Chemical Kinetics

The overall rate of a reaction is governed by

• the rate of fastest intermediate step

• the sum total of the rates of all intermediate steps

• the average of the rates of all the intermediate steps

• the rate of slowest intermediate step

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NGSS.HS-PS1-5

1. What will be the fraction of molecules having energy equal to or greater than activation energy, Ea?

• K

• A

• Ae-Ea/Rt

• e-Ea/Rt

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NGSS.HS-PS1-5

What type of reaction is this?

• Second order

• Unimolecular

• Pseudo-unimolecular

• Third order

Which among the following is a false statement?

• Rate of zero order reaction is independent of initial concentration of reactant.

• Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant.

• Molecularity of a reaction may be zero or fraction.

• For a first order reaction, t1/2=0.693K

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NGSS.HS-PS1-5

The rate law of any chemical reaction 

• must be determined experimentally

• can be deduced based on the stoichiometry of the reaction

• changes based on the condition of the experiment

• I don't know

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NGSS.HS-PS1-5

According to the results of Experiment 1, for any given catalyst, as the temperature was increased, the number of cycles needed to complete the reaction:

• increased only.

• decreased only.

• increased, then decreased.

• decreased, then increased.

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NGSS.HS-PS1-5

• 0 order reaction

• 1st order reaction

• 2nd order reaction

• 3rd order reaction

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NGSS.HS-PS1-5

A possible rate law for a third overall order of a reaction is __________________

• Rate = k [A]²[B]²

• Rate = k [A][B]³

• Rate = k [A]³ [B]

• Rate = k [A]²[B]

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NGSS.HS-PS1-5

Imagine Jackson is conducting a chemical experiment in his lab. He decides to increase the concentration of a reactant. What happens to the equilibrium position of the reaction?

• It shifts towards the products.

• It shifts towards the reactants.

• It remains unchanged.

• The reaction stops.

Answer explanation

When the concentration of a reactant is increased, the equilibrium position shifts towards the products, according to Le Chatelier's Principle.

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NGSS.HS-PS1-5

NGSS.HS-PS1-6

A catalyst  

• is added to a reaction to make it slow down 

• breaks apart and is changed 

• provides an energetic short cut to the products 

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NGSS.HS-PS1-6

NGSS.HS-PS1-4