Question

Calcium metal reacts with fluorine gas to form solid calcium fluoride. When the reaction is balanced, what coefficient is in front of fluorine gas?

A. 1
B. 2
C. 7
D. 3

Answer 1

B= 2

Step-by-step explanation:

Chemical equation:

Ca + F → CaF₂

Balance chemical equation:

Ca + 2F → CaF₂

Step 1:

Ca + F → CaF₂

Left hand side right hand side

Ca = 1 Ca = 1

F = 1 F = 2

Step 2:

Ca + 2F → CaF₂

Left hand side right hand side

Ca = 1 Ca = 1

F = 2 F = 2