Iconic_panda
Badges: 10
Rep:
?
#1
Report Thread starter 3 years ago
#1
if something is in rate equation does it have to be in overall equation too?
0
reply
Kian Stevens
Badges: 16
Rep:
?
#2
Report 3 years ago
#2
(Original post by Iconic_panda)
if something is in rate equation does it have to be in overall equation too?
Yes - the reactants in the rate equation will be in the rate determining step.
0
reply
srinivasanchemi
Badges: 0
Rep:
?
#3
Report 3 years ago
#3
Rate equation or rate law is the expression indicating the relationship between rate of reaction and concentration of reactants. It will be something like Rate = k[H2]^2[O2]But overall equation is the chemical equation representing the reaction. It will be something like2H2 O2 --> 2H2OBoth will be different
0
reply
Kian Stevens
Badges: 16
Rep:
?
#4
Report 3 years ago
#4
(Original post by srinivasanchemi)
Rate equation or rate law is the expression indicating the relationship between rate of reaction and concentration of reactants. It will be something like Rate = k[H2]^2[O2]But overall equation is the chemical equation representing the reaction. It will be something like2H2 O2 --> 2H2OBoth will be different
Both don't have to be different, sometimes the rate equation can be the same as the overall equation; the example you gave is an example of this.

The rate equation you gave shows 2 molecules of H2 reacting with one molecule of O2 - this matches the overall equation's stoichiometry. This will imply that the entire reaction is the rate determining step.
0
reply
Iconic_panda
Badges: 10
Rep:
?
#5
Report Thread starter 3 years ago
#5
the specie in rate equation doesn't have to be in overall equation, just saying
0
reply
levi ackerman
Badges: 10
Rep:
?
#6
Report 3 years ago
#6
(Original post by Iconic_panda)
if something is in rate equation does it have to be in overall equation too?
not necessarily i think?? e.g. if the reaction involves a catalyst, the catalyst can (will?) appear in the rate equation (since a catalyst affects the rate of reaction), but the catalyst won't appear in the overall equation

have a look at question 5c in this pack of exam qs

http://pmt.physicsandmathstutor.com/...0%8B3%20QP.pdf

5c) How can you tell that H+ acts as a catalyst in this reaction?

the answer is

"Appears in rate equation (1)

does not appear in (stoichiometric / overall) equation (1) "

hope this helps
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Poll: What factors affect your mental health most right now? Post-lockdown edition

Anxiousness about restrictions easing (54)
6.07%
Uncertainty around my education (101)
11.35%
Uncertainty around my future career prospects (94)
10.56%
Lack of purpose or motivation (110)
12.36%
Lack of support system (eg. teachers, counsellors, delays in care) (44)
4.94%
Impact lockdown had on physical health (48)
5.39%
Social worries (incl. loneliness/making friends) (99)
11.12%
Financial worries (60)
6.74%
Concern about myself or my loves ones getting/having been ill (40)
4.49%
Exposure to negative news/social media (56)
6.29%
Difficulty accessing real life entertainment (26)
2.92%
Lack of confidence in making big life decisions (86)
9.66%
Worry about missed opportunities during the pandemic (72)
8.09%

Watched Threads

View All