Write the balanced chemical equation for the following reaction. phases are optional. solid calcium chlorate decomposes to form solid calcium chloride and oxygen gas.

The balanced chemical equation for the decomposition of calcium chlorate to form oxygen and calcium chloride is as follows:

Ca(ClO3)2 → CaCl2 + 3O2

DECOMPOSITION REACTION:

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Explanation:

1) Word equation (given)

2) Chemical formulae of the reactant and products:

The most common oxidation states of chlorine are -1, +1, +3, +5, +7.

The suffix ate in chlorate means that chlorine atom is with the third lowest oxidation state (counting only the positive states). So, this is +5.

The oxidation state of calcium is +2.

Hence, the chemical formula of calcium chlorate is Ca(ClO₃)₂

The suffix ide in chloride means that chlorine is with oxidation state -1. Again the oxidation state of calcium is +2.

Hence, the chemical formula of calcium chloride is CaCl₂

Oxygen gas is a diatomic molecule, so its chemical formula is O₂.

The symbols s and g (in parenthesis) indicate the solid and gas phases respectively.

3) Chemical equation:

That equation is not balanced becasue the number of O atoms in the reactant side and in the product side are different.

4) Balanced chemical equation:

Add a 3 as coefficient in front of O₂(g), in the product side to balance:

Verify that all the atoms are balanced:

Atom    Reactant side      Product side

Ca             1                           1

Cl              2                          2

O              3×2 = 6                2×3 = 6

Conclusion: the equation is balanced and the final answer is:

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