Science Experiment: Oxidation – Brown Apples

Science Experiment: Oxidation – Brown Apples

More Science Experiments

Chemical ReactionsA chemical reaction occurs when substances are mixed together and are changed. Sometimes substances mix together and not much happens, at other times the results are dramatic and surprising.srpapple

When you cut open an apple it doesn’t look good for very long does it? After even just a few minutes an apple can start to look brown inside. The apple turns brown because when you cut the apple open you expose what’s inside the apple skin to the air,  which has oxygen in it. Oxidation is a chemical reaction that takes place when a substance combines with oxygen. When apple flesh combines with oxygen it turns brown. The browning of the apple is called oxidation.

Another kind of oxidation you probably have seen is rust. When metal comes in contact with oxygen a chemical reaction takes place – oxidation. In this case the result of oxidation is rust.

What You Need:

  • 3 Apple Slices
  • 1 Orange Slice
  • 1/2 Cup Orange Juice
  • 3 Small Plates
  • Carmel Dip and the Rest of the Apple Slices (optional)

Put one apple slice on each plate. One apple slice leave alone. Pour the orange juice over one apple slice, pour orange juice over one apple slice and  lay the orange slice on top of the last apple slice. Wait a couple hours. How do the apple slices compare? Which one is the most brown?  To investigate chemical reactions further – try some more experiments at home!

Websites, Activities, Printables & Databases:

Science in Context: oxidation is a database you can use in any IndyPL Library Branch or at home. Login using your IndyPL library card number. The Science in Context database will show you articles, images and videos to help you learn about oxidation.​



You can also ask a math and science expert for homework help by calling the Ask Rose Homework Hotline. They provide FREE math and science homework help to Indiana students in grades 6-12.


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17 Responses »

  1. I am raising 5 homeless kids and any information I get off the internet is great. Thank you.

  2. Otta – You can learn about the signs that help warn people about hazards in the workplace, like chemicals, on the the OSHA (Occupational safety and Health Administration) website. If you scroll down you will see the pictogram used on signs for Oxidizer warnings. If you want to learn about how these signs help keep lab workers safe, look at this site from Brandeis University. It talks about what oxidizers are and what students can do to safely handle them in the lab. Hope this helps – good luck!

  3. this didn’t help me so much. I want to know how it can be dangerous as I am learning about safety signs in the lab and one is ‘oxidising’. Thanks.

  4. This will be great 4 my science fair project on apple oxydation!!!!!!!!!!!!!!!!!!!!!!!

  5. This really helped with my homework. I am going to have to try that experiment one day! 🙂

  6. Fine- but it doesn’t say what in the apple flesh reacts with the oxygen. Good start- and this is helping with my holiday work.

  7. cool this will be really good for my science fair prodjekt about oxidation

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