Explain (with equation)what you would observe for any reaction that occurs .
1) an iron nail is left in a beaker of magnesium sulphate solution for about 30 minutes.
2)a piece of strontium(Sr) is added to a beaker of cold water.( strontium is between calcium and barium in group ll of the periodic table)
3)a bent iron nail is left in a gel containing rust indicator for one week.
4)a piece of steel is wrapped with some copper wire and placed in a shallow dish with tap water for a day.