_Mg +_Cl2 = _MgCl2 Blance the equation

The answer to your question is   1, 1, 1

Explanation:

Data

               Mg  +  Cl₂   ⇒   MgCl₂

To balance an equation just consider the Law of conservation of Energy. That states that matter can be neither created nor destroyed. This means that the mass of reactants is equal to the mass of the products.

              Mg  +  Cl₂  ⇒  MgCl₂

  Reactants       Elements     Products

          1               Magnesium      1

          2               Chlorine           2

This equation is balanced because the number of reactants is equal to the number of products.

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.