Question

WRITE THE CHEMICAL FORMULA OF THE FOLLOWING COMPOUNDS (CRISS-CROSS METHOD)
1. ALUMINIUM OXIDE
2. AMMONIUM HYDROXIDE
3. CALCIUM SULPHATE
4. POTASSIUM BICARBONATE

Answer 1

Answer:

1. Al³ O²

×

Exchange of values

Al²O³

2. NH⁴ OH^‐

×

NH^‐OH⁴

3. Ca² So³

×

Ca³So²

I dont know 4th one sorry my dear friend

Answer 2

WRITE THE CHEMICAL FORMULA OF THE FOLLOWING COMPOUNDS (CRISS-CROSS METHOD)
1. ALUMINIUM OXIDE-Al2O3
2. AMMONIUM HYDROXIDE-NH4OH
3. CALCIUM SULPHATE-CaSO4
4. POTASSIUM BICARBONATE-KHCO3