Question 9:
What does one mean by exothermic and endothermic reactions? Give examples.
Answer
Chemical reactions that release energy in the form of heat, light, or sound are called
exothermic reactions.
Example: Mixture of sodium and chlorine to yield table salt
In other words, combination reactions are exothermic.
Reactions that absorb energy or require energy in order to proceed are called
endothermic reactions.
For example: In the process of photosynthesis, plants use the energy from the sun to
convert carbon dioxide and water to glucose and oxygen.
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