Kinetics 2

Order of a reaction does not give any information about the reaction mechanism.

• True

• False

For the reaction: rate = k[C]²

Determine the time taken for the reaction become 50% from its initial concentration if [D]_o is 1.5 M and k is 1.2 x 10^-2 M^-1min^-1.

• 55.5 min

• 57.7 min

• 41.67 min

• 0.93 min

A straight line graph obtained when we plot a graph of ln [reactant] vs time. The order of reaction is ________

• zeto order

• First order

• Second order

• Third order

Which rate law represent the above rate constant?

k= 2.6 X 10^-2 M^-2s^-1.

• rate = k [A][B]

• rate = k [A][B]²

• rate = k [A]²[B]²

• rate = k [A]²[B]^o

In the chemical reaction, the successful formation of products depends on the following factors EXCEPT:

• The collisions between reacting molecules must be effective

• The colliding molecules must approach each other in the right orientation

• The energy of colliding molecules must be equal to or more than activation energy

• A collision between molecules must produce sufficient energy to overcome the activation energy

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

What is the catalyst in the following rate mechanism?

• HBr
• H₂O
• There is no catalyst

How many intermediates are in the following rate mechanism?

• 0
• 1
• 2
• 3

Which is the rate determining step?

• 1
• 2
• 3

If there is only single substance (atom, molecule, or ion) involved in the rate-determining step, that reaction is said to be

• unimolecular

• bimolecular

• polimolecular

• trimolecular