Which of these would have the lowest kinetic energy?
boiling water
ice water
refrigerated water
water at room temperature

ice water

Explanation: Kinetic energy is the energy possessed by a substance by virtue of its motion and is directly proportional to the temperature of substance.

R= gas constant

T= temperature

Thus boiling water will have a temperature of around , ice water will have a temperature of  , refrigerated water will have a temperature of more than , and water at room temperature will have a temperature more than refrigerated water but less than boiling water.

Thus ice water has lowest temperature and thus will have lowest kinetic energy.

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.