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April 20, 2014

Homework Help: chemistry

Posted by Issac on Friday, February 9, 2007 at 7:09pm.

1. A three-step mechanism has been suggested for the formation of carbonyl chloride:


Step 1: Cl2 ===> 2 Cl (fast equlibrium)
Step 2: Cl + CO ===> COCl (fast equilibrium)
Step 3: COCl + Cl2 ===> COCl2 + Cl (slow)

What is the molecularity of the rate-determining step?

unimolecular
bimolecular
termolelcular
none of these

2. The elementary reaction representing the formation of ozone,

O2(g) + O(g) + M(g) ===> O3(g) + M*(g) is an example of a _________ reaction.

unimolecular
bimolecular
termolecular
tetramolecular

3.The elementary reaction, 2HI ===> H2 + I2, is an example of a ________ reaction.

unimoleculer
bimolecular
termolecular
tetramolecular
Answer Clarification:
1. tertmolecular
2. unimolecular
3. biomolecular



What is your opinion and why?

1. FOR THE FIRST ONE IT ENDS WITH MORE THAN TWO VARIABLE CONCENTRATIONS, SO IT CANCELS THE FIRST TWO.
2. THIS ONE THE REACTION CAN GO BACK AND FORTH, SINCE IS AT EQUILIBRIUM IT IS UNIMOLECULAR
3. THE REACTION CAN COLLIDE AND IS TWO VARIABLES OF CONCENTRATIONS, SO IT WOULD BE BIMOLECULAR.

1. A three-step mechanism has been suggested for the formation of carbonyl chloride:


Step 1: Cl2 ===> 2 Cl (fast equlibrium)
Step 2: Cl + CO ===> COCl (fast equilibrium)
Step 3: COCl + Cl2 ===> COCl2 + Cl (slow)

What is the molecularity of the rate-determining step?

The rate determing step is step 3. We have two particles colliding. Therefore, it is bimolecular.I don't make sense out of your answer for #1.
unimolecular
bimolecular
termolelcular
none of these

2. The elementary reaction representing the formation of ozone,

O2(g) + O(g) + M(g) ===> O3(g) + M*(g) is an example of a _________ reaction.

unimolecular
bimolecular
termolecular
tetramolecular
I don't know what M and M* are. As written the reaction doens't balance so I will leave this one. The DECOMPOSITION of ozone is a unimolecular reaction. This one, without the M and M* muddle, is a bimolecular because two particles (O2 and O) must come together. If the M and M* are catalysts, then bimolecular because two particles are reacting. If M, O2, and O must collide, then it is termolecular but termolecular reactions are extremely rare and most text say they are not "reasonable." However, as written, I don't know what it means.

3.The elementary reaction, 2HI ===> H2 + I2, is an example of a ________ reaction.

unimoleculer
bimolecular
termolecular
tetramolecular
Answer Clarification:
1. tertmolecular
2. unimolecular
3. biomolecular
I am confused about the "answer clarification" since it doesn't clarify anything. For example, there is biomolecular (is that bimolecular) and tertmolecular (is that termolcular) but those words were already written as possible answers???
Anyway, two molecules of HI must come together so this is bimolecular.

Check my thinking.

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