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AS DULL AS DISHWATER

Use some simple chemistry to make your dull coins shine again

Suitable For

Grade 4

Difficulty

2

Time Required

 <1 Hour

Supervision

Advised

What’s it about?

A ‘chemical reaction’ in simple terms is the breaking apart of substances to form new substances. Use some simple chemistry in the following science experiment to make your dull looking coins shine again:

Topics covered

Chemical reaction

What will I need?

  • GLASS JAR
  • DULL, DIRTY COPPER PENNIES
  • 125ml LEMON JUICE
  • TIMER
  • WOOL CLOTH

Procedure (Method)

Unfortunately, this section is only available in the e-book version of the project.

How does it work?

Unfortunately, this section is only available in the e-book version of the project.

Over time, oxygen in the air combines with the copper in the coins to form a copper oxide coating that make the coins look dull and dirty. This science experiment works because when the dull & dirty coins are placed in the lemon juice, a chemical reaction takes place. The acid of the lemon juice acts chemically to break down and remove the copper oxide, making the pennies look like new!

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