How can activation energy affect the rate of a chemical reaction?

  • Thread starter Thread starter joejo
  • Start date Start date
  • Tags Tags
    Chem
Click For Summary

Homework Help Overview

The discussion revolves around the concept of activation energy and its effect on the rate of chemical reactions, as well as the differences between geometric isomers in alkenes and alkanes.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore various methods to increase the rate of chemical reactions, including temperature, concentration, surface area, and the use of catalysts. Questions arise regarding the completeness of these methods and the role of activation energy.

Discussion Status

Some participants have provided insights into the relationship between activation energy and reaction rates, with a focus on how catalysts may lower activation energy. There is an ongoing exploration of additional methods to increase reaction rates, and participants are questioning and clarifying their understanding of these concepts.

Contextual Notes

Participants express uncertainty about the definitions and implications of catalysts and activation energy, indicating a need for further clarification on these topics.

joejo
Messages
150
Reaction score
0
Why do geometric isomers only exist in the alkene family but not in alkanes?

What are different ways of increasing the rate of a chemical reaction?
 
Physics news on Phys.org
the double bond in the alkene alows for roation. Due to the rigidity of the double bond, molecules direclty in contact with the bond have a very hard time moving but the two free bonds on each molecule ( asuming its a two carbon chain) are albe to roate freely.

This condition is know as Cis and Trans isomerisim.

Also with more complex alkene there is more double bonds. Also the more complex the alkene, the more side chains it may have. Thus with a large amount of side chains, the chain itself can attach to either the Cis or Trans side of the double bond and thus producing a different molecule.

The alkanes on the other hand have no double bonds and no matter how you look at them , two molecules with the same chemical formula can not be rearranged differently


As for increasing the rate of chemical reaction you must:

  • increase surface area
  • increase concentrations
  • increase temperature
 
Last edited:
thx that clears things up a bit...As for increasing the rate of chemical reaction are there any more ways or just those...
 
i think catalyst will increse the rate of rxn?? pls check
 
neone else?
 
joejo said:
thx that clears things up a bit...As for increasing the rate of chemical reaction are there any more ways or just those...

Temperature and in some cases, the concentration of the reactants, depending on the order of the reaction (if you are unsure of what I'm talking about, just ignore it).

[edit]
sorry, i didn't read your whole post. And i don't think catalysts speed up the reaction, they simply allow it to occur at a lower energy state by lowering the activation energy.
 
WhirlwindMonk said:
Temperature and in some cases, the concentration of the reactants, depending on the order of the reaction (if you are unsure of what I'm talking about, just ignore it).

[edit]
sorry, i didn't read your whole post. And i don't think catalysts speed up the reaction, they simply allow it to occur at a lower energy state by lowering the activation energy.

Lowering the activation energy is speeding up the reaction. Think of it in terms of a linear distance. If I am 5 miles from a store one day and 3 miles the next day, when will I get there faster?
 
bross7 said:
Lowering the activation energy is speeding up the reaction. Think of it in terms of a linear distance. If I am 5 miles from a store one day and 3 miles the next day, when will I get there faster?

That's right. It's just all those rules I have crammed into my head tend to get mixed up, especially when its almost 1 in the morning.
 

Similar threads

  • · Replies 14 ·
Replies
14
Views
6K
Replies
8
Views
2K
Replies
9
Views
31K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 10 ·
Replies
10
Views
2K
Replies
2
Views
1K
  • · Replies 16 ·
Replies
16
Views
4K
  • · Replies 28 ·
Replies
28
Views
6K
  • · Replies 10 ·
Replies
10
Views
3K
Replies
17
Views
4K