Question

If the decomposition reaction of 1.4 M initial hydrogen peroxide (H2O2) occurs so that after 3 minutes, 0.83 M is left, what is the rate of the reaction?

A. -0.0046 M/s
B. -0.012 M/s
C. -0.19 M/s
D. -0.0032 M/s

Answer 1

@rvc @sweetburger What do you guys think?

Answer 2

please stay with us @Vocaloid :)
vera you may know the formula for the following question

Answer 3

could you please write down the formula @vera_ewing

Answer 4

−Δ[Reactants]/ Δt or Δ[Products]/Δt

Answer 5

\(\Large\rm Rate = Change~in~concentration~per~time\)

Answer 6

- (1.4 - 0.83) / 3 * 60 - initial ( 0 ) = approximately = - 0.003166 =- 0.0032 M/S

Notice: In other example if there is coefficients with the reactants or products .. All these formulas are out.

Answer 7

@rvc, Change in concentration per time is average rate of reaction

Answer 8

So the answer is D?

Answer 9

I believe so.

Answer 10

yep
sorry for the mistake
thanks

Answer 11

Thank you! Who should I give the medal to?

Answer 12

No problem.

Answer 13

Give it to rvc

Answer 14

How about this one?

Answer 15

no give it to trojan

Answer 16

@sweetburger Help please! @rvc

Answer 17

do you know about the energy profile diagram?

Answer 18

Yes

Answer 19

the starting of the curve is about the energy of reactants
the middle part is the transition state
and the latter part is the energy of products

Answer 20

So the answer is B?

Answer 21

No

Answer 22

A?

Answer 23

what difference do you see?

Answer 24

i think its C since the values are different

Answer 25

Are you 100% sure it's C?

Answer 26

yes
according to me its C

Answer 27

Okay thanks! :)

Answer 28

:)

Answer 29

How about this one?

Answer 30

The question is asking about the least amount of time
Which is the smallest no from the four options?

Answer 31

C can't be correct??

Answer 32

Min is greater than sec
so you r right
what remains next?

Answer 33

I think the answer is A...do you agree?

Answer 34

Check out the unit

Answer 35

its in minutes

Answer 36

Ohh so it's not A or C right?

Answer 37

4.48 X 10^-5= 0.0000448 s^-1

Answer 38

So the answer is B?

Answer 39

yep