Science Projects for Kids: Chemical Reactions

The Battle of Liver and Potato

Find out who will win in the battle of the liver and potato.
Find out who will win in the battle of the liver and potato.
©2007 Publications International, Ltd.

In the battle of liver and potato, your kids will learn a lot about little bits of food. Make sure your children are careful with sharp knives. Have them wash their hands after handling liver. Make sure they don't drink hydrogen peroxide; they should wear goggles to avoid getting hydrogen peroxide in their eyes.

What You'll Need:

  • Potato
  • Liver
  • Knife
  • Cutting board
  • Goggles
  • Hydrogen peroxide (3% solution)
  • 2 test tubes (or similar shaped glasses)
  • Ruler
  • Dish soap
  • Science stirrer (or coffee stirrer)
  • Paper and pencil

How to Create the Battle of Liver and Potato:

Step 1: Have your children cut small, equal-size pieces of raw liver and potato.

Step 2: Make sure they put on their goggles. Help your children pour hydrogen peroxide into two test tubes until it measures about one inch in each.

Step 3: Have your kids add one drop dish soap to each test tube, and make sure they stir gently.

Step 4: At the same time, they should place a piece of liver in the first test tube and a piece of potato in the second. Ask your kids which test tube produces the most bubbles? Have them record the foam heights in each test tube. Dropping pieces of liver and potato into the hydrogen peroxide results in bubbling as oxygen is released. The interaction of the bubbles with the soap solution produces a good amount of foam. Liver produces more bubbles and foam than the potato. Liver wins because it has a greater amount of catalase -- the enzyme that breaks down hydrogen peroxide.

For another bubbly project for your kids, keep reading science projects for kids: chemical reactions to learn what happens when vinegar, baking soda, and laundry detergent are combined.

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