Scientists and inventors must keep good records of the experiments they conduct. This helps them keep track of what they do and what happens. If they discover something new, they can go back to look at what they did and try it again! They also use the records to help them change and improve the experiment if something does not work.
Complete this worksheet as you go through the steps of your experiment.
Think It!
Before beginning an experiment, scientists have a hypothesis, or idea, about what will happen.
In this experiment, you will try to polish old pennies using
- Lemon juice
- Milk
- Cola
- Another liquid of your choice
Make a hypothesis, or guess, about how each liquid will work. Circle your hypothesis on the worksheet.
Try It!
Now you are ready to test your hypothesis. To conduct the experiment, you will need:
- Four (4) empty cups or glasses
- Lemon juice
- Milk
- Cola
- Another liquid of your choice
- Four (4) tarnished pennies
Follow these steps to find out what happens when you try to polish a penny with different liquids.
