Quiz 3

Question 1

Reaction Quotent: Keq

Answer 1

when the reaction is at equilibrium

Question 2

Reaction Quotent: Q

Answer 2

when reaction is not at equilibrium

Question 3

Keq=

Answer 3

Products/Reactants

Question 4

if k &laquo_space;1

Answer 4

reactants will be favored

Question 5

if k»1

Answer 5

products are favored

Question 6

if Q>Keq then

Answer 6

the reaction will go twards the reactants to achieve equilibrium

Question 7

if Q<Keq then

Answer 7

the reaction will go twards the products to achieve equilibrium

Question 8

Kfoward=

Answer 8

1/Kreverse

Question 9

Don’t include pure solids or liquids in

Answer 9

• the calculation for Q or Keq
• Calculating Δn

Question 10

Ways to aviod using the quadratic formula

Answer 10

• if k is small then you can assume x is small
• take a square root on both sides if there is a perfect square
• if k is large then assume the reaction goes all the way to products then back to reactants a little bit and assume k is small
• Successive approximation: assume x is smal, with the approximated x put it back into the equation and solve again

Question 11

Reaction Quotent: Ksp

Answer 11

solubility products: tells you how soluble something is
* does not have a denominator

Question 12

Ksp large

Answer 12

more soluble

Question 13

Ksp small

Answer 13

less soluble

Question 14

Kp=Kc(RT)^Δn

Answer 14

Kp= pressure
Kc= consentration
R=0.0806
T= tempertuare in kelvin
Δn= coefficent of products- coefficent of reactants

Question 15

Le chatelier’s principle

Answer 15

the system trys to undo what was done to it
* There will be no change in the equilibrium if there is the same # of molecues on both sides

Question 16

Endothermic reaction

Answer 16

• heat is absorbed
• ΔH>0
• Heat + A -> B
• Raise the temp = reaction goes twards products
• lower the temp = reaction goes twards reactants

Question 17

Exothermic Reaction

Answer 17

• Heat is prododuced
• ΔH<0
• A -> B+Heat
• Raise the temp = reaction goes twards reactants
• Lower the temp = reaction goes twards products

Question 18

Molar solubility

Answer 18

How many grams dissolve in a ceritan amount
* commonly 1L or 100mL

Question 19

common ion effect

Answer 19

the shift in the position of an equilibrium casued by the addition of an ion taking part in the reaction

Question 20

Ksp>Q

Answer 20

No precipitate will form reaction will go to products to reach equilibrium

Question 21

Ksp<Q

Answer 21

Precipitate will form, reaction will go towards reactants to reach equilibrium