Chemical Kinetics, EQ, and Thermochemistry

30 cards

General Chemi stry Cha


 
  
Created Jun 1, 2010
by
liliett89

 

 
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1
Name all the reaction orders
 

Zero order

First order

Second order

Higher order

Mixed order

2
M
 

Molarity

mol solute/L of solution

3
Zero-Order reactions
 

has a constant rate, independent of the reactants concentration.

r = k

4
What are the units of k?
 
Msec-1
5
Radioactive decay
 

[At] = [Ao] e-kt

[Ao] is the initial concentration...

6
products < reactants
 

exothermic (-)

 

7
products > reactants
 
endothermic (+)
8
What are the factors affecting reaction rate?
 

reactant concentration

temperature

medium

catalyst

9
Equilibrium Expression
 
Products / Reactants
10
What type of states don't appear in the equilibrium constant?
 
liquids and solids
11
Le Chatelier's principle
 
A system to which stress is applied tends to change to relieve the applied stress.
12

A + B ---> C + D

         <----

If...

 
Then the equilibrium will switch to the right
13
Change in pressure and volume
 
Inverse to one another. If pressure increases, volume will decrease. If pressure or volume...
14
Change in Temperature
 

In an exothermic reaction:

If the temperature increases the EQ will go to the left....

15
Equation to determine the decay constant
 
t1/2 = 0.693 / k
16
What types of systems exist
 

isolate, closed, and open

isolated- neither energy or matter can be exchanged

closed-...

17
isothermal
 
occurs when the temperature of the system remains constant
18
adiabatic
 
occurs when no heat exchange occurs
19
isobaric
 
when the pressure of the system remains constant
20
Heat is measured in?
 
calories (cal) or Joules (J)
21
Measuring calorimetry or heat changes
 
q = mc(delta)T
22
Enthalpy
 
delta H = H of products - H of reactants
23
Hess's Law
 
States that enthalpies of reactions are additive.
24
Entropy is the measure of?
 
Disorder or randomness. The greater the entropy the more disorder.
25
What's the second law of thermodynamics
 
all spontaneous process proceed such that the entropy of the system plus its surrounding increases
26
Gibbs Free Energy equation
 
deltaG = deltaH - TdeltaS
27
If delta G is negative
 
the reaction is spontaneous
28

delta H       delta S

-                   +

+                 ...

 

 

spontaneous all the time

nonspontaneous all the time

spontaneous...

29
ΔG₀
 
ΔG₀ = - R·T·ln(Keq)
30
ΔG
 
ΔG₀ + R·T·ln Q 

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