Question

observe the following chemical equation and identify the correct statement option am the reaction is chemical combination as well as exothermic reaction option B the reaction is chemical decomposition as well as endothermic reaction option see the reaction is chemical displacement as well as exothermic reaction option B the reaction is chemical combination as well as endothermic reaction

Answer 1

Exothermic Reaction

These are types of reactions where along with products, heat is also generated. For example, in the above reaction between calcium oxide and water, a large amount of heat gets produced making the reaction mixture warm. Other examples of exothermic reactions are –

Burning of natural gas

CH4(g) + 2O2 (g) → CO2 (g) + 2H2O (g)

Do you know how we get the energy to do our daily activities? The food we consume is broken down into simpler substances during digestion. For example, bread, potatoes rice etc contain carbohydrates which get broken down to its simpler form glucose. During respiration, glucose combines with oxygen in our cells and provides energy. Therefore, respiration is also an exothermic process.

C6H12O6(aq) + 6O2(aq) → 6CO2(aq) + 6H2O(l) + energy

(Glucose)

Another example of an exothermic reaction is the decomposition of vegetable matter to compost.