In one scene in the movie the godfather ii,
a solid gold phone is passed around a large
table for everyone to see. suppose the volume
of gold in the phone were equal to the volume
of a 10-centimeter cube of gold. the density
of gold is 19,300 kg/m3
.
could such a phone be casually passed
around a table from hand to hand? what
is the weight of the phone? 1 kg of mass is
about 2.2 lb

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.