Question

Write the formula for the following compounds using criss-cross

Method: H=1 Na=1 O=2 Cl=1 C=4 Mg=2 Ca=2 a) Calcium oxide
b) Sodium chloride
c) Water
d) Carbon dioxide

Answer 1

Explanation:

Ca O

2 2

Formula = Cao

Na Cl

1 1

Formula = NaCl

H O

1 2

Formula = H2O

C O

4 2

Formula = CO2