Question

Choose all the answers that apply.

Which of the following equations are balanced?

A) 2H2 + O2 → 2H2O
B) 2S + 3O2 → 2SO3
C) Li + Cl2 → LiCl
D) 2K + 2H2O → H2 + 2KOH
E) 2Fe + Cu(NO3)2 → 2Cu + Fe(NO3)2

Answer 1

Answer: A B D

Step-by-step explanation:

Answer 2

#a.2H2 + O2 → 2H2O

#b. 2S + 3O2 → 2SO3

#d. 2K + 2H2O → H2 + 2KOH

Step-by-step explanation:

• A balanced chemical equation is one that has equal number of atoms of each element on both sides of the equation.

In this case;

• 2H2 + O2 → 2H2O - is balanced since it has, 4 hydrogen atoms and 2 oxygen atoms on either sides of the equation.
• 2S + 3O2 → 2SO3, is balanced. It has 2 sulfur atoms and 6 oxygen atoms on both side of the equation.
• 2K + 2H2O → H2 + 2KOH, is balanced , 2 potassium atoms, 4 hydrogen atoms and 2 oxygen atoms on both side of the equation.

• On the other hand, the equations that are not balanced include;

1. Li + Cl2 → LiCl
2. 2Fe + Cu(NO3)2 → 2Cu + Fe(NO3)2

This is because the number of atoms of each element is not equal on both side of the equation/