Do you have a junior scientist at home or in the classroom? Kids are naturally curious. They ask questions, make observations, and love figuring out how things work. That’s exactly what science is all about!
These easy science experiments and challenges help children explore chemistry, physics, life science, and engineering concepts through hands-on play. Most use simple supplies you probably already have on hand, making them perfect for home, school, science clubs, and STEM centers.
Whether you’re introducing science to preschoolers or looking for engaging investigations for elementary students, these activities encourage kids to think like scientists while having fun.
What Does a Junior Scientist Do?
Scientists don’t just wear lab coats and work in laboratories. They ask questions, make predictions, test ideas, and learn from their results.
Kids can do the same thing!
As they complete science activities, encourage them to:
- Observe carefully
- Ask questions
- Make predictions
- Test ideas
- Record results
- Share discoveries
These simple habits build critical thinking and problem-solving skills that extend far beyond science.
Top Science Experiments for Kids
Science is best learned through hands-on exploration. If you’re looking for a place to start, these favorite science experiments are easy to set up, use simple supplies, and introduce important science concepts through play.
Walking Water Experiment – Learn about capillary action as colored water appears to “walk” between cups.
Lemon Volcano – Explore a bubbling chemical reaction using lemons and baking soda.
Pepper and Soap Experiment – Investigate surface tension with this simple kitchen science activity.
Homemade Lava Lamp – Discover density and chemical reactions in a colorful homemade lava lamp.
Inflating Balloon Experiment – Use baking soda and vinegar to inflate a balloon without blowing into it.
Rubber Egg Experiment – Transform an ordinary egg into a bouncy egg while learning about chemical reactions.
Color Changing Flowers – Observe how water travels through plant stems with this classic life science activity.
Sink or Float Investigation – Predict, test, and observe which objects sink and which float.
Grab Your Free Junior Scientist Printable
Help kids record observations, draw results, and think like real scientists with our free Junior Scientist printable pack.
Science Challenges for Junior Scientists
Think like a scientist! Scientists learn by asking questions and testing ideas. These simple challenges encourage kids to think critically, make predictions, and compare results.
Penny Drop Challenge – How many drops of water fit on a penny before it spills over?
Sink or Float Challenge – Test household objects and look for patterns in what sinks and what floats.
Chromatography Experiment – Separate the colors hidden inside black markers.
Catapult Challenge – Investigate how different designs affect launch distance.
Paper Airplane Challenge – Compare airplane designs to see which flies the farthest.
Chemistry Experiments for Kids
Chemistry helps us understand how substances interact and change.
These simple chemistry experiments are always a hit with kids:
- Magic Milk Experiment
- Dancing Raisins
- Oil and Water Experiment
- Fireworks in a Jar
- Density Tower
- Cabbage pH
👉 Looking for more? Explore our complete collection of Kitchen Chemistry Experiments for Kids.
Physics Experiments for Kids
Physics is all around us. It helps explain motion, forces, energy, gravity, and more.
Explore physics through these hands-on activities:
- Marble Momentum Investigation (coming soon)
- Paper Helicopter
- Balloon Rocket
- Balloon Car
- Wind Powered Car
- Domino Chain Reaction
- Popsicle Stick Chain Reaction
- Parachute Challenge
👉For even more ideas, visit our Force and Motion Activities and Potential and Kinetic Energy Activities pages.
Life Science Activities for Kids
Life science helps children learn about plants, animals, habitats, and living things.
Try these favorite life science investigations:
- Color Changing Flowers
- Seed Germination Experiment
- Apple Browning Experiment
- Leaf Chromatography
- Animal Habitats
- Plant Growth Observations
- Nature Scavenger Hunts
👉 You can also explore our Animal Activities, Plant Activities, and Life Science Projects for Kids.
Turn an Experiment Into a Science Fair Project
Many of these activities can easily become science fair projects.
Instead of simply completing the experiment, encourage kids to test a variable and collect data.
For example:
- Does water temperature affect Walking Water?
- Which paper airplane flies the farthest?
- How does ramp height affect marble speed?
- Which objects float best?
- Which catapult design launches the farthest?
Helpful resources:
Frequently Asked Questions
What is a junior scientist? A junior scientist is a child who explores the world through observation, experimentation, and discovery. Junior scientists ask questions, test ideas, and learn through hands-on activities.
What are the best science experiments for kids? Walking Water, Lemon Volcano, Pepper and Soap, Homemade Lava Lamps, and Rubber Eggs are some of the most popular beginner-friendly science experiments for children.
What science experiments can kids do at home? Many science activities use common household supplies. Popular options include sink or float investigations, chromatography, baking soda reactions, density experiments, and capillary action activities.
How do you teach the scientific method to kids? Start by encouraging children to ask questions, make predictions, test ideas, and discuss results. Simple experiments provide natural opportunities to practice scientific thinking.
What science topics can kids learn through experiments? Hands-on science activities can introduce chemistry, physics, biology, earth science, engineering, and scientific inquiry skills.
More Science Resources
Keep exploring with these popular science resources:
- Science Vocabulary Words
- Science Tools for Kids
- Famous Scientists for Kids
- Engineering Activities for Kids
Continue Exploring Science
Want printable science investigations, reusable recording pages, STEM challenges, and organized hands-on activities all in one place?
Explore the Classic Science Activities Pack for ready-to-use science and STEM learning at home or in the classroom.
