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

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

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

A possible mechanism for reaction :

A + 2B → C + D

is shown below :

2B → E (slow)

A + E → C + D (fast)

which of the following diagram represents reaction pathway diagram for this reaction mechanism?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-4

the reaction between gaseous iodine monochloride, ICl, and gaseous hydrogen :

H₂(g) + 2ICl (g) → I₂(g) + 2HCl (g)

has a rate equation : k [ICl] [H₂]

Which one ARE TRUE based on information above?

• unimolecular reaction probably take places in rate-determining step

• H₂ molecules only involve in fast step reaction

• It's likely that only 1 molecules of ICl involve in rate-determining step

• The reaction doesn't depends on the concentration of H₂

Tags

NGSS.HS-PS1-5