What is the relationship between pressure and temperature?

[nemolala]

Does decreasing volume(increased pressure) lead to increase in temp or the other way round or what?

and also, does changes in temp have the opposite effect on K? so increase temp= decrease K value....?

[homosapiens]

For endothermic reactions, the K value changes with the temperature; that is, when temp decreases, the K value decreases too. This is because if you decrease the temperature of an endothermic reaction, it will move backwards, so the K value decreases.

For exothermic reactions, the K value changes opposite to the temperature, so when temp decreases, K increases. When you decrease the temperature of an exothermic reaction, it'll move forwards to produce more heat, so the K value is larger.

Haven't seen a question about pressure change changing the temperature, I don't think it does, someone correct me if I'm wrong!

[nemolala]

See thats what i had always thought, that there is no relo with temp and pressure and i cant see how the are linked.

This is the question (rexn is exo)

A mixture of the above gases is at eqm.  the volume of reactor is suddenly halved. the temp of reactor will increase in response to the pressure change.

the reactants has 3 particles and products have only 1. So the pressure increase will lead to a net forward reaction right? but why would temperature increase?

[Panicmode]

PV=nRT

Therefore, volume and mole constant, P is directly proportional to Temperature. (As temperature increases so does pressure and vice versa)

What homosapiens said about endo and exothermic reactions is also true.

if deltaH > 0; increase temp = increase K value

if deltaH < 0; increase temp = decrease K value.

[nemolala]

lol thanks never thought of that