Question

In: Chemistry

(a) Select all of the correct statements about reaction rates from the choices below. The lower...

(a) Select all of the correct statements about reaction rates from the choices below.

The lower the rate of a reaction the longer it takes to reach completion.


A balanced chemical reaction is necessary to relate the rate of reaction to the concentration of a reactant.


The rate of a fast step has more effect on the overall reaction rate than the rate of a slow step.


Solid catalysts increase reaction rates as their surface areas increase.


Slow reactions can be speeded up by raising the temperature.


Reactions involving very unstable combinations of chemicals have small rate constants.


Reaction rates always increase as masses of solid reactants increase.

Solutions

Expert Solution

The lower the rate of a reaction the longer it takes to reach completion. TRUE, it takes more time

A balanced chemical reaction is necessary to relate the rate of reaction to the concentration of a reactant. NOT true, many times the reaction is not based in the balanced reaction

The rate of a fast step has more effect on the overall reaction rate than the rate of a slow step. False, the slow step is the most important step when determining rates

Solid catalysts increase reaction rates as their surface areas increase. In general, this is true, more area, more sites, more reactions per unit time

Slow reactions can be speeded up by raising the temperature. In general, yes, since K will increase, but many times this is no always possible (degradation or other reactions may intervene)

Reactions involving very unstable combinations of chemicals have small rate constants. In general, this is true

Reaction rates always increase as masses of solid reactants increase. Not always, but if finely powedered, solids will increase its area, therefore more sites of reaction, therefore faster (less time)



queen_honey_blossom answered 3 months ago
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