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Answer 1

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The common observation are:-

1) Evolution of heat.

2) Evolution of gases.

3) Formation of precipitation.

4) change in colour.

5) change in temperature.

2:- Respiration is considered as exothermic reaction because in respiration the organic compounds gets oxidised to liberate heat energy that's why it is in exothermic reaction.

3:- N2(g) + 3H2(g) => 2 NH3 (g)

4:- 2K(s) + 2H2O(l) => 2KOH(aq.) + H2(g)

Answer 2

hey mate here is your answer

1= The observation that tells that chemical reaction had are following:-

(1)= Evolution of gas.

(2)= Change in temperature .

(3)= Formation of precipitate.

(4)= Change in colour.

2= Respiration is considered as an exothermic reaction because energy is released/ produced in this process. It involves oxidation of food (glucose).

3= (a) :- 3H2+ N2= 2NH3

(b):- 2K+2H2O = 2KOH+ H2

it will surely help you.

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