Glucose is the monomer in the natural polymers and cellulose.

Starch

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pure substance: iron,copper

impure substance: water,charcoal

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.