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Flashcards in Chemical equilibrium Deck (10)
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1
Q

What is the partial pressure

A

The pressure that the gas would exert on its own under the same conditions

2
Q

What expression is used to calculate the partial pressure

A
Pa = xapt
Pa = partial pressure
xa = the mole of a 
Pt = total pressure
3
Q

What’s the general formulae for calculating Kc

A

Kc = [C]y [D]z
————–
[A]w [B]x
wA + xB —->yC +zD

4
Q

What are the 5 steps for working out Kc

A

1) Write the expression for Kc
2) Total the power for the top concentration
3) Total the power for the bottom concentration
4) work out (answer 2) - (answer 3)
5) Apply answer 4 to the concentration units, moldm-3

5
Q

What’s the general equation for Kp

A

Kp = (pC)y (pD)z
——————–
(pA)w (pB)x
wA + xB —->yC +zD

6
Q

What are the 5 steps for working out Kp

A

1) Write the expression for Kp
2) Total the powers for the top partial pressure
3) Total the power for the bottom partial pressure
4) Work out (answer 2) - (answer 3)
5) Apply answer 4 to the pressure units, atm

7
Q

What happens to Kc/Kp when the reversible reaction is exothermic in the forward direction

A

Kc or Kp decreases with increasing temperature

8
Q

What happens to Kc/Kp when the reversible reaction is endothermic in the forward direction

A

Kc or Kp increases with increasing temperature

9
Q

What effect does concentration have on Kc o

A

Has no effect

10
Q

What effect does adding a catalyst have on the Kc/Kp value

A

No effect on the value