Equilibrium: How is your balance?
Physical Science December 12, 2011
Ms Cillipages 216-219
Physical Science pages 216-219
Physical Science pages 216-219
Objectives
Identify and describe physical and chemical equilibria.
Describe the factors affecting chemical equilibrium.
Physical Science pages 216-219
Ever rode a seesaw?
Physical Science pages 216-219
Equilibrium
A state in which the forward and reverse paths of a change take place at the same rate
What are the two types of changes?
1. 2.
REVERSIBLE REACTION
Physical Science pages 216-219
When physical change does not go to completion, a physical equilibrium is established
The forward and reverse changes are the same
Example: slushie
Physical Science pages 216-219
Physical Equilibrium
Physical Science pages 216-219
Physical Science pages 216-219
Chemical Equilibrium
Occurs when the reaction does not go to completion
Example:
All together now…
A physical
equilibrium is
established
between the
forward and reverse
reactions when the
physical change
does not go to
completion
A chemical
equilibrium is
established
between the
forward and reverse
reactions when the
chemical change
does not go to
completionPhysical Science pages 216-219
Physical Science pages 216-219
When a change is introduced into a
system in equilibrium, the
equilibrium shifts in the direction that
relieves the change
Henri Le Châtelier
1.
2.
3.
Physical Science pages 216-219
Factors that affect equilibrium:
If energy is added to one side, the other side will release it
Physical Science pages 216-219
Factors that affect equilibrium: Temperature
If the reaction is endothermic (adding heat), when the reaction is reversed the heat will be ________. (exothermic).
Physical Science pages 216-219
Factors that affect equilibrium: Temperature
What happens when you squeeze a balloon?
Physical Science pages 216-219
Factors that affect equilibrium: Pressure
If you increase the pressure on one side, it will shift direction to ________ the pressure
Physical Science pages 216-219
Factors that affect equilibrium: Pressure
What happens if you increase the amount of ingredients (reactants) when making a cake?
Physical Science pages 216-219
Factors that affect equilibrium:
Concentration
Physical Science pages 216-219
Factors that affect equilibrium:
Concentration
Physical Science pages 216-219
Closure True or false:
In chemical equilibrium, the rate of forward reaction does not equal the rate of the reverse reaction.
The three factors that affect chemical equilibrium are:
A. PressureB. TemperatureC. ConcentrationD. VolumeE. Only A, B, and C
Assignment: Independent Work:
Read section 7.5 in the book Start studying for the test Finish the study guide
Homework: Section 7.5 HW due Tuesday, December
13th by 8PM
Physical Science pages 216-219
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