11A.4 Flashcards
in order for a reaction to take place the atoms must collide…
- in the right orientation
2. with sufficient energy
what is an elementary reaction
a single collision between two reactant particles
what are intermediates
they are species (compounds etc) that dont appear in the final overall equation but are involved in reactions that ultimately result in the reactants being converted into products
what does the order of the reactant and the reactant tell us but the mechanism of the reaction?
the order indicates the number of molecules involved in the rate-determining step
the reactant indicates that only its are involved in the rate-determining step
what is an SN1 reaction
it is substitution Necloephilic unimolecular and it means there is only one reactant particle present in the rate equation and it has intermediates form
what is an SN2 reaction
it is Subsition Nucleophilic bimolecular and it means there are two reactant particles and it has no intermediate but rather a transition state
how do you draw a transition state
page 17
what is the limitation with finding out the rate of iodine-propanone reaction by a titrimetric reaction
the time delay from withdrawing samples by a pipette and quenching in with sodium hydrogen carbonate
what are the ways we can confirm or deny the proposed mechanism of Iodination of propanone
- use a wider range of concentrations: at very low concentrations of Iodine the order of the reaction in respect to iodine in the final step will become one
- use instrumental methods: use nuclear magnetic resonance to find acidified propanone which is one of the intermediates
3, carry out the reaction with deuterated propanone since the C- D bond is stronger than C - H, and the C- H bond breaks in the rate-determining step so if the reaction is overall slower then it confirms the mechanism
what is the mechanism of Iodination of propanone
page 18
what is the mechanism of the deoxygenation of NO2
page 16
