120+ Exciting 5th Grade Science Project Ideas With Hypothesis In 2023

5th Grade Science Project Ideas With Hypothesis

Are you ready to embark on an exciting journey into the world of 5th-grade science projects with hypotheses? Science projects are not just about fun experiments; they also involve forming hypotheses to make educated guesses about outcomes. But what makes a good hypothesis for a science project? In this blog, we’ll explore the key components of a successful hypothesis.

Selecting the right 5th-grade science project can be a challenge, and we’ll share some valuable tips to help you choose the perfect one. We’ll dive into the importance of combining hypothesis with your science project and why it’s a vital aspect of learning and discovery.

But that’s not all! We’ve also compiled an extensive list of 120+ exciting 5th-grade science project ideas with hypothesis, providing you with a wealth of inspiration for your next scientific adventure. Stay tuned with us to unleash the world of  5th-grade science project ideas with hypothesis  and nurture your curiosity in the process.

What Is A Good Hypothesis For A Science Project?

A good hypothesis for a science project is like a smart guess. It helps scientists figure out what they think will happen in their experiment. To make a good hypothesis, you need to use words like  if  and  then.  For example,  If I water the plant every day, then it will grow taller.  This shows what you’re going to do and what you expect to see.

In addition, a strong hypothesis also needs to be testable. That means you can experiment to see if it’s true or not. It’s like a detective’s clue that leads you to find the answer. Scientists use good hypotheses to guide their experiments and learn new things about the world. So, making a good hypothesis is an important part of any science project.

Things To Remember While Selecting A 5th Grade Science Project Ideas With Hypothesis

Here are some things to remember while selecting a 5th grade science project ideas with hypothesis:

1. Personal Interest

Choose a 5th-grade science project that interests you. Picking a topic you’re curious about makes the project more enjoyable. Whether it’s plants, animals, or space, your passion can make learning fun.

2. Age-Appropriate

Make sure the project is right for your grade level. A 5th-grade project shouldn’t be too simple or too complex. It should match your skills and what you’ve learned in school.

3. Available Resources

Check if you have access to the materials you need. Some projects might need special tools or expensive stuff. It’s essential to choose something you can do with the materials you have.

4. Safety First

Keep safety in mind. Select a project that’s safe to do at home or in school. Make sure you won’t be using anything harmful or dangerous.

5. Clear Instructions

Look for a project with clear instructions. It’s easier when you know what to do step by step. Projects with easy-to-follow directions help you succeed and learn better.

Developing A Hypothesis For Your Science Project

Developing a hypothesis for your science project is a crucial step. It’s like making an educated guess about what you think will happen during your experiment. Here are seven key points to consider while creating a hypothesis:

  • Identify the Variables: Determine the two things you’re testing in your experiment, the  if  and  then  parts. For example, if you’re testing plant growth, the variables could be  amount of sunlight  and  plant height. 
  • Be Specific: Make sure your hypothesis is clear and precise. Avoid vague or broad statements. The more specific, the better.
  • Predict the Outcome: Your hypothesis should state what you expect to happen. Will one variable cause a change in the other? State your prediction clearly.
  • Use  If-Then  Statements: Craft your hypothesis using  if-then  statements to show the relationship between the variables. For instance,  If the amount of sunlight increases, then the plant height will also increase. 
  • Keep It Testable: Ensure that your hypothesis is something you can test through an experiment. It should lead to concrete results that you can measure.
  • Avoid Bias: Make sure your hypothesis doesn’t show your personal beliefs. It should be based on research and evidence, not what you want to happen.
  • Revisit and Revise: As you conduct your experiment, be ready to adjust your hypothesis if the results don’t match your initial prediction. Science is all about learning and adapting.

120+ Exciting 5th Grade Science Project Ideas With Hypothesis In 2023

Here we have a list of 120+ exciting 5th grade science project ideas with hypothesis in 2023: 

  1. Balloon Rocket
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Hypothesis –  If I inflate a balloon and release it, then it will move forward because of the escaping air. 

  1. Moldy Bread

Hypothesis –  I think bread left in different conditions will develop mold at varying rates. 

  1. Growing Plants 

Hypothesis –  If I give plants different amounts of water, then they will grow differently. 

  1. Magnet Magic

Hypothesis –  I predict that magnets will attract some objects but not others. 

  1. Lemon Battery

Hypothesis –  I believe I can create a battery using a lemon because it is acidic. 

  1. Volcano Eruption

Hypothesis –  I expect that a mixture of vinegar and baking soda will create a volcanic eruption. 

  1. Density of Liquids

Hypothesis –  I think different liquids have different densities, and some will float on top of others. 

  1. Solar Still

Hypothesis –  I predict that a solar still can collect clean water from dirty water through evaporation. 

  1. Bouncing Balls

Hypothesis –  I believe that balls made from different materials will bounce to different heights. 

  1. Static Electricity

Hypothesis –  I think rubbing a balloon on my hair will create static electricity that attracts objects. 

  1. Fruit Battery

Hypothesis –  I expect that fruits like oranges and lemons can power a small light bulb. 

  1. Color-Changing Milk

Hypothesis –  I predict that adding soap to milk with food coloring will make colorful patterns. 

  1. Tornado in a Bottle

 Hypothesis –  I think that by swirling water and dish soap in a bottle, I can create a tornado-like vortex. 

  1. Water Filtration

Hypothesis –  I believe that by using sand and gravel, I can filter impurities from water. 

  1. Rust Formation

Hypothesis –  I predict that metal objects left in water will rust over time. 

  1. Candy Dissolving

Hypothesis –  I think that different candies will dissolve at different rates in water. 

  1. Seed Germination

Hypothesis –  If I plant seeds in various conditions, then they will sprout at different rates. 

  1. Rain Gauge

Hypothesis –  I expect that by using a simple rain gauge, I can measure rainfall accurately. 

  1. Sound Vibrations

Hypothesis –  I believe that different objects will produce different sounds when struck. 

  1. Egg Drop Challenge

Hypothesis –  I predict that if I design a protective container, the egg will survive a fall. 

  1. Paper Airplanes

Hypothesis –  I think that altering the shape of paper airplanes will affect their flight distance. 

  1. Food Preservation

 Hypothesis –  I expect that different methods of food preservation will keep food fresh longer. 

  1. Homemade Slime

Hypothesis –  I believe that mixing glue and borax will create a slimy substance. 

  1. Lava Lamp

Hypothesis –  I predict that combining oil and water with Alka-Seltzer will create a mesmerizing lava lamp effect. 

  1. Air Pressure

Hypothesis –  I think air pressure can be measured with a simple barometer. 

  1. Crystal Growth

Hypothesis –  I expect that I can grow crystals by dissolving substances in water. 

  1. Ocean Currents

Hypothesis –  I predict that hot water and cold water will create ocean currents in a container. 

  1. Rainbow in a Jar

Hypothesis –  I believe I can create a rainbow by layering different liquids with different densities. 

  1. Static Electricity Levitation

Hypothesis –  I think that static electricity can make a small object levitate. 

  1. Melting Ice

Hypothesis –  I predict that adding salt to ice will cause it to melt faster. 

  1. Potato Battery

Hypothesis –  I expect that a potato can conduct electricity and power a small device. 

  1. Pendulum Swing

Hypothesis –  I believe that the length of a pendulum will affect its swing time. 

  1. Soda Geyser

Hypothesis –  I predict that dropping Mentos candies into soda will create a geyser. 

  1. Chromatography

Hypothesis –  I think I can separate the colors in markers using chromatography. 

  1. Heat Transfer

Hypothesis –  I expect that different materials will transfer heat at varying rates. 

  1. Rainfall and Runoff

Hypothesis –  I predict that if I simulate rainfall on different surfaces, some will produce more runoff. 

  1. Fizzy Lemonade

Hypothesis –  I believe that combining lemon juice and baking soda will make lemonade fizzier. 

  1. Rock Identification

Hypothesis –  I think I can identify different rocks by their characteristics. 

  1. Straw Oboe

Hypothesis –  I predict that by cutting a straw, I can make it produce musical sounds like an oboe. 

  1. Taste Perception

Hypothesis –  I expect that people’s taste perception may change when their sense of smell is altered. 

  1. Color-Changing Flowers

Hypothesis –  I believe that adding food coloring to water will change the color of white flowers. 

  1. Solar Cooker

Hypothesis –  I predict that a solar cooker can cook food using only the sun’s energy. 

  1. Tornado Formation

Hypothesis –  I think that rotating two bottles will create a tornado effect. 

  1. Vinegar and Baking Soda Rocket

Hypothesis –  I expect that mixing vinegar and baking soda in a bottle will launch it into the air. 

  1. Popsicle Stick Bridge

Hypothesis –  I predict that I can build a strong bridge using only popsicle sticks and glue. 

  1. Rainfall Patterns
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Hypothesis –  I believe that rainfall patterns can be different in various parts of the world. 

  1. Chemical Reactions

Hypothesis –  I think mixing certain chemicals will result in a visible reaction. 

  1. Fruit Decomposition

Hypothesis –  I predict that different fruits will decompose at different rates. 

  1. Balancing Act

Hypothesis –  I expect that I can balance various objects on a pivot point. 

  1. Photosynthesis Simulation

Hypothesis –  I believe that using a simple setup, I can show how plants perform photosynthesis. 

  1. Sinking and Floating

Hypothesis –  I think that objects with different densities will either sink or float in water. 

  1. Tooth Decay

Hypothesis –  I predict that different liquids will affect teeth differently, simulating tooth decay. 

  1. Rainwater Collection

Hypothesis –  I expect that by using a funnel, I can collect rainwater efficiently. 

  1. Soundproofing

Hypothesis –  I think that different materials will block sound to varying degrees. 

  1. Egg in a Bottle

Hypothesis –   I predict that I can place a peeled hard-boiled egg into a bottle without breaking it.  

  1. Water Wheel

Hypothesis –   I believe that the flow of water can make a small wheel turn.  

  1. Invisible Ink

Hypothesis –   I expect that I can create invisible ink that reveals messages under certain conditions.  

  1.  Heat from the Sun

Hypothesis –   I predict that a dark-colored object will get hotter in the sun than a light-colored one.  

  1. Layered Liquids

Hypothesis –   I think that liquids of different densities will form layers when mixed.  

  1. Candle Burning

Hypothesis –   I predict that different types of candles will burn at different rates.  

  1. Buoyancy with Clay Boats

Hypothesis –   I believe I can make clay boats that float and carry small loads.  

  1. Oobleck

Hypothesis –   I expect that a mixture of cornstarch and water will behave strangely, like a liquid and a solid.  

  1. Magnetic Slime

Hypothesis –   I predict that adding iron filings to slime will make it magnetic.  

  1. Stalactites and Stalagmites

Hypothesis –   I think I can grow stalactites and stalagmites using a simple solution.  

  1. pH Testing

Hypothesis –   I expect that different substances will have varying pH levels, which can be tested with indicator paper.  

  1. Solar Still for Drinking Water

Hypothesis –   I believe that a solar still can produce clean drinking water from saltwater.  

  1. Sundial

Hypothesis –   I predict that I can create a sundial that tells time using the sun’s shadow.  

  1. Dissolving Sugar

Hypothesis –   I expect that sugar will dissolve faster in hot water than in cold water.  

  1. Balloon Inflator

Hypothesis –   I think that a chemical reaction in a bottle can inflate a balloon.  

  1. Baking Soda and Vinegar Boat

Hypothesis –   I predict that a boat made from materials like baking soda and vinegar will move.  

  1. Oil Spill Cleanup

Hypothesis –   I believe that using different materials can help clean up an oil spill in water.  

  1. Seed Dispersal

Hypothesis –   I predict that seeds can be dispersed in various ways, such as by wind or animals.  

  1. Lemonade Sweetness

Hypothesis –   I expect that lemonade sweetness can be adjusted by adding sugar in different amounts.  

  1. Density of Solids

Hypothesis –   I think different solid objects will have different densities, which can be measured.  

  1. Making Ice Cream

Hypothesis –   I predict that I can make ice cream by mxing ingredients and using ice and salt.  

  1. Conduction and Insulation

Hypothesis –   I believe that different materials will either conduct or insulate heat.  

  1. Centrifugal Force

Hypothesis –   I predict that spinning an object will create a centrifugal force that affects its path.  

  1. Balloon-Powered Car

Hypothesis –   I expect that a car powered by a balloon will move because of the escaping air.  

  1. Candle Extinguisher

Hypothesis –   I think that covering a candle with a glass will extinguish it by using up the oxygen inside.  

  1. Water Filter Comparison

Hypothesis –   I predict that different water filters will remove impurities to varying degrees.  

  1. Capillary Action

Hypothesis –   I expect that water will rise differently in materials with varying capillary action.  

  1. Static Electricity and Salt

Hypothesis –   I believe that salt can be moved with static electricity.  

  1. Food Coloring in Flowers

Hypothesis –   I predict that adding food coloring to water will change the color of flowers.  

  1. Bottle Trombone

Hypothesis –   I think I can make a simple trombone-like instrument using a plastic bottle.  

  1. Windmill Power

Hypothesis –   I expect that a windmill can generate power when exposed to wind.  

  1. Chewing Gum Flavor

Hypothesis –   I predict that the flavor of chewing gum changes over time as it’s chewed.  

  1. Yeast Balloons

Hypothesis –   I believe that yeast will produce gas that can inflate a balloon.  

  1. Water Wheel Efficiency

Hypothesis –   I think that the design of a water wheel affects its efficiency in generating power.  

  1. Simple Electric Circuit

Hypothesis –   I expect that I can make a light bulb glow by completing an electric circuit.  

  1. Sugar Crystal Lollipop

Hypothesis –   I predict that sugar crystals will grow on a string dipped in a sugary solution.  

  1. Temperature and Magnetism
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Hypothesis –   I believe that magnets will behave differently at various temperatures.  

  1. Styrofoam and Acetone

Hypothesis –   I expect that acetone will dissolve styrofoam.  

  1. Starch in Foods

Hypothesis –   I think I can test for the presence of starch in different foods using iodine.  

  1. Balloon-Powered Boat

Hypothesis –   I predict that a boat powered by a balloon will move on water.  

  1. Melting Chocolate

Hypothesis –   I expect that chocolate will melt at different rates when heated.  

  1. Air Pollution and Plant Growth

Hypothesis –   I believe that exposing plants to air pollution will affect their growth.  

  1. Simple Motor

Hypothesis –   I predict that I can build a simple motor that turns when an electric current flows through it.  

  1. Lemon Battery Voltage

Hypothesis –   I expect that different fruits will produce varying amounts of electricity when used as batteries.  

  1. Fireworks in a Jar

Hypothesis –   I think that mixing oil and colored water will create a fireworks-like display in a jar.  

  1. Bending Water with Static Electricity

Hypothesis –   I predict that static electricity can bend a stream of water from a faucet.  

  1. Soda Can Fizz

Hypothesis –   I expect that dropping a mentos candy into a soda can will cause fizzing.  

  1. Tornado Tube

Hypothesis –   I believe that connecting two plastic bottles with a tornado tube will create a vortex.  

  1. Magnetic Attraction and Distance

Hypothesis –   I predict that magnets will attract objects from varying distances.  

  1. Heat Absorption by Colors

Hypothesis –   I think that objects of different colors will absorb heat differently under sunlight.  

  1. Lemon Battery Power

Hypothesis –   I expect that a lemon battery can power a small LED light.  

  1. Strawberry DNA Extraction

Hypothesis –   I believe I can extract DNA from strawberries using common household items.  

  1. Marshmallow Density

Hypothesis –   I predict that marshmallows of different shapes and sizes have different densities.  

  1. Balloon-Powered Windmill

Hypothesis –   I think a windmill with balloons will turn when exposed to air.  

  1. Spinning Colors

Hypothesis –   I expect that spinning a color wheel will create the illusion of blending colors.  

  1. Sound and Vibration

Hypothesis –   I predict that different objects will create different sounds when struck and vibrate differently.  

  1. Rock Erosion

Hypothesis –   I believe that different rocks will erode at varying rates when exposed to water.  

  1. Air Pressure and Crushed Can

Hypothesis –   I expect that changing air pressure will crush an empty can.  

  1. Straw Flute

Hypothesis –   I think that cutting and blowing through a straw can produce musical notes.  

  1. Bottle Rocket

Hypothesis –   I predict that a bottle rocket filled with water and pressurized air will launch into the air.  

  1. Fruit Electricity

Hypothesis –   I believe that different fruits can produce electricity using simple circuits.  

  1. Melting Snow and Ice

Hypothesis –   I expect that different substances can help melt snow and ice at varying rates.  

  1. Plant Growth in Different Soils

Hypothesis –   I think that different soils will affect the growth of plants differently.  

  1. Static Electricity and Salt and Pepper

Hypothesis –   I predict that salt and pepper can be moved with static electricity.  

  1. Floating Paperclip

Hypothesis –   I expect that surface tension can make a paperclip float on water.  

  1. Crayon Melt Art

Hypothesis –   I believe that crayons will melt and create art when heated.  

  1. Balloon-Powered Hovercraft

Hypothesis –   I predict that a hovercraft powered by balloons will glide over a smooth surface.  

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Importance Of 5th Grade Science Project Ideas With Hypothesis For Students 

In this section, we will discuss the importance of 5th grade science project ideas with hypothesis for students: 

1. Hands-On Learning

5th-grade science projects with hypotheses offer students a chance to learn through doing. They get to experiment, make predictions, and see the real-world results. This hands-on approach helps students grasp scientific concepts better.

2. Critical Thinking

These projects encourage critical thinking. Students have to come up with educated guesses (hypotheses) and then analyze their experiments’ outcomes. It teaches them to think logically and solve problems.

3. Curiosity and Exploration

Science projects fuel curiosity. They allow students to explore topics they find interesting, making learning more engaging. This curiosity can spark a lifelong interest in science.

4. Application of Knowledge

The things that students have learned in school can be used in real life. It helps them understand that science is not just in books, but all around them. This makes their education more useful.

5. Confidence Building

Successfully completing a science project with a hypothesis can boost a student’s confidence. They see that they can tackle challenging tasks and find solutions. This confidence can extend to other areas of their education and life.


Understanding what makes a good hypothesis is the first step in any 5th-grade science project with a hypothesis. It’s all about making educated guesses and having clear  if-then  statements. Remember to choose a project that matches your interest, is safe, and fits your grade level. With over 120 exciting 5th-grade science project ideas with hypothesis, you have a world of possibilities to explore. 

Moreover, these projects offer hands-on learning, boost critical thinking, and ignite curiosity. They let you apply what you’ve learned in school to real life. Completing these projects can build your confidence, showing that you can tackle challenges and make discoveries. So, dive into the world of 5th-grade science project ideas with hypothesis and start your exciting scientific journey!