Question

An unbalanced chemical equation is shown:

H2O2 → 2H2O + O2

Which of the following statements explains why the equation is not balanced?

a Two H2O2 molecules should decompose to form the given products.
b Four H2O2 molecules should decompose to form the given products.
c Two H2O2 molecules should undergo a synthesis reaction to form the given products.
d Four H2O2 molecules should undergo a synthesis reaction to form the given products.

Answer 1

A - Two H2O2 molecules should decompose to form the given products.

Step-by-step explanation:

Did the test and got it right

Answer 2

Answer:- a) Two molecules should decompose to form the given products.

Explanations:- The given equation is:
`H_2O_2\rightarrow 2H_2O+O_2`

A balanced equation must have equal number of atoms of each element. If we look at the given reaction then hydrogen peroxide is decomposing to give water and oxygen gas. Also, if we look at the H and O then left side has two H and two O where as the right side has four H and four O.

Neither H nor O is balanced. Left side has exactly half H and O as compared to the right side and so to balance this we need to multiply hydrogen peroxide by two.

The balanced equation will be:

`2H_2O_2\rightarrow 2H_2O+O_2`

Hence, choice a is correct. "Two
`H_2O_2` molecules should decompose to form the given products."