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Chemical Equilibrium

Chemical Equilibrium

Assessment

Presentation

Science

11th Grade

Medium

NGSS
HS-PS1-5, HS-ESS3-1, K-ESS2-2

+14

Standards-aligned

Created by

Christiana Amadi

Used 7+ times

FREE Resource

11 Slides • 21 Questions

1

Le Chatlier's Principle

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2

Open Ended

When you hear this principle, what is the first thing that comes to mind? Don't google it! 😂

3

Le Chatelier's States...

when a chemical system is at equilibrium and is disturbed by a stress, the system will respond by attempting to counteract that stress until a new equilibrium is established.

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4

What factors affect the chemical equilibrium?

Concentration

Temperature

Pressure

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5

Concentration

If the concentration of one substance in a system is increased, the system will respond by favoring the reaction that consumes that substance.

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6

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7

Temperature

Endothermic and Exothermic

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8

Pressure

A change in the pressure on a liquid or a solid has a negligible effect.

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9

 Imagine the gases are contained in a closed system in which the volume of the system is controlled by an adjustable piston 

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10

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11

Multiple Choice

Question image

What happens to the equilibrium if we add methane (CH4)?

1

It shifts left, towards the reactants

2

It shifts right, towards the products

3

It does not shift

12

Multiple Choice

Question image

What happens to the equilibrium if we remove heat?

1

It shifts left, towards the reactants

2

It shifts right, towards the products

3

It does not shift

13

Multiple Choice

Question image

What happens to the equilibrium if we remove water (H2O)?

1

It shifts left, towards the reactants

2

It shifts right, towards the products

3

It does not shift

14

Multiple Choice

The three factors that affect the equilibrium of a reaction are temperature, pressure and __________. 
1
energy
2
concentration 
3
enthalpy 
4
ice 

15

Multiple Choice

For the reaction...
N2 (g) +  3 H2 (g) <−> 2 NH3 (g)

If the pressure in the system is increased, the reaction will __________________.
1
 shift to the left
2
shift to the right
3
not shift

16

Multiple Choice

For the reaction...
SO2(g) + O2(g) <−>  SO3(g)
If the concentration of 
SO2(g)  is increased, the equilibrium of the reaction will ___________.
1
shift to the left
2
shift to the right
3
not shift

17

Multiple Choice

An exothermic reaction is allowed to reach equilibrium. If heat energy is then removed, the equilibrium will shift
1
toward the middle
2
toward the reactant side
3
toward the product side

18

Multiple Choice

When writing an endothermic reaction, heat energy is stated as
1
product
2
catalyst
3
reactant

19

Multiple Choice

Le Chaltelier's Principle states that if a chemical system at equilibrium is stressed,
1
the system will adjust to increase the stress
2
the system will adjust to reduce the stress
3
the system will not adjust

20

3 Questions After the Video

​Fe3+ + SCN <--> FeSCN2+

  1. Increasing the SCN- concentration shifted the reaction to the right or left?

  2. Increasing the Fe3+ concentration shifted the reaction ot the right or left?

  3. Decreasing the Fe3+ concentration (by adding Na2HPO4 shifted the reaction right or left?

21

22

Open Ended

Question image
  1. Increasing the SCN- concentration shifted the reaction to the right or left? What's your evidence?

Fe+3 (aq) + SCN(aq) « FeSCN+2 (aq)

23

Open Ended

Question image
  1. Increasing the Fe+3 concentration shifted the reaction to the to the right or left? What's your evidence?

Fe+3 (aq) + SCN(aq) « FeSCN+2 (aq)

24

Open Ended

Question image
  1. Decreasing the Fe+3 concentration (by adding Na2HPO4) shifted the reaction to the right or left? What's your evidence?

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq)

25

Multiple Choice

Because the reaction Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) is exothermic, which formula would you use?

1

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

2

Fe+3 (aq) + SCN(aq) + Heat <--> FeSCN+2 (aq)

3

Fe+3 (aq) + SCN(aq) + Heat <--> FeSCN+2 (aq) + Heat

26

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Increasing the temperature of this reaction would shift the equilibrium...

1

Towards the products, forward reaction

2

Towards the reactants, reverse reaction

3

It wouldn't affect equilibrium

27

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Because the reactants are yellow, and the products are red. What would the test tube look like after DECREASING the temperature?

1

Yellow

2

Red

28

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Because the reactants are yellow, and the products are red. What would the test tube look like after INCREASING the temperature?

1

Yellow

2

Red

29

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Because the reactants are yellow, and the products are red. What would the test tube look like after increasing the concentration of FeSCN?

1

Yellow

2

Red

30

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Because the reactants are yellow, and the products are red. What would the test tube look like after increasing the concentration of Fe+3?

1

Yellow

2

Red

31

Multiple Choice

  1. Decreasing the pressure of the reaction will shift the equilibrium...

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq)

1

Right towards the products

2

Left towards the reactants

3

It won't affect equilibrium

32

Multiple Choice

Fe+3 (aq) + SCN(aq) <--> FeSCN+2 (aq) + Heat

Because the reactants are yellow, and the products are red. What would the test tube look like after Decreasing the concentration of SCN-?

1

Yellow

2

Red

Le Chatlier's Principle

Amadi, C

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