Combustion of hydrocarbons such as methane (CH) produces carbon dioxide, a "greenhouse gas." Greenhouse gases in the Earth's atmosphere can trap the Sun's heat, raising the average temperature of the Earth. For this reason there has been a great deal of international discussion about whether to regulate the
production of carbon dioxide.
1. Write a balanced chemical equation, including physical state symbols, for the
combustion of gaseous methane into gaseous carbon dioxide and gaseous water.
2. Suppose 0.250 kg of methane are burned in air at a pressure of exactly 1 atm and
a temperature of 12.0 °C. Calculate the volume of carbon dioxide gas that is
produced. Be sure your answer has the correct number of significant digits.

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.