Allow the jar to stand undisturbed for five days. Pour one tablespoon of liquid containing iron acetate into the second jar. Note and record observations. Chemical reactions do not create or destroy matter, but only rearrange the combinations of atoms in matter. In the case of the green blob, iron plus vinegar produces iron acetate.
Iron produces iron acetate.
In biological systems the same principles apply. Students will understand the chemical properties of matter and its relationship to living and non-living things.