Can anyone give a quick summary....

[rak173]

---

Members don't see this ad.

of what affects what in this list: Activation Energy, Catalysts, Temperature, Rate law, Rate constant.

This can be confusing since for example, the rate constant is only affected by temp and Ea (right?) and Ea is affected by catalysts only? Can anyone give a quick summary of what is affected by what from the list above?

Thanks.

 

[JLT223]

of what affects what in this list: Activation Energy, Catalysts, Temperature, Rate law, Rate constant.

This can be confusing since for example, the rate constant is only affected by temp and Ea (right?) and Ea is affected by catalysts only? Can anyone give a quick summary of what is affected by what from the list above?

Thanks.

The only thing that changes the rate constant is altering tempetature

 

[jz123]

Arrhenius Equation says that k=Ae^(-Ea/RT), so k is the rate constant, Ea is the activation energy and R is just a constant (value of 8.0 ish), T is temperature.
According to this equation, if Ea decrease, the the (Ea/RT) value would be lowered, since there is a negative sign in front of the (Ea/RT), the result of e^(-Ea/RT) would be larger, therefore k would be larger. Using the same approach for T would allow you to see the effect of T on k, try this out yourself and understand it.
It is known that Ea is lowered with the presence of a catalyst/enzyme in biological systems.

So basically, Ea goes down ---> k goes up, and vice versa
T goes up, k goes up and vice versa. ( you can also think about it this way, when you have a lot of energy (high temperature), the rate (k) would goes up and reaction becomes faster.