physical and chemical science experiments

Five Physical and Chemical Changes Experiments

Science friend, are you looking for physical and chemical change activities to engage and motivate students? These five activities will have students differentiate the differences between a physical change and a chemical change while having a lot of fun. Depending on your classroom, you may choose to do these as demonstrations or allow students to work in small groups. 

What is the difference between a physical change and a chemical change?

A physical change is a change in the size, shape, or state of matter. 

A chemical change is a change that creates something new. 

If you are new to teaching physical and chemical changes or would like a breakdown of how to teach this unit, click here . 

Physical and Chemical Changes Experiments

Physical and chemical change experiment #1 : baking soda and vinegar.

This experiment is an easy win to incorporate into your physical and chemical changes unit if you are on a budget . Baking soda and vinegar are two staples in most kitchens. Bring these materials into your classroom. 

Once you combine the two materials, students will be able to see bubbles form. Bubbles are one way to tell that a chemical change has occurred as it is a new substance that forms when baking soda and vinegar combine. 

Chemical and Physical Change Experiment #2: Naked Eggs

This activity will take a few days to observe before seeing the results but is a great example of a chemical change. To complete this experiment, you will need: 

• White vinegar

Discuss with the students about the egg. Then, ask them to predict what they think will happen when the vinegar meets the egg. Throughout the 3 days, students should see that the eggshell breaks down because of the acid in the vinegar. Eventually, the entire eggshell will disappear, leaving just the insides of the egg. 

Why does this happen? This chemical change occurs because the egg actually has little holes in its shell. The vinegar, an acid, finds its way into these tiny holes and started to break it down. However, the egg’s insides will remain intact because there is a membrane surrounding it that holds everything together. 

Chemical and Physical Changes Experiment #3: Gas Balloons

Another fun but easy experiment to use in your classroom involves soda and a balloon. Take a 1-liter bottle of any brand of soda and place a balloon around the mouth of the bottle. 

This experiment will need about ten minutes to see the changes. 

Over time, students should observe that the balloon begins to fill up and grow larger. 

This experiment can be used to see if students are thinking critically about examples of chemical and physical changes. For example, while I teach students that bubbles can indicate a chemical change, the bubbles need to be a new substance. Since the bubbles are already in the soda bottle, this is not a chemical change. However, the size of the balloon is growing because the carbon dioxide from the soda is spreading out to fill the space in the balloon, which is a physical change. 

Physical and Chemical Changes Experiment #4: Does surface area affect the rate of melting?

This activity is another one to observe a physical change. The materials are simple,

• a timer, and

Students will use the timer to calculate how long it takes ice cubes of different sizes and shapes to melt. Then, students can make comparisons for crushed or cubed ice. Next, have students use the ruler to determine the surface area of the cubes – but caution them from touching the cubes as their body heat will affect the melting rate. 

Since this activity is monitoring a change of the state of matter, it is a physical change. However, students will enjoy working with the ice cubes, and the simplicity of this activity is perfect for integrating into your science classroom. 

Chemical and Physical Changes Experiment #5: Digestion

Reinforce the concept that science happens in our bodies, including physical and chemical changes. For example, this experiment will mimic how the muscles of our bodies help to break down food in the human body to be digested. 

For this experiment, you will need: 

• 2 Ziploc bags
• Various food inside the bag
• 1/2 c Water

Fill the same types of food inside each bag trying to keep them as similar as possible. Pour about 1/2 c of water into each bag. Set your time for 5 minutes. Allow the bags to remain as they are. 

After 5 minutes, mimic the stomach muscles moving to break down the food. Often, this is a classroom demonstration, so I will call students up to squeeze the bag to resemble stomach muscles. 

Put the bags down, have students make observations, wait another five minutes and repeat. Students should observe that the food in the bag that has muscle contractions will break down more than the other bag. 

While this demonstration shows a physical change, remind students that acids and enzymes help to further break down food which is a chemical change. 

These are 5 super easy experiments to integrate into your physical and chemical changes unit. If you are looking for ready-made resources to use, check out the following: 

• 8 Chemical and Physical Changes Experiments
• Physical and Chemical Changes Unit
• How to Teach a Unit on Chemical and Physical Changes

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5 Ideas for Physical & Chemical Change: Experiments & Demonstrations They’ll Love

These ideas aren’t your average science experiments! We’re going to dig deeper with conservation of matter, CER, and a phenomenon-based science unit.

There are MANY physical and chemical changes you can observe, but here are 5 of my favorites for upper elementary. Many of these ideas include a focus on conservation of matter because the two concepts go hand in hand.

Physical changes are changes to the appearance or form of a substance, but the substance itself is not changed into a new substance. Chemical changes involve a substance changing into a new substance with different properties.

1. 🥛 Soda Surprise Investigation

This scenario is provided at the beginning of the chemical change unit . Students discuss the scenario then investigate what occurs when soda and milk are mixed. Warning: It’s pretty gross but makes for a meaningful introduction!

Try it on your own or see the unit on TpT: Chemical Change Phenomena-based Science

2. 🎈 Baking Soda & Vinegar Balloon

Take the traditional baking soda and vinegar reaction and add a balloon . When a balloon of baking soda is placed over a graduated cylinder of vinegar in a closed system , you can more easily observe the production of a gas. The reaction occurs and the balloon inflates!

There are many variations of this investigation from simple observation to experimental design to proving the conservation of matter.

This station is part of a stations set on TpT: Physical and Chemical Change Stations

3. 🌟 Glow Sticks

The glow stick is the perfect item to explore chemical change.

It’s cheap.

It’s not messy.

It’s a closed system.

Measure the mass of the glow stick before and after the chemical reaction to demonstrate the conservation of matter.

Try it on your own or see the unit on TpT: Conservation of Matter Phenomena-based Science

4. 🍬 Dissolving Sugar Cubes

Dissolving is a simple observable physical change. I like sugar cubes for ease. In this lab, students demonstrate the conservation of matter while observing a physical change.

• balance or scale
• beaker with 100 ml water
• sugar cubes
• stirring rod/craft stick
• Measure the mass of the cup.
• Add 100 ml of water to the cup.
• Measure 25 g of sugar cubes.
• Add the sugar cubes to water and stir to dissolve.
• Measure the mass of the solution. Be sure to subtract the mass of the cup.

5. 🥤 Mentos + Diet Coke Demonstration

A fun way to wrap up your unit? Do the classic Mentos and Diet Coke demonstration! 

Ask students to determine whether a physical change or chemical reaction occurred .

This one is tricky because it certainly seems like a chemical reaction similar to baking soda and vinegar, but it’s actually a physical reaction. Tiny bumps along the candy’s surface make the bonds between water and carbon dioxide easily broken, bubbling up, and resulting in that cool eruption.

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Experiments: Physical and Chemical Changes

Burn a sugar cube.

Safety Rules: Parent supervision Take care with fire or heat Do it outdoors Materials you need are: 3 sugar cubes (from the supermarket) powdered carbon (e.g. remnants of a campfire, cigarette ash) matches

Try burning the sugar cube with the lit match first. It shouldn't burn.

Now dip the sugar cube in cigarette ash (carbon) and light it again. It should light much more easily.

The carbon heats up and raises the temperature of the surrounding sugar crystals to the ignition temperature required for the sugar to burn. Once these first crystals are burning, they provide sufficient heat for the neighbouring crystals to continue burning.

Materials you need are: 1 ⁄ 4 cup of water food colouring 1 ⁄ 2 cup of cornstarch 1 ⁄ 4 cup of cold cream small brushes small container plastics spoons

Mix cornstarch, water and cold cream together thoroughly. Spoon into containers, one for each colour. Add food colouring to each container of face paint. Use brushes to paint faces.

This face paint washes of with soap and water.

How Much Oxygen is in Air

Safety Rules: Parent supervision Take care with fire or heat Materials you need are: a large clear container a smaller clear container water a small candle a small light dish on which the candle floats matches

Set up the materials as in the diagram. Light the candle and put the cover over it last. Wait a few minutes until the candle goes out. Watch the water in the small container rise.

Oxygen takes up almost 20% or one-fifth of air. When all of the oxygen in the container has been used in burning the candle, it will be replaced by the water rising.

Invisible Ink

Safety Rules: Parent supervision Take care with fire or heat Materials you need are: freshly-squeezed lemon juice a toothpick or a fine stick as a pen a sheet of paper a candle matches

The 'ink' is the lemon juice. Dip the toothpick or fine stick into the lemon juice and write your name on the paper. Allow it to dry completely. Light the candle and hold the paper above the flame so that heat only burns the lemon juice writing but not the paper.

The ignition temperature needed to burn the sugar in the lemon juice is lower than that of the paper.

Snuff Out a Candle with a Copper Coil

Safety Rules: Parent supervision Take care with fire or heat Materials you need are: thick copper or aluminium wire (about 30 centimetres long) a candle matches

Make a coil of wire with either thick copper or thick aluminium wire. Hold the cold wire coil over a burning candle for a short time. The candle should go out.

The fire is extinguished because the coil of wire conducts heat away from the flame so fast that the temperature below the ignition temperature.

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Physical And Chemical Changes Activities For Middle School: Discussions, Experiments, Observation, And Other Resources

January 2, 2024 //  by  Elizabeth Weinick

Let’s face it – distinguishing between physical and chemical changes is not as easy as differentiating between cutting paper versus an exploding model volcano. There are many misconceptions that make the two concepts difficult for learners to understand! Middle schoolers must have a solid understanding of these concepts in order to apply their knowledge to bigger concepts in later grades. Here are 27 easy-prep, memorable and hands-on activities for middle schoolers to defy their misconceptions about physical and chemical changes and master the basics!

1. An Introduction to Physical and Chemical Changes

This introduction to physical and chemical changes includes a video, discussion questions, a vocabulary review, an activity guide, and assessments. The video is engaging and relatable for middle schoolers!

Learn More: Generation Genius

2. Skittles Science

You can dissolve skittles to investigate the question at the end of the rainbow – is this a physical or chemical change? You can vary the experiment by using different temperatures of water, white vinegar, or even lemonade to discover what happens.

Learn More: Science Sparks

3. Baking Chemistry

Explore chemical changes with baking! Sabrina talks about changes that can’t be undone in this episode of Crash Course Kids. She clearly defines chemical changes and provides a yummy experiment to enjoy after learning!

Learn More: Crash Course Kids

4. Naked Egg

Egg-xamine chemical and physical changes with eggs! This website provides several ways to observe the swelling and shrinking of de-shelled eggs in different liquids. This is also a great option to practice measuring and calculation skills while learning how different liquids affect the eggs’ mass.

Learn More: Exploratorium

5. Maximize Science!

Max captures young scientists’ attention in this video by creating huge versions of typical science experiments. Max investigates the chemical reaction that occurs to create light in a glow stick and the physical change for rock candy before creating a giant version of each!

Learn More: Science Max

6. Tarnished Coins

If you are curious why the Statue of Liberty is green, this activity explains the chemical reaction that happened over time to cause the color to change. This experiment model this oxidation with pennies.

Learn More: wikiHow

7. Dissolving Cups

While you may think watching a styrofoam cup disappear before your eyes is a chemical change, it is actually a physical change! Your children will be amazed to watch the bubbles that appear and learn why this is actually a physical change.

Learn More: Resource Center

8. Elephant Toothpaste

You can create toothpaste that would be perfect for an elephant! The product of this chemical reaction is a large foamy mess that is fun and kid-safe. You may want to dive deeper into why hydrogen peroxide produces this fun substance. 

Learn More: Imagination Station Toledo

9. Erupting Diet Coke and Mentos

You know your middle schools are itching for an explosion! Drop mentos into diet coke and squeal while everyone runs to a safe distance to watch the eruption. You can dismantle the misconception that an explosion always means a chemical reaction.

Learn More: Science B uddies

10. CSI Lab

You can bring a CSI television experience into your home with this “Case of the Missing Cake” activity! You and your children must use knowledge of chemical and physical changes to test samples of known and unknown substances to determine which suspect is the culprit!

Learn More: Mrs. Willyerd’s Virtual Classroom

11. Lemon Science

You can make a smaller version of the classic volcano by using a lemon! You may enjoy the low prep and easy-to-find materials needed. The best part is you can see the reaction occurring on the top of the lemon!

Learn More: Learning Lessons with Mrs. Labrasciano

12. Sort it Out

While experiments are a great visual, students also need concrete activities to solidify their knowledge of vocabulary and definitions. Here is a card sort to identify the differences between changes with both words and pictures to help struggling learners.

Learn More: Teaching with Elly Thorsen

13. Create Glow Sticks

We are always amazed at after-dark events with glow sticks! Students will love learning what chemicals must mix to produce the light that entrances us and why that “crack” is important for the change.

Learn More: A Dab Of Glue Will Do

14. Stained Shirt

If you have ever ruined a shirt with bleach, this experiment explains why bleach so powerfully takes over! This experiment is a great hands-on, team project to get all learners involved.

Learn More: Super Sass and Science Class

15. Misconceptions Explained

For struggling learners, this animation breaks down the complex language involved in chemical and physical reactions through an interaction between a scientist and a bunsen burner. They identify many misconceptions, so you may want to discuss with your students which misunderstandings they were surprised about!

Learn More: Smithsonian Science Education Center

16. Air Balloons

Here is a twist on the classic chemical reaction that occurs when you mix baking soda and vinegar! Add a balloon to the top of the container and watch in amazement. You can find out why the chemical reaction causes the balloon to react in this way.

Learn More: Education.com

17. Browning Apples

This experiment proves that we see chemical reactions so often and do not even realize it! Students will explore why the enzymes in apples react with oxygen- and how to prevent this!

Learn More: Purdue

18. Digestion in a Bag

This step-by-step activity puts the knowledge of chemical reactions to use as students investigate how our bodies break down food into small parts to create energy for our bodies. Students will create a model stomach in a ziplock bag!

Learn More: Discovery @ Home

19. Chemical Changes in Everyday Materials

Scientist Jared explains how chemical reactions can happen quickly or slowly. He does this with simple everyday materials, such as tin and fire, and ingredients to make bread.

Learn More: Fun Science Demos

20. Pumpkin Science

Perfect for a fall activity, this experiment allows students to follow the decomposition cycle of a pumpkin and discover what physical and chemical changes are occurring. You may want to supplement this experiment with the books provided!

Learn More: Teaching Muse

21. Popcorn is Physical

You can incorporate chemical and physical reaction learning into snack time! Learners often think physical changes are reversible, however, popcorn is the perfect example of a physical change that we cannot return to the original kernel state. Discuss as you make this snack!

Learn More: Edventures with Kids

22. Get the Scoop on Dairy Products

This lesson allows higher learners to apply their knowledge of physical science to determine what type of changes occur when turning milk into cheese, butter, yogurt, ice cream, whip cream, and other dairy products.

Learn More: Agriculture in the Classroom

23. Make Plastic from Milk

Learn how chemical changes can create something new and usable! Learners can create their own own toys, beads, and more by getting different substances to react with milk. Read on to find out the chemistry and history behind this process!

Learn More: STEAM Powered Family

24. Explore Physical and Chemical Changes in Everyday Life

We don’t always see the explosive attractions that come with chemical and physical reactions. Students can understand that they are seeing these changes in their daily life with stations such as salt and water mixtures, rusted nails, and a browned banana.

Learn More: Bright in the Middle

25. Physical and Chemical Weathering Activities

This project applies concepts of chemical and physical changes to another science topic- weathering! Students can complete these activities with sugar cubes and graham crackers to explore why statues are weathered and why sinkholes occur.

Learn More: The Owl Teacher

26. Kool-Aid Chemical Reactions

While making typical kool-aid is a physical change, complete this experiment with different types of liquids to see how the substance reacts! You may choose between lemon juice, apple cider vinegar, and kool-aid water to see the changes that occur.

Learn More: Teaching Science with Lynda R. Williams

27. Kitchen Science

You can teach physical and chemical properties while baking! You may choose to discuss why common baking ingredients have certain properties, then, enjoy the tasty reward at the end!

Learn More: iExplore Science

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45 Cool Chemistry Experiments, Demos, and Science Fair Projects

Don’t forget your safety equipment!

Bunsen burners, colorful chemicals, and the possibility of a (controlled) explosion or two? Everybody loves chemistry experiments! We’ve rounded up the best activities, demos, and chemistry science fair projects for kids and teens. Try them in the classroom or at home.

Easy Chemistry Experiments and Activities for All Ages

Chemistry science fair projects.

These chemistry experiments and activities are all easy to do using simple supplies you probably already have. Families can try them at home, or teachers and students can do them together in the classroom.

Mix up some magic milk

Kids love this colorful experiment, which explores the concept of surface tension. This is one of our favorite chemistry experiments to try at home, since the supplies are so basic and the results are so cool!

Taste the Rainbow

Teach your students about diffusion while creating a beautiful and tasty rainbow. You’ll definitely want to have extra Skittles on hand so your class can enjoy a few as well!

Learn more: Skittles Diffusion

Crystallize sweet treats

Crystal science experiments teach kids about supersaturated solutions. This one is easy to do at home, and the results are absolutely delicious!

Learn more: Candy Crystals

Make elephant-sized toothpaste

This fun project uses yeast and a hydrogen peroxide solution to create overflowing “elephant toothpaste.” You can also add an extra fun layer by having kids create toothpaste wrappers for their plastic bottles.

Blow the biggest bubbles you can

Add a few simple ingredients to dish soap solution to create the largest bubbles you’ve ever seen! Kids learn about surface tension as they engineer these bubble-blowing wands.

Learn more: Giant Soap Bubbles

Demonstrate the “magic” leakproof bag

So simple and so amazing! All you need is a zip-top plastic bag, sharp pencils, and some water to blow your kids’ minds. Once they’re suitably impressed, teach them how the “trick” works by explaining the chemistry of polymers.

Learn more: Leakproof Bag

Use apple slices to learn about oxidation

Have students make predictions about what will happen to apple slices when immersed in different liquids, then put those predictions to the test! Finally, have them record their observations.

Learn more: Apple Oxidation

Float a marker man

Their eyes will pop out of their heads when you “levitate” a stick figure right off the table. This experiment works due to the insolubility of dry-erase marker ink in water, combined with the lighter density of the ink.

Learn more: Floating Marker Man

Discover density with hot and cold water

There are a lot of easy science experiments you can do with density. This one is extremely simple, involving only hot and cold water and food coloring, but the visuals make it appealing and fun.

Learn more: Layered Water

Layer more liquids

This density demo is a little more complicated, but the effects are spectacular. Slowly layer liquids like honey, dish soap, water, and rubbing alcohol in a glass. Kids will be amazed when the liquids float one on top of the other like magic (except it is really science).

Learn more: Layered Liquids

Grow a carbon sugar snake

Easy science experiments can still have impressive results. This eye-popping chemical reaction demonstration only requires simple supplies like sugar, baking soda, and sand.

Learn more: Carbon Sugar Snake

Make homemade bouncy balls

These homemade bouncy balls are easy to make since all you need is glue, food coloring, borax powder, cornstarch, and warm water. You’ll want to store them inside a container like a plastic egg because they will flatten out over time.

Learn more: Make Your Own Bouncy Balls

Create eggshell chalk

Eggshells contain calcium, the same material that makes chalk. Grind them up and mix them with flour, water, and food coloring to make your very own sidewalk chalk.

Learn more: Eggshell Chalk

Make naked eggs

This is so cool! Use vinegar to dissolve the calcium carbonate in an eggshell to discover the membrane underneath that holds the egg together. Then, use the “naked” egg for another easy science experiment that demonstrates osmosis .

Learn more: Naked Egg Experiment

Turn milk into plastic

This sounds a lot more complicated than it is, but don’t be afraid to give it a try. Use simple kitchen supplies to create plastic polymers from plain old milk. Sculpt them into cool shapes when you’re done.

Test pH using cabbage

Teach kids about acids and bases without needing pH test strips. Simply boil some red cabbage and use the resulting water to test various substances—acids turn red and bases turn green.

Learn more: Cabbage pH

Clean some old coins

Use common household items to make old oxidized coins clean and shiny again in this simple chemistry experiment. Ask kids to predict (hypothesize) which will work best, then expand the learning by doing some research to explain the results.

Learn more: Cleaning Coins

Blow up a balloon (without blowing)

Chances are good you probably did easy science experiments like this when you were in school yourself. This well-known activity demonstrates the reactions between acids and bases. Fill a bottle with vinegar and a balloon with baking soda. Fit the balloon over the top, shake the baking soda down into the vinegar, and watch the balloon inflate.

Learn more: Balloon Experiments

Assemble a DIY lava lamp

This 1970s trend is back—as an easy science experiment! This activity combines acid/base reactions with density for a totally groovy result.

Explore how sugary drinks affect teeth

The calcium content of eggshells makes them a great stand-in for teeth. Use eggs to explore how soda and juice can stain teeth and wear down the enamel. Expand your learning by trying different toothpaste and toothbrush combinations to see how effective they are.

Learn more: Sugar and Teeth Experiment

Mummify a hot dog

If your kids are fascinated by the Egyptians, they’ll love learning to mummify a hot dog. No need for canopic jars ; just grab some baking soda and get started.

Extinguish flames with carbon dioxide

This is a fiery twist on acid-base experiments. Light a candle and talk about what fire needs in order to survive. Then, create an acid-base reaction and “pour” the carbon dioxide to extinguish the flame. The CO2 gas acts like a liquid, suffocating the fire.

Send secret messages with invisible ink

Turn your kids into secret agents! Write messages with a paintbrush dipped in lemon juice, then hold the paper over a heat source and watch the invisible become visible as oxidation goes to work.

Learn more: Invisible Ink

Set popcorn dancing

This is a fun version of the classic baking soda and vinegar experiment, perfect for the younger crowd. The bubbly mixture causes popcorn to dance around in the water.

Learn more: Dancing Popcorn Experiment

Shoot a soda geyser sky-high

You’ve always wondered if this really works, so it’s time to find out for yourself! Kids will marvel at the chemical reaction that sends diet soda shooting high in the air when Mentos are added.

Learn more: Mentos and Coke Experiment

All of these chemistry experiments are perfect for using the scientific method. Form a hypothesis, alter the variables, and then observe the results! You can simplify these projects for younger kids, or add more complexity for older students.

Break apart covalent bonds

Difficulty: Medium / Materials: Medium

Break the covalent bond of H 2 O into H and O with this simple experiment. You only need simple supplies for this one. Turn it into a science fair project by changing up the variables—does the temperature of the water matter? What happens if you try this with other liquids?

Learn more: Breaking Covalent Bonds

Measure the calories in various foods

Are the calorie counts on your favorite snacks accurate? Build your own calorimeter and find out! This kit from Home Science Tools has all the supplies you’ll need.

Detect latent fingerprints

Forensic science is engrossing and can lead to important career opportunities too. Explore the chemistry needed to detect latent (invisible) fingerprints, just like they do for crime scenes!

Learn more: Fingerprints Project

Use Alka-Seltzer to explore reaction rate

Difficulty: Easy / Materials: Easy

Tweak this basic concept to create a variety of high school chemistry science fair projects. Change the temperature, surface area, pressure, and more to see how reaction rates change.

Determine whether sports drinks really have more electrolytes than other beverages

Difficulty: Medium / Materials: Advanced

Are those pricey sports drinks really worth it? Try this experiment to find out. You’ll need some special equipment for this one; buy a complete kit at Home Science Tools .

Turn flames into a rainbow

You’ll need to get your hands on a few different chemicals for this experiment, but the wow factor will make it worth the effort. Make it a science project by seeing if different materials, air temperature, or other factors change the results.

Discover the size of a mole

The mole is a key concept in chemistry, so it’s important to ensure students really understand it. This experiment uses simple materials like salt and chalk to make an abstract concept more concrete. Make it a project by applying the same procedure to a variety of substances, or determining whether outside variables have an effect on the results.

Learn more: How Big Is a Mole?

Cook up candy to learn mole and molecule calculations

This edible experiment lets students make their own peppermint hard candy while they calculate mass, moles, molecules, and formula weights. Tweak the formulas to create different types of candy and make this into a sweet science fair project!

Learn more: Candy Chemistry

Make soap to understand saponification

Take a closer look at an everyday item: soap! Use oils and other ingredients to make your own soap, learning about esters and saponification. Tinker with the formula to find one that fits a particular set of parameters.

Learn more: Saponification

Uncover the secrets of evaporation

Explore the factors that affect evaporation, then come up with ways to slow them down or speed them up for a simple science fair project.

Learn more: Evaporation

More Chemistry Experiment Science Fair Ideas

These questions and prompts can spark ideas for unique chemistry experiments:

• Compare the properties of sugar and artificial sweeteners.
• Explore the impact of temperature, concentration, and seeding on crystal growth.
• Test various antacids on the market to find the most effective product.
• What is the optimum temperature for yeast production when baking bread from scratch?
• Compare the vitamin C content of various fruits and vegetables.
• How does temperature affect enzyme-catalyzed reactions?
• Investigate the effects of pH on an acid-base chemical reaction.
• Devise a new natural way to test pH levels (such as cabbage leaves).
• What’s the best way to slow down metal oxidation (the form of rust)?
• How do changes in ingredients and method affect the results of a baking recipe?

Like these chemistry experiments? Don’t miss STEM Activities for Kids of All Ages and Interests .

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