Question

state whether the statement are Exothermic,Endothermic,
Decomposition


CaCO3 ∆ CaO + CO2

C12H22O11 12C + 11H2O

CaO + H2O Ca(OH)2 + heat.​

Answer 1

Answer:

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Energy considerations

Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds. Energy is absorbed to break bonds, and energy is evolved as bonds are made. In some reactions the energy required to break bonds is larger than the energy evolved on making new bonds, and the net result is the absorption of energy. Such a reaction is said to be endothermic if the energy is in the form of heat. The opposite of endothermic is exothermic; in an exothermic reaction, energy as heat is evolved. The more general terms exoergic (energy evolved) and endoergic (energy required) are used when forms of energy other than heat are involv

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Answer 2

Question:-state whether the statement are Exothermic,Endothermic,

Decomposition

CaCO3 ∆ CaO + CO2

C12H22O11 12C + 11H2O

CaO + H2O Ca(OH)2 + heat.

Answer:-Combination reaction : Cao+CO

2

→CaCO

3

, in this reaction calcium oxide is combines with carbon dioxide to form calcium carbonate.

(b) Decomposition reaction : CaCO

3

→CaO+CO

2

, in this reaction calcium carbonate is decomposed to calcium oxide and carbon dioxide.

(c) Displacement reaction : Fe(s)+CuSO

4

(aq.)→FeSO

4

(aq)+Cu(s), in this reaction Fe displaces copper to form ferric sulphate.

(d) Analysis reaction : 2H

2

O→2H

2

+O

2

Hence, the correct option is C

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