Question

iii) Explain the term combination reaction with examples. iv) What is meant by specific heat capacity​

Answer 1

Answer:

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Explanation:

Combination reaction: It is a reaction in which two reactants combine together to form a single product.

e.g.

(Qiuck lime)CaO + (Water)H 2 O → (Slaked lime)Ca(OH) 2 +Heat

As heat is released in this reaction, so it is exothermic reaction.

Answer 2

Combination reaction ⸻➤

A chemical reaction in which two or more substances ( elements or compounds ) combine to form a single substance is called Combination reaction.

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The combination reaction are of three types :-

• Combination between two elements: e.g., 2H2(g) + O2(g)⸻➤2H2O(l)

N2(g) + 3H2(g) ⸻➤2NH3(g)

C(s) + O2(g) ⸻➤CO2(g)

• The combination reactions( as shown above) in which a new compound is formed from its constituent elements are also called synthesis reactions.

• Combination between two compounds : e.g., CaO(s) + H2O(l) ⸻➤Ca(OH)2(aq)+ heat . [ CaO - quicklime , Ca(OH)2 - slaked lime).

Note : This is an example of exothermic reaction.

NH3(g) + HCl(g) ⸻➤NH4Cl(s)

[ NH3 - Ammonia , NH4Cl- Ammonium chloride].

Note: The reaction ( between NH3 and HCl ) is used as a test to dectect the presence of NH3. During this reaction, white fumes ( due to the formation of NH4Cl) can be seen.

• Combination reaction between an element and a compound: e.g., 2CO(g)+

O2⸻➤2CO2(g)

2NO(g) + O2(g) ⸻➤2NO2(g).

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specific Heat capacity ⸻➤

• It is the amount of heat required to increase the temperature of the substance per unit mass. S.I. unit is J/kg K.

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