Q3 of 37 Page 7

Name one reaction which is accompanied by the evolution of heat.

All reactions which are Exothermic are accompanied by evolution of heat. One such example is burning of methane. Reaction is as Follows:

CH4(g) + 2O2 (g) → CO2 (g)+ 2H2O (g)


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1

Identify the type of reaction:

(i) CH4(g) + 2O2(g) → CO2(g)+ 2H2O(g)


(ii) 2NaCI(l) 2Na(s) + Cl2(g)


(iii) MnO2 + 4HCI MnCl2 + 2H2O+ Cl2

 2

What happens when hydrogen gas is added to copper oxide?

 4

Name the type of reaction for the following:

(i) Vegetable matter changing into compost.


(ii) Burning of natural gas.

 5

Write the four factors responsible for the corrosion of iron.