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Unit 19: Biology Part 2 Page 90 of 137

Experiment: Bones in vinegar; the power of calcium

Materials:

 Chicken bones

 2 Jars
 Water
 Vinegar

What to do:

1. Fill one jar with water.
2. Fill the other jar with vinegar.

3. Place one chicken bone in each jar.
4. Wait a day.
5. Take the bones out and compare. What do you notice?

What happened? The bone in vinegar became more flexible and breakable.
This is because the acid in the vinegar dissolved some of the calcium on the
bone. The calcium in our bones contribute it it’s hardness.

Experiment: Compare size and strength

Materials:

 Tape measure
 Paper

 Milk jug

Measure:

1. Find some friends.
2. Measure your biceps. Write down the measurements in the table
below.

3. With the same arm use your biceps to lift the jug of milk as many
times as you can (without hurting yourself!).
4. Write down how many times you can lift the jug in the table.

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