Define parallax using your own words.

In parallax when there is distinction within apparent position of an object viewed on two completely different lines of sight. It is measured by the angle or semi-angle of inclination between those 2 lines.The apparent shift between the two objects one's sight is affected sideways is named parallax.

Answer and Explanation:

Parallax :

Parallax is nothing but the difference in position of the object when it is seen from two different line of sight.

Parallax is is the angle of inclination between these two lines

It is measured in angle

Parallax is the apparent moving wonder which happens when an item is seen from various positions.

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.