Question

the chemical equation, h₂o --> h₂ + o₂ is __. we can add coefficients to this chemical equation by adding a in front of h₂o, in front of h₂ and __ in front of o₂. unbalanced; 2; 2; 1 balanced; 2; 2; 1 balanced; 4; 2; 1

Explanation:

Step1: Check balance of original equation

In $H_2O
ightarrow H_2 + O_2$, left - hand side has 1 oxygen atom and right - hand side has 2 oxygen atoms, 2 hydrogen atoms on both sides initially. So it is unbalanced.

Step2: Balance the equation

To balance oxygen, put 2 in front of $H_2O$: $2H_2O
ightarrow H_2+O_2$. Now there are 4 hydrogen atoms on left - hand side. So put 2 in front of $H_2$ to get $2H_2O
ightarrow 2H_2 + O_2$.

Answer:

A. unbalanced; 2; 2; 1