Question

describe one change each where energy is released and absorbed respectively​

Answer 1

Answer:

exothermic- energy released

endothermic- energy absorbed

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Answer 2

Answer:

All chemical reactions involve the transfer of energy.

Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy.

Exothermic processes release energy upon completion, and are signified by a negative change in enthalpy.

Explanation:

All chemical processes are accompanied by energy changes. When a reaction proceeds, it either releases energy to, or absorbs energy from, its surroundings. In thermodynamics, these two types of reactions are classified as exothermic or endothermic, respectively. An easy way to remember the difference between these two reaction types is by their prefixes: endo- means to draw in, and exo- means to give off. We will explore these concepts in more detail after introducing the concept of enthalpy.