(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.

Reaction rate constants increase with increasing temperature.

Solid catalysts increase reaction rates as their surface areas increase.

The rate of a reaction is the same as the rate constant of the reaction.

The slowest step in a reaction is called the rate-determining step.

Reaction rates increase with increasing temperature.

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

Solutions

Expert Solution

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

Reaction rate constants increase with increasing temperature: true (because collision between the reactant particles increase)

Solid catalysts increase reaction rates as their surface areas increase: false (catalyst do not affect the reaction rates, it only changes the amount of activation energy)

The rate of a reaction is the same as the rate constant of the reaction: false (A--> B; rate = rate constant*Bⁿ ; n= order of the reaction)

The slowest step in a reaction is called the rate-determining step: true

Reaction rates increase with increasing temperature: true

The rate of a slow step has more effect on the overall reaction rate than the rate of a fast step: True [The slowest step of a chemical reaction determines the rate at which the overall reaction proceeds. There are examples where a reactant that appears in a fast step does not appear in the rate equation. Reactants in the slow step appears in the rate equation

2H₂ + 2NO --> N₂ + 2H₂O

r = k[H₂][NO]²

1. 2NO <--> N₂O₂ (fast)

2. N₂O₂ + H₂ --> N₂O + H₂O (slow)

3. N₂O + H₂ --> N₂ + H₂O (fast)

The second molecule of H₂ does not appear in the rate equation because it reacts in the third step, which is a rapid step after the rate-determining step, so that it does not affect the overall reaction rate.]

queen_honey_blossom answered 1 year ago

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