Q a) Distinguish between Combination and Decomposition reactions (two points)
b)Write the nature of the salt-K2SO4. Also Identify the acid and the base from which it is prepared
c)Tooth cavities are very common these days, specially in kids.
i) Name the layer on our dentine whose degeneration leads to tooth decay
ii) Give two ways by which we can prevent this degeneration.
Answers
Answer:
Reactions in which reactants combine together to give one product is called combination reaction whereas decomposition reaction ia a type of reaction in which reactants break into many products.
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Answer:
Combination reaction:-
It is a chemical reaction in which two or more reactants combine with each other to form a new single product.
It releases heat during the chemical reaction.
This means that it is exothermic .
Examples :-
1) 2H₂ + O₂ ---->2H₂O
2) 2Mg + O₂ --->2MgO
Decomposition reaction:-
It is a chemical reaction in which one reactant breaks down into simpler compounds.
It absorbs heat from the surroundings during the chemical reaction.
IN other words , it is endothermic .
Examples :-
CaCO₃ ===> CaO + CO₂
2H₂O ===> 2H₂ + O₂