophilic/hydrophobic compounds.

Recommended for Grades 4-5.

Source: http://www.education.com


How the Amount of Light Affects Germination and Growth.

The goal of the project is to find out how different lighting conditions affect seeds germination and growth. This article will give you the step by step procedure for this project.

Recommended for Grades 4-5.

Source: www.scienceprojectlab.com


Growing Bacteria in Petri Dishes by Steve Spangler

A Petri dish prepared with nutrient agar (a seaweed derivative with beef nutrients) is an ideal food source for the bacteria you’ll be growing. Collect samples from around the house or classroom and record the results for the one with the most bacteria.

Recommended for Grades 4-5.

Source: www.stevespanglerscience.com


Bridge Project by Sarah Benton

This project explores the basic physics of bridges. The goal is that the student will develop an understanding through experimentation of which shapes are the most structurally strong, and that many factors are taken into account in engineering and building.

Recommended for Grades 4-5.

Source: www.education.com


Paper Airplane Science Fair Project

Create your own hypothesis about paper airplanes, then start your experiment. This article gives you all of the information you need.

Recommended for Grades 4-5.

Source: www.easy-science-fair-projects.net


Barometer Science Project

Make your own barometer and then use it to test weather conditions on a dry day, a rainy day, a cloudy day, etc.

Recommended for Grades 4-5.

Source: www.hubpages.com


How Do Antacids Work?

In this activity, learners explore the chemical reaction between water and effervescent antacid tablets. This hands-on activity models how a material can act differently when it’s nanometer-sized. Learners compare the reaction rate of an effervescent antacid tablet that is broken in half with one that is broken into many pieces.

Recommended for Grades 4-5.

Source: www.howtosmile.org


Gummy Bear Osmosis

Do Gummy Bears dissolve in water? In vinegar? In liquid soap? Test your hypothesis on a variety of liquids and find out.

Recommended for Grades 4-5.

Source: www.homeschool.com


Is Your Dog’s Mouth Cleaner than Your Mouth?

Is it a myth or fact that a dog’s mouth has less germs that a human’s mouth? Follow these simply instructions and test for yourself.

Recommended for Grades 4-5.

Source: www.ehow.com


Does Mint Actually Cool Things Down? By Jennifer Penn-Chiu

Mint-flavored gum, breath fresheners, and hard candies often advertise that mint has a cooling effect, and use images of frost and ice to demonstrate this sensation. But is this sensation a result of the mint actually lowering temperatures?

Recommended for Grades 4-5.

Source: www.education.com


Which Food Will Rot First?

This example tests the rotting of 4 different foods, but your scientist can test as many different types of food as they can imagine.

Recommended for Grades 4-5.

Source: www.notimeforflashcards.com


Helmet Crash Test by Steve Spangler

Not only will your little scientist gain a better appreciation for using a helmet, she can also learn more about the science behind it. Try testing different size melons and different height drops.

Recommended for Grades 4-5.

Source: www.parenting.com


Can Magnets Affect the Growth Process of Radish?

In this experiment, your scientist will determine whether magnets make radish plants grow faster or slower.

Recommended for Grades 4-5.

Source: www.buzzle.com


Playground Teeter-Totter

The goal of this project is to create a compound machine using pulleys and levers that would be able to lift a Barbie doll up and down by pulling a string by the player. A common problem on the playground is that you sometimes can’t find another person to go on the teeter totter with you.

Recommended for Grades 4-6.

Source: www.projects.juliantrubin.com


Growing a “Mold Garden”

The goal of this project is to grow different mold species on different kind of substrates to find out if the same bread mold species will grow on all of them. Do all mold species have the same taste and preferences?!

Recommended for Grades 4-5.

Source: www.scienceprojectlab.com


Making a Simple Sundial and Testing Its Accuracy

Learn how to make a sundial and then test its accuracy with a series of experiments.

Recommended for Grades 4-6

Source: www.explorable.com


A Pint Pot Planet

This experiment will demonstrate the water cycle and test different hypotheses on rainfall and the water cycle.

Recommended for Grades 4-5

Source: www.raisingsparks.com


Build and Test a Paper Bridge

This project helps you discover how to create a strong bridge using just paper. Instructions also offer some additional parameters to add into the experiment.

Recommended for grades 4-5

Source: www.teacherstryscience.org


Paper Airplane Experiment

Experiment to find the best design for a paper airplane

Recommended for Grades 4-5

Source: ScienceFairMath


Use the Energy in a Peanut to Heat Water

Just about everything has potential energy stored in it. The problem is releasing that energy to be able to do some work.

A tiny peanut contains stored chemical energy. When we eat them, the stored energy is converted by our bodies so we can do work. We can also use the energy in a peanut to heat a container of water.

Recommended for grades 4-6

Source: www.energyquest.ca.gov


Oil Spill Experiment

This experiment will demonstrate the detrimental effects of oil spills to marine life

Recommended for grades 4-6

Source: www.explorable.com


Make Your Own Microscope with Water

Make a simple microscope using water and take a closer look at the world around you.

The lens you create with water works like a microscope or magnifying glass, allowing you to see objects in much greater detail than if you were just looking with the naked eye.

Recommended for grades 4-6

Source: www.sciencekids.co.nz


How Does the pH of the Soil Affect the Type of Plants?

Plants’ survival can be based on the pH of the soil. This experiment lets you test soil pH based on the type of plants that live there.

Recommended for Grades 5-6.

Source: www.livescience.com


Surface Tension Experiment

Surface tension is one of water’s most important properties. It is the reason that water collects in drops, but it is also why water can travel up a plant stem, or get to your cells through the smallest blood vessels. You can experiment with surface tension using just a few household items.

Recommended for Grades 5-6.

Source: www.hometrainingtools.com

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