Chemical Kinetics

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

Tags

NGSS.HS-PS1-5

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

Tags

NGSS.HS-PS1-5

Which of the following statements about the catalyst is true?

• A catalyst accelerates the rate of reaction by bringing down the activation energy.

• A catalyst does not participate in reaction mechanism.

• A catalyst makes the reaction feasible by making ∆G more negative.

• A catalyst makes equilibrium constant more favorable for forward reaction.

The half life of the first order reaction having rate constant K = 1.7 x 10-5s-1 is

• 12.1 h

• 9.7 h

• 11.3 h

• 1.8 h

Tags

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.

Tags

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

Tags

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]

Tags

NGSS.HS-PS1-5

• 0 order reaction

• 1st order reaction

• 2nd order reaction

• 3rd order reaction

Tags

NGSS.HS-PS1-5

What are the two factors to look for when determining if the reaction is at equilibrium?

• Forward reaction rate is faster than the reverse and concentrations are equal

• Forward and reverse reaction rates are equal and concentration is constant

• Forward and revers reaction rates are equal and concentration is equal

• Forward reaction rate is faster than the reverse and concentration is equal

Tags

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 

Tags

NGSS.HS-PS1-6