physical prompts for revision questions

What 4 things do you need for a chemical reaction to occur?

reactants, energy, collision, and bonds broken/formed

What is theoretical reaction rate equal to?

collision rate * fraction of molecules with enough energy to react

What’s the PV law?

P1V1 = P2V2. inverse relationship

What are the ideal gas assumptions?

no IMFS between the gas particles

volume occupied by particles is negligible

perfectly elastic collisions between particles and the container walls

How do you use the virial equation?

pVm = RT*Z, where Z = 1 + B/Vm + C/Vm² + etc.

write down the van der waal equation for pressure

done

what’s the momentum change for one molecule hitting the wall?

p = -2mv_x = momentum after - momentum before. 2mv_x of energy is transferred to the wall.

What’s the number of molecules per unit volume for an ideal gas?

n*NA (avogadro’s number)/V

What’s the number of collisions in a box for one molecule

|v_x delta t|*(Area)

what’s the number of total collisions

done

What happens to the pressure

What is the compression factor (in relation to ideal gases)?

real molar volume/ideal molar volume (22.4L) = PVm/RT

what does it mean when Z < 1?

attractive forces dominate

what does it mean when Z > 1?

repulsive forces dominate

What’s the VT law?

V1/T1 = V2/T2. proportional relationship