Defineendothermic and exothermic reactions. Give two examplesof each.
Answers
Explanation:
- Endothermic reaction: Endothermic reaction in which heat is absorbed by the reactants from surroundings to form products.
- Eg: CaCO₃ → CaO + CO₂
- Melting of ice cubes H₂O (solid) → H₂O (Liquid)
- Exothermic reaction: In Exothermic reaction energy is released in the form of heat or light.
- Eg: Combustion of methane
CH₄ + O₂ → CO₂ + H₂O + Heat
- Eg: Reaction of CaO with water
- CaO + H₂O → Ca(OH)₂ + Heat
Answer:
Endothermic reactions
It is a process in which the system absorbs energy in the form of heat from its surroundings.
Example: melting of ice, evapouration of water, photosynthesis
Exothermic reactions
It is a reaction that releases heat as a type of energy from the system to its surroundings.
Examples: Rusting of iron, nuclear fission, explosions.
Explanation:
In an endothermic reaction, the energy from the environment is absorbed into the reaction while in an exothermic reaction, the system's energy is released into the environment.
In an endothermic reaction, the energy is released in the form of heat. In an exothermic reaction, the energy is released in the form of heat, electricity, light, or sound.
So exothermic reaction is the opposite of endothermic reaction.