describe what's happening in each test tube, including any evidence of a chemical reaction.
1 - iron and copper(II) sulfate - ___
2 - copper and hydrochloric acid - ___
3 - zinc and iron(III) nitrate - ___
4 - zinc and magnesium sulfate - ___
5 - zinc and hydrochloric acid - ___
6 - iron and hydrochloric acid - ___
