Question (1 Viewer)

[martin310015]

can someone help me with this dot point i don't really get it......thanx

explain why the rate of reaction is increased by higher temperatures

 

[*sarah*]

When temp is increased the kinetic energy of the reacting particles also increases. This means that more of those particles are able to overcome the activation energy - thus the rate of reaction increases

 

[Zarathustra]

If the reaction is exothermic, increasing temp. will eventually decrease the rate of reaction - e.g. the Haber process.

 

[Xayma]

No it will push the equilibrium towards the endothermic reaction and increase the rate of reaction.

 

[Zarathustra]

Isn't that effectively decreasing in the exo. direction?

 

[Xayma]

Yes but the rate of reaction speeds up, but it pushes the equilibrium to the left producing less.

 

[BlackJack]

Yep. in higher temperatures, the molecules move around faster (because they have more energy). Since reactions can only take place when the molecules of reactants come together, faster molecules will bump into each other more and increase the rate of reaction.

In exothermic process like Haber, the essential thing is that the molecules "like" to be on the left side, and although heating will increase the speed ammonia is produced, the same heat will force more of the molecules, at equilibrium, to stay as nitrogen and hydrogen. So you get less.