• What does one mean by exothermic and endothermic reactions? Give examples.
Why is respiration considered an exothermic reaction? Explain.
Why are decomposition reactions called the opposite of combination reactions?
Write equations for these reactions.
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1 Reactions and Equations
Answers
Explanation:
An exothermic reaction occurs when the temperature of a system increases due to the evolution of heat. This heat is released into the surroundings, resulting in an overall negative quantity for the heat of reaction. The chemical reactions that must absorb energy in order to proceed are known as endothermic reactions.
Exothermic reactions release heat or energy.When you or we breath out,breath is warmer.This is happened for respiration reaction of our body.
Carbolydrates present in food are broken down to form glucose.This glucose combines with oxygen in the cells of our body and provides energy.This reaction is known as respiration.hence,respiration is considered as an exothermic reaction.
In a combination reaction two or more substances are combined to form new substance while in the decomposition reaction one substance decomposes into two or more substances. Hence, the decomposition reactions are called opposite of combination reactions.
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Explanation:
1.
Exothermic reaction:-
A chemical reaction in which heat is given out.
Ex. making ice cubes, a candle flame etc.
Endothermic reaction:-
A chemical reaction in which heat is absorbed.
Ex.melting ice cubes,evaporation of water.
2.
Exothermic reaction realise heat or energy . when you or we breathe out,breathe is warmer.This is happened for respiration reaction of our body.
carbohydrates present in food are broken down to form glucose . This glucose combines with oxygen in the cells of our body and provide energy ,this reaction is known as respiration. Hence,respiration is considered as exothermic reaction.
3.
A decomposition reaction is breakdown and separation of a chemical compounds in its element or simpler compounds while in composition reaction two or more elements or compounds to form a single compound That is why decomposition reaction is called the opposite of combination reaction.