Question

ans please ...................................

Answer 1

1.Ans- It will form Magnesium oxide.
2.Ans- It will form Calcium oxide and Carbon dioxide.
3.Ans- When electricity is passed through a water then then the water particles get electrically charged.
4.Ans- It will form Brown like material on the surface of Iron nail and this will lead that object too weak and broken easily..

Hope this will Help you...

Answer 2

1. It forms magnesium oxide. It is a chemical reaction.
    2Mg + 02 = 2MgO

2. If limestone is heated strongly then it breaks down to form calcium oxide(chemical reaction) and carbon dioxide. It is a chemical change.
   CaCO3 = CaO + CO2

3. It is known as electrolysis and is a chemical change. It will break down into H+ and OH- ions.
   2(H2O) = 2(H2) + O2

4. It is a chemical change and is known as oxidization. Iron reacts with oxygen to make iron oxide.
    4Fe + 3(O2) = 2(Fe2O3)