Intro to Equilibrium

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Slide 1: Slide
ChemistrySecondary Education

This lesson contains 25 slides, with interactive quizzes and text slides.

Items in this lesson

Slide 1 - Slide

Self-check:
How do you feel today?
😒🙁😐🙂😃

Slide 2 - Poll

  • Dynamic equilibrium
  • Forward reaction
  • Backward reaction
  • Position of Equilibrium
FOCUS CONCEPTS
✍🏻

Slide 3 - Slide

Slide 4 - Slide

  • Why is a "closed system" needed in order to establish a dynamic equilibrium?
FOCUS QUESTION
?

Slide 5 - Slide

A dynamic equilibrium occurs when you have a ____________ reaction in a closed system.
A
reversible
B
irreversible
C
chemical
D
exothermic

Slide 6 - Quiz

Slide 7 - Slide

In your activity, the reaction is still continuing. For every red square that turns blue, somewhere in the mixture, it is replaced by a blue square turning orange. This is a _______ equilibrium.
A
reversible
B
dynamic
C
constant
D
null

Slide 8 - Quiz

What does the word "dynamic" in dynamic equilibrium mean?

Slide 9 - Open question

You can show dynamic equilibrium in an equation for a reaction by the use of ___________.
A
an equal sign
B
right arrow
C
left arrow
D
double arrow

Slide 10 - Quiz

  • Does this represent a reversible reaction?

Slide 11 - Slide

A reversible reaction in as state of dynamic equilibrium

Slide 12 - Slide

Which one is a forward reaction?
A
red to blue
B
blue to red

Slide 13 - Quiz

Which one is a forward reaction?
A
blue to red
B
red to blue

Slide 14 - Quiz

Slide 15 - Slide

Position of Equilibrium
In the example you've done, the equilibrium mixture contained more red squares than blue ones. Position of equilibrium is a way of expressing this. 

Slide 16 - Slide

Position of Equilibrium
"The position of equilibrium lies towards the red."

Slide 17 - Slide

Position of Equilibrium
"The position of equilibrium lies towards the red."
"The position of equilibrium lies towards the right-hand side."

Slide 18 - Slide

Position of Equilibrium
If the conditions of the experiment change (by altering the relative chances of the forward and back reactions happening), the composition of the equilibrium mixture will also change.

Slide 19 - Slide

Position of Equilibrium
For example, if changing the conditions produced more blue in the equilibrium mixture, you would say "The position of equilibrium has moved to the left" or "The position of equilibrium has moved towards the blue".


Slide 20 - Slide

Slide 21 - Slide

A dynamic equilibrium occurs when you have a reversible reaction in an open system. Nothing can be added to the system or taken away from it apart from energy.
TRUE
FALSE

Slide 22 - Poll

At equilibrium, the quantities of everything present in the mixture remain constant, although the reactions are still continuing. This is because the rates of the forward and the back reactions are equal.
TRUE
FALSE

Slide 23 - Poll

If you change the conditions in a way which changes the relative rates of the forward and back reactions, you will change the position of equilibrium - in other words, change the proportions of the various substances present in the equilibrium mixture.
TRUE
FALSE

Slide 24 - Poll

Self-evaluation:
Rate your participation and understanding of the lesson.
15

Slide 25 - Poll