Reaction Mechanisms

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

Tags

NGSS.HS-PS1-5

How many elementary steps are in the following reaction

• 1
• 2
• 3

Which is the rate determining step?

• 1
• 2
• 3

Tags

NGSS.HS-PS1-5

Which of the elementary steps  has the highest activation energy?

• slow
• fast

Which step does a catalyst affect?

• slow 
• fast

Tags

NGSS.HS-PS1-5

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

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

• unimolecular

• bimolecular

• trimolecular

• polimolecular

Reaction :

2A + B → C + D

is proposed to have reaction mechanism shown below :

A + B → AB + D (slow)

A + AB → C (fast)

the consistent rate equation with the reaction mechanism above is ____

• rate = k [A]² [B]

• rate = k [A]² [B]²

• rate = k [A] [B]

• rate = k [A] [B]²

Tags

NGSS.HS-PS1-5

The decomposition of nitrous oxide :

2N₂O(g) → 2N₂(g) + O₂(g)

is believed to occur by two-step mechanism

N₂O(g) → N₂(g) + O(g) (slow)

N₂O(g) + O(g) → N₂(g) + O₂(g) (fast)

the consistent rate equation based on the mechanism above is ____

• rate = k [N₂O]²

• rate = k [N₂O]

• rate = k [N₂O]² [N₂]

• rate = k

Tags

NGSS.HS-PS1-5