Balance the chemical equation

__H2O -> __ H2 + __ O2

2 H₂O → 2 H₂ + 1 O₂

Explanation:

There are 2 hydrogen atoms on both the sides of the equation. However there is 1 oxygen atom on the left side and 2 oxygen atoms on the right side. So we multiply the 1 atom with 2 to get two oxygen atoms. The equation would look like this:

2 H₂O → 1 H₂ + 1 O₂

Now if you check whether both the sides has equal number of elements, on the left side hydrogen has 4 hydrogen atoms and the right side has 2. Therefore we multiply it with 2 because that gives 4. Thus the equation is balanced.

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.