Write a balanced equation describing each of the following chemical reactions. (a) Solid potassium chlorate, KClO3, decomposes to form solid potassium chloride and diatomic oxygen gas.

2KClO₃  →  2KCl  +  3O₂

Explanation:

We identify the compounds for this reactions, reactants and products:

KClO₃ , KCl and O₂

Potassium chlorate can be dissociated as this:

KClO₃  → K⁺ + ClO₃⁻

and potassium chloride can be dissociated as this:

KCl → K⁺ + Cl⁻

In order to balance, we add a 2 in the chlorate and 2 in the chloride, but we unbalance the oxygen.

In chlorate we have 6 oxygen, so we must add a 3, in the product side:

2KClO₃  →  2KCl  +  3O₂

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.