Question

An experiment is performed to measure the mass percent of caco3(s) in eggshells. Five different samples of caco3(s) of known mass react with an excess of 2. 0mhcl(aq) in identical sealed, rigid reaction vessels. The pressure of the gas produced is measured with a pressure gauge attached to the reaction vessel. Since the reaction is exothermic, the reaction system is cooled to its original temperature before the pressure is recorded. The experimental data are used to create the calibration line below.

Answer 1

The modification that produces the greatest increase in the rate of reaction is using more finely divided eggshells.

Rate of reaction

The term rate of reaction refers to how quickly reactants are consumed or how quickly products are formed. An exothermic reaction is one in which heat is given off.

The rate of reaction of solids is greatly influenced by surface area. If the eggshells are finely divided, the surface area is increased. Hence, the modification that produces the greatest increase in the rate of reaction is using more finely divided eggshells.

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