Lesson Plan: Chemical Laws and Stoichiometry

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LESSON PLAN

Education Level                : Senior High School
Subject                              : Chemistry
Grade/ Semester                : X / I
Topic                                 : Chemical Laws and Stoichiometry
Sub Topic                          : Mole concept
  Molecular formula and Empirical formula
  Restraint Reactant
Academic Year                 : 2008/2009
Time Allocation                : 6 x 45 minutes
Standard Competence      : Understanding the chemical basic laws and its application on chemical calculation (stoichiometry)
Basic Competence            : Proving and communicating the implementation of chemical base laws through doing experiment and applying the mole concept in practicing chemical calculation.

I.             INDIKATOR
1.      mengkonversikan jumlah mol dengan jumlah partikel, massa, dan volume zat
2.      Determining the empirical and the molecular formula
3.      Determining the formula of hydrate
4.      Detrmining the content of element in a compound
5.      Detrmining the Restraint Reactant in the reaction
6.      Detrmining amount of the reactant and the product

II.          PURPOSE OF LEARNING
1.      Students of Senior High School Class X semester 1 can mengkonversikan jumlah mol dengan jumlah partikel, massa, dan volume zat
2.      Students of Senior High School Class X semester 1 can Determine the empirical and the molecular formula
3.      Students of Senior High School Class X semester 1 can Determine the formula of hydrate
4.      Students of Senior High School Class X semester 1 can Detrmine the content of element in a compound
5.      Students of Senior High School Class X semester 1 can Detrmine the Restraint Reactant in the reaction
6.      Students of Senior High School Class X semester 1 can Detrmine amount of the reactant and the product

III.       LEARNING MATERIAL
  • Mole concept
  • Molecular formula and Empirical formula
  • Restraint Reactant

IV.       LEARNING MODEL
Approach:   Process skill
Method  : Combination of discourse, discussion, and ask & questions.

V.          LEARNING SCENARIO
No
Learning Activities
Time
(minutes)
1.







2.







3.
Opening
Teacher opens the class by saying greeting and asks the presence.
Teacher conditioning the class so the students ready to accept materials.
Teacher reminds the students about the chemical laws
Teacher gives apperception
Main Activities
Teacher explain about diagram of mole concept and give example to apply it
Teacher ask student to do in the whiteboard
Teacher and student discuss the answer together
Teacher explain about determine of restraint reactant in the reaction
Teacher give exercise
Closing
Teacher reviews the material.
Teacher gives a chance to student to ask questions.
Quiz.
Teacher gives homework for next meeting.
Teacher gives information about the matter for next meeting.
Teacher closes the class by saying greeting.
3 x 5







3 x 70







3 x 15

VI.       LEARNING MEDIA
Chemistry books, students’ worksheet, white board and marker.

VII.    REFERENCES
Purba, Michael. 2006. Kimia untuk SMA Kelas X. Jakarta: Erlangga
Sunardi. 2007. Kimia Billingual untuk SMA Kelas X Semester 1 dan 2. Bandung: Yrama Widya.

VIII. ASSESSMENT AND FOLLOW-UP
a.       Assessment: Quiz, individual assignment, and group assignment.
b.      Continuing:
Student succeed if reach percentage ≥70 % from assessment.
Giving remedial for students whose reach <70 % from assessment

Semarang,   October  2008
Headmaster                                                                                     Teacher

………………..                                                                      …………………….. 
IX.       MATERIAL ANALYSIS

Diagram of mole concept
           Volume ofgas STP (V)
 
Mass (m)
 
Mole(n)
 
The number of particle
 
                                    : L                                            x Ar ot Mr                                                                   x L                                          : Ar or Mr                                                                   

                                                : 22,4               x 22,4






PV = nRT
 
At a certain pressure and temperature (non STP), the volume of a given gas can be determined based on the ideal gas equation, that is as follows.

                                    Keterangan :   P = gas pressure (atm)
                                                           V = volume of  gas (liters)
                                                            n = mol e of gas (mol)
                                                            R = gas constant(0,082 L. atm /mol. K)
                                                            T = temperature (K)

Molecular formula and Empirical formula
Molecular formula is a chemical formula that certain kind and the number of atom that is form molecular compound, empirical formula of a compound is the ratio of mole of the compound composer elements atom.
Example          CH2 = Empirical formula
                        C2H4, C3H6 = Molecular formula



The content of element in a compound
The relative atomic mass is defined as the ratio of the average mass per atom of an element to one twelfth of the mass of a carbon-12 atom, which mathematically can be represented as follows.
Ar X =
 
                                                           



The relative
Mr X =

 
 molecule mass is defined as the ratio of the average of a molecule or a unit of substance to one twelfth of the mass of a carbon-12, which mathematically can be represented as follows.






To know the mass of element in acompound can be represented as follows


mass of element in compound =
 
 







The content of element in a compound can be represented as follows
% content of element in a compound =

 
 



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