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Question
Define endothermic and exothermic reactions.
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Solution
A reaction that needs heat for the reaction to take place is called an endothermic reaction.
- Example: Basically, when the ice consumes (heat) energy, which allows a transition to occur, melting ice is an endothermic response. The ice cube needs heat to melt, so the process is endothermic.
A reaction in which heat is given out is known as an exothermic reaction.
- Example: A negative change in enthalpy, or a loss of heat, characterises an exothermic reaction. Water vapour loses energy in the form of heat when it condenses into a liquid. This reaction is hence exothermic.
A reaction that needs heat for the reaction to take place is called an endothermic reaction.
- Example: Basically, when the ice consumes (heat) energy, which allows a transition to occur, melting ice is an endothermic response. The ice cube needs heat to melt, so the process is endothermic.
A reaction in which heat is given out is known as an exothermic reaction.
- Example: A negative change in enthalpy, or a loss of heat, characterises an exothermic reaction. Water vapour loses energy in the form of heat when it condenses into a liquid. This reaction is hence exothermic.
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