Rate equations Flashcards

1
Q

For the following reaction aA + bB -> products what is the generalised rate equation

A

r = k[A]m[B]n

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

rate units

A

moldm-3 s-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What do square brackets symbolise?

A

concentration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what is k called?

A

the rate constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In the rate equation r = k[A]m[B]n , what are the m and n called?

A

reaction orders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Total orders=

A

adding all individual orders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Zero order A means it has what effect on the rate of reaction?

A

r= k[A]0
no effect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

First order A means it has what effect on the rate of reaction?

A

r = k[A]1
directly proportional to concentration of A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Second order A means it has what effect on the rate of reaction?

A

r = k[A]2

proportional to concentration of A^2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

1st order overall reaction k units?

A

s-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

2nd order overall reaction k units?

A

mol-1 dm3 s-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

3rd order overall reaction k units?

A

mol-2dm6s-1

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

k’s value is independent of

A

concentration and time
constant at a fixed temperature (if temp increases, k increases)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

how to calculate k?

A

rearrange rate equation for k as a subject

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

indices in rate equations are not …

A

stoichiometric values

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Initial rate on a concentration vs time graph?

A

gradient at 0

17
Q

Different volumes of the same initial concentrations will have the _____ initial rate if other conditions are the same but _____

A

the same

will end at different amounts

18
Q

Make the rate equation rate = k[y]n into a y = mx+ c equation

A

log both sides of the eqn
lograte = logk + nlog[Y]
y = c + mx

19
Q

Deducing rate equation from experiment data

A

compare between reactions where a reactant conc hasn’t changed
use this value if the others all change after

20
Q

Arrhenius equation

A

k = Ae^–Ea/RT

21
Q

lnk (arrhenius equation) =
y = mx + c components:

A

-Ea/RT + ln A

gradient = 1/T
m = -Ea/R (/1000 for Ea)
c = ln A