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

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Edufirst

Answer:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

Explanation:

1) Word equation (given)

  • calcium chlorate (solid) → solid calcium chloride (solid)  + oxygen (gas)

2) Chemical formulae of the reactant and products:

  • Calcium chlorate:

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

  • Calcium chloride

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

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

  • Phases

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

3) Chemical equation:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + O₂ (g)

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:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)

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:

  • Ca(ClO₃)₂ (s) → CaCl₂ (s) + 3O₂ (g)
samueladesida43

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:

  • Decomposition reaction is a reaction that involves the breakdown of a single compound to form two or more elements/substances.

  • Calcium chlorate has a chemical formula of Ca(ClO3)2. It undergoes decomposition to produce calcium chloride (CaCl2) and oxygen gas (O2). The reaction is as follows:

  • Ca(ClO3)2 → CaCl2 + O2

  • However, the equation is not balanced because the number of atoms of oxygen element is not the same on both sides of the equation.

  • To balance the equation, we make use of coefficient 3 in front of the oxygen as follows:

  • Ca(ClO3)2 → CaCl2 + 3O2

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