Reaction Mechanism, Intermediates, and Catalysts

The rate-determining step is

• step of reaction in reaction mechanism which has the fastest rate among the other step of reaction

• step of reaction in reaction mechanism which has the slowest rate among the other step of reaction

• step of reaction in reaction mechanism which isn't the proper step in reaction mechanism

• an unimportant step of reaction in reaction mechanism

Tags

NGSS.HS-PS1-5

Which one ARE TRUE about rate of reaction?

1.A reactant on chemical equation may have no effect on reaction rates

2.A substance that is not a reactant may involve in reaction and affect reaction rate

3.In reaction mechanism, the overall rate of reaction is assumed to depends on the slowest step of reaction

• 1, 2, and 3

• 1 and 2

• 2 and 3

• 1 and 3

Tags

NGSS.HS-PS1-5

Which one AREN'T TRUE about reaction mechanism?

1.It's used to deduce rate equation of a reaction without conducting experiment first

2.We can possibly predict the reaction mechanism of a reaction as long as it's consistent with rate equation of that reaction

3.Rate equation of reaction are derived first from reaction mechanism before experiment is performed

• 1, 2, and 3

• 1 and 2

• 1 and 3

• 2 and 3

Tags

NGSS.HS-PS1-7

substance or species that doesn't appear in chemical equation, but is proposed to form in some reaction step and then is consumed at another reaction step at reaction mechanism, is called

• product

• substrate

• catalyst

• intermediate

substance or species that doesn't appear in chemical equation but exist in reaction and involve in the rate of reaction by being consumed at early step of reaction before is finally formed again at the later step of reaction, is called

• Catalyst

• Substance

• Product

• Intermediate

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

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