write the chemical formulas of :

1) Magnesium chloride.

2) Hydrogen Fluoride

3) Copper Sulphate

4) Tricalcium Silicate.

5) Barium Chloride.

6) Barium Sulphate.

7) Beryllium Iodide

8) potassium Chromate

9) Sodium dichromate.

10 ) Copper Iodide.