P- Rate Flashcards
1
Q
What is the unit for rate of reaction?
A
mol dm-3 s-1
(conc/ time)
2
Q
How to calculate rate of reaction from graph + why
A
- draw tangent from t=0
- when rate is fastest- all reactants present
usually
3
Q
Which reaction does the overall rate depend on?
A
the reaction that requires the longest time (slowest rate)
4
Q
What can we deduce about a species if it is not shown in the rate equation of a mechanism?
A
- involved after RDS (rate determining step)
- ∵ x affect rate
5
Q
What can we deduce about a species if it is shown in the rate equation of a mechanism?
A
- involved before/ during RDS
- affects rate
- includes catalysts
6
Q
What is a species’ order of reaction if it is used after the RDS?
A
0
7
Q
Arrhenius equation
A
k = A e ^ (-Ea/ RT)
k- rate constant
A- Arrhenius constant (given)
R- gas constant
T- temp in K
↑ Ea, ↓ k ; ↑ R/ T, ↑ k
8
Q
def of rate of reaction
A
change in conc of reactant/ product per unit time (s)
9
Q
A
