Question

which one of the following is an example of the first law of thermodynamics? answer a as time passes, your room becom messier unless you spend ene clean it. b water will only become ice if it is in a very cold environment. c when a combustion reaction produces heat, that heat is absorbed by the air around the reaction. d a chemical ice pack feels cold because it is reducing the energy of the universe.

Explanation:

The First Law of Thermodynamics states that energy cannot be created or destroyed, only transferred or converted. Option C shows heat (a form of energy) being transferred from the combustion reaction to the surrounding air, which aligns with the First Law. Option A is related to the Second Law (entropy). Option B is about a physical change condition. Option D is incorrect as energy of the universe is conserved (First Law), not reduced.

Answer:

C. When a combustion reaction produces heat, that heat is absorbed by the air around the reaction.