IT+Home+Learning+-+Reversible+Reactions

=Lesson Plan=
 * Subject** : Chemistry
 * Topic** : Reversible Reactions

At the end of the lesson, students should be able to: a. describe the idea that some chemical reactions can be reversed by changing the reaction conditions b. state the idea that some reversible chemical reactions reach a state of dynamic equilibrium c. state Le Chatelier’s Principle and use this to predict the effect of changing the conditions of a reversible reaction at equilibrium
 * Specific Instructional Objectives**:

Before this lesson, students should be able to: a. write simple chemical equations b. understand the law of conservation of mass in a chemical reaction Understand Le Chatelier's Principle a. effect of concentration b. effect of temperature c. effect of pressure d. effect of temperature on a reversible reaction. ||
 * Prior Knowledge required**:
 * Time Frame || Lesson Activities ||
 * 60 mins || Introduction


 * Evaluation:** You are required to do the online quiz.Pls type in your name and class.
 * Discussion forum:** Go to the discussion forum to join in the discussion or post any comments or queries.

=**Introduction**=

Pls read thru this ppt slide for an introduction to this topic.




 * LE CHATELIER’S PRINCIPLE **

The principle of Le Chatelier describes the effect of external factors on equilibrium mixtures, stating that ‘if a system at equilibrium is subjected to a constraint, then the equilibrium will tend to alter in such a way, as to annul the effect of the constraint’. These ‘constraints’ can be changes of **concentration**, **pressure**, or **temperature**

Pls watch these series of videos to understand the application of Le Chatelier's Principle to reversible reactions.

Part I: [] Part II: [] Part III: [] Part IV: []

//Effect of concentration://
media type="file" key="concentration.flv" width="360" height="270"

Increasing thiocyanate ions- media type="file" key="concentration - left.flv" width="360" height="270"

Decreasing Fe(II) ions- media type="file" key="concentration - right.flv" width="360" height="270"

//**Effect of pressure:**//
media type="file" key="pressure.flv" width="360" height="270"

Increasing pressure- media type="file" key="pressure - left.flv" width="360" height="270"

Decreasing pressure- media type="file" key="pressure - right.flv" width="360" height="270"

media type="file" key="temperature.flv" width="360" height="270"

Decreasing temperature- media type="file" key="temperature - left.flv" width="360" height="270"

Increasing temperature- media type="file" key="temperature - right.flv" width="360" height="270"

//**Discussion:**//

a) Check out this link to watch an interesting video about stresses on an equilibrium. media type="youtube" key="dmOif5MUPcE" height="270" width="331"

b) Check out this link on effect of temperature of an equilibrium:

media type="youtube" key="tlGrBcgANSY" height="273" width="335" Then answer the discussion questions posed in the discussion forum (just choose 1). You can also post comments on other students' replies, to add on to what they have shared.

//**Self-test Quiz:**//

Pls attempt this quiz at the page titled "Online quiz - Reversible reactions"