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### The rate of a reaction

Posted: Fri Feb 23, 2018 3:36 pm
Do other things play a role in how fast a reaction takes place or is it all dependent on kinetics?

### Re: The rate of a reaction

Posted: Fri Feb 23, 2018 5:09 pm
Yes, rates of reactions is all dependent on kinetics, which includes the nature of the reactants, the temperature, the presence of a catalyst, and concentration. Thermodynamics is what we use to see whether or not reactions are favorable, not their speed.

### Re: The rate of a reaction

Posted: Fri Feb 23, 2018 6:49 pm
in general, remember that the rate constant k is dependent on temperature and the activation energy of the reaction.

### Re: The rate of a reaction

Posted: Sun Feb 25, 2018 8:46 pm
kaushalrao2H wrote:in general, remember that the rate constant k is dependent on temperature and the activation energy of the reaction.

Can someone please explain why that is?

### Re: The rate of a reaction

Posted: Sun Feb 25, 2018 8:54 pm
K is dependent on temperature because the molecules in the substances in the given reactions will change due to the change in temperature. A higher temperature will cause molecules to vibrate more and move more rapidly, which could then increase or decrease the rate of the reaction, thus the value of K, depending if the reaction is endothermic or exothermic.
This kind of explains why activation energy is also important in determining K. The molecules need to possess a certain amount of energy (activation energy) in order to collide with each other to cause a reaction to occur.

### Re: The rate of a reaction

Posted: Sun Feb 25, 2018 11:36 pm
Yes! I think in class, it is put as rate of constant k depends of temperature and activation energy.