Question

identify more examples from daily life to illustrate the increase in rate of reaction with the increase in surface area.

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Answer 1

Answer:

Every chemical reaction whether exothermic or endothermic has an energy barrier that has to be overcome before reactants can be transformed into products. If the reactant molecules have sufficient energy, they can reach the peak of the energy barrier after the collision and then they can go to the right side of the slope and consequently, change into products.

If the activation energy for a reaction is low, the fraction of effective collisions will be large and the reaction will be fast. On the other hand, if the activation energy is high, then the fraction of effective collisions will be small and the reaction will be slow.

When the temperature is increased, the number of active molecules increases, i.e., the number of effective collisions will increase and the rate of reaction will increase.

Explanation:

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Answer 2

Examples from daily life to illustrate the increase in rate of reaction with the increase in surface area are as follows:

1. Dissolution of sugar in water: Powdered sugar dissolves faster in water than when sugar crystals are dissolved in the same amount of water.
2. Adsorption of dust particles: Pollution masks have powdered activated charcoal which adsorbs dust and other harmful particles from the air.
3. Absorption of moisture by silica: Silica is kept in the gel form in new containers/vessels so as to absorb the water vapours on the silica gel.