The statement, that describes the energy moves between a system of reacting substances and the surroundings is "molecular collisions transfer thermal energy between the system and its surroundings"
What is energy?
Energy is the ability to perform tasks. Energy is a quantitative property that is transferred to a body or a physical system and is visible in the performance of work as well as in the appearance of heat and light. It can take the shape of a potential, kinetic, thermal, electrical, chemical, radioactive, or other substance. Collisions between molecules transmit energy when two bodies come into contact. Molecules transfer thermal energy to one another by collision.
The warmer body transfers more energy to the cooler body until they achieve the same temperature. This is known as thermal equilibrium. This is known as 'energy transferred as heat.'
Hence the correct answer is molecular collisions transfer thermal energy between the system and its surroundings.
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