5) (5 pts) Given the reaction energy diagram to the right,...

5) (5 pts) Given the reaction energy diagram to the right, label the location of the reactants, products, transition state, activation energy, and enthalpy change. Does this diagram show an endothermic or exothermic reaction? Using a dotted line, show how the diagram would change if a catalyst is added. 6) (6 pts) Calculate the activation energy, in kJ/mol, for a given reaction if the rate constant increases from 2.50 s?¹ at a temperature of 22.0°C to 12.5 s?¹ at a temperature of 35.0°C.

Transcript

00:01 Reaction energy diagram to the board, label the location of a reactant product, transition state, activation energy, and entropy change.

00:13 So in the beginning, then here we have the reactant.

00:23 So the reactants have higher energy level.

00:27 And then you can see there is a peak.

00:31 The peak is when we called the transition state.

00:52 So this is the energy barrier, the reactant must overcome before it can have the reaction downhill to become the product.

01:04 So you can see that on the right side you have the products.

01:08 The energy level is lower than reactants.

01:14 Then if you look at the distance between the reactant and the transition state, the distance right here is called activation energy.

01:35 So reactant must absorb energy from the surroundings, such as like a higher temperature or sometimes mixing would actually increase the collision of these molecules.

01:48 But anyway, so all these energy will have to be absorbed from the surroundings.

01:55 So then the reactant will actually accumulate enough activation energy to enrich.

02:00 The transition states.

02:02 Once the transition state is reached and it can go downhill to form the product.

02:07 So basically, the activation energy is what we call the rate limiting step.

02:14 And also, the question asks you to label the enthalpy change.

02:20 The enthalpy change is a distance between the reactant and the product.

02:26 So this is product energy.

02:28 Delta h is in between.

02:31 So this is the difference between the region.

02:33 Reactant and the product.

02:37 Now the second question says that does this diagram show the endothermic or axothermic reaction? axothermic means energy is being released.

02:53 So since the reactant energy is higher than the product, this is an axothermic.

03:11 Releas thermic release.

03:15 Energy and use a dotted line show how diagram would change if the catalyst is added.

03:21 When a catalyst such as enzyme is being added, it lowered activation energy.

03:27 So it will start out with the same like this, but the activation energy is a lot lower, and then it goes down like this.

03:37 So you can see that the reactant energy and product energy are the same, but the activation energy is much lower.

03:48 This is the new activation energy.

03:50 So this means that the enzyme somehow, or catalyst, not necessarily enzyme, is actually maybe ban the bond in a certain angle so that it makes it easier to access.

04:04 So it lowered the activation energy.

04:11 A lot of time, the catalyst band the bond of the reactant to achieve this.

04:19 So the catalysts lower activation energy.

04:32 So you can see the peak is a lot lower...

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