3: Cleaning Pennies Lab

Cleaning Pennies Lab Report

Question

How does changing the chemical that the penny soaks in affect how clean the penny becomes?

or

Does chaning the chemical a penny soaks in affect how clean the penny is?

Or write your own hypothesis.

Research

Vinegar is an acid.

Salt has an inoic bond.

Salt speeds up mixing of ingredients? (Not sure)

Pennies are made of copper.

Copper oxidizes when air touches it.

Coins are round and have weight.

Hypothesis

If the coin is put into vinegar, then it will become clean (because the vinegar is an acid and will break the rust off the coin). (What is in paranthesis is extra.)

Materials

• 8 little cups

• individual containers with the following ingredients

  • salt

  • tomato paste

  • vinegar

  • water

  • discoloured pennies

• masking tape

Procedure

1) Fill each tiny plastic cup with the chemical mixture you will test.

1. vinegar, salt, tomato paste

2. vinegar and water

3. vinegar and tomato paste

4. vinegar and salt

5. vinegar

6. tomato paste and salt

7. salt and water

8. water

9. masking tape

2) Label the tiny cups.

3) Put one penny in each cup.

4) Wait 20 minutes.

5) Take the pennies out and wipe them off. Write observations in chart.