Kc and equilibria

Question 1

equilibrium

Answer 1

state of balance between opposing forces or actions

Question 2

establishing equilibrium

Answer 2

-only reactants first
-rate of forward dec. as reactants used up
-products made as time goes by
-rate of backwards inc. as products made
-forward + backward rates are equal
-dynamic equilibrium

Question 3

dynamic equilibrium

Answer 3

• only in closed system
• forward + backwards at equal rates
• conc. of products + reactants equal

Question 4

Le chatelier’s principle

Answer 4

position of equilibrium will shift to oppose a change made to it

Question 5

Changes in conc.

Answer 5

• if increased, shift to opposite direction
• if decreased, shift in that direction

Question 6

changes in pressure

Answer 6

• if increased, shift side with less moles
• if decreased, shift side with more moles
• pressure=volume

Question 7

exothermic

Answer 7

-energy released
-temp of surroundings increase
-enthalpy is negative

Question 8

endothermic

Answer 8

-absorb energy
-temp of surroundings decrease
-enthalpy change is positive

Question 9

changes in temperature

Answer 9

-if increased, shift in endothermic direction
-if decreased, shift in exothermic direction

Question 10

catalyst definition

Answer 10

speeds up rate of reaction by providing an alternative pathway with lower activation energy

Question 11

compromised conditions for the haber process

Answer 11

200 atm
450 degrees celsius
catalyst

Question 12

Kc definition

Answer 12

numerical value indicating the position of equilibrium

Question 13

Kc >1

Answer 13

more products than reactants
eq. shifts to right

Question 14

Kc < 1

Answer 14

more reactants than products
eq. shifts to the left

Question 15

Kc=1

Answer 15

dynamic equilbrium

Question 16

when to use ice box

Answer 16

given initial mol and 1 equil. conc

Question 17

when to use x box

Answer 17

given initial mol and Kc value