Question

(a) write a balanced chemical equation for the process of photosynthesis and thr condition of the reaction giving physical states of all the substances . (b) Classify the follwing chemical reaction as exothermic or endothermic : (1)Electrolysis of water . (2) Burning of natural gas . (3) Decomposition of calcium carbonate . (4) Burning of magensium ribbon in air .

Answer 1

a)6CO2 +12H2O→C6H12O6+6O2+6H2O
b) (1)exothermic
(2)exothermic
(3)exothermic or thermal decomposition
(4)exothermic-not sure

Answer 2

(a) Photosynthesis is the process by which plants and other organisms make use of the energy of light to convert the carbon dioxide and water into the sugar glucose. In the photosynthesis, which provides the energy source for all virtual organisms.

$6CO_2 \ (g) + 12H_2O \ (l) \rightarrow C_6H_12O_6 \ (s) + 6O_2 \ (g) + 6H_2O \ (l)$

(b) Classification of Reactions:

Endothermic: Heat is required to begin the reaction

Exothermic: Heat is released as an output of the reaction  

(1) Endothermic as, electricity as heat is needed.

(2) Exothermic as, heat is released while burning Natural gas.

(3) Endothermic as, heat is needed to break down.

(4) Exothermic as, while reacting with oxygen it release heat.