LESSON TRANSCRIPT

                       

             INDUCTIVE THINKING MODEL

Name of school    :                                                                 Standard:  8                          Name of teacher   :  Sandhya v s                                             Date       :                            Subject                  :Chemistry                                                                      Unit                       :Atoms, Molecules                                                          Topic                     :Chemistry

NAME OF THE CONCEPT  :Pure substance and mixtures

OBJECTIVES  

·         Pupils develop observation skills.

·         Identification of pure substance and mixtures.

·         Generalization about properties of pure substance and mixtures.

·         Pupils develop hypothesizing predicting result.

PHASE 1  :DATA CATEGORIZATION

T:  What is the common properties of water, tea, oils, kerosene, dossa, idly,curry?

S:  They are liquids and some are solids.

T:  Can you name some of the liquids and solids that we use in our daily life?

S:  Yes, muddy water, tea, milk, honey, snacks items, rice water, sugar solution, glucose, saltsolution..

T:  Can you group these examples and name them according to their similarities?

S:  Yes teacher we can.

T:  OK, try it.

GROUP A	GROUP B
Milk Honey Glucose Sugar Salt Oil Kerosene Water	Tea Rice water Muddy water Salt solution Sugar solution Dossa Idly Curry

PHASE 2  :INTERPRETATION OF DATA

T:  Let us analyse each group of examples and know more about them.

     What is the peculiarity of liquid in group A?

S:  Contains both liquids and solids.

T:  Ok, anything more,

S:  In group A only one substance is present.

T:  Yes, you are right. They are called pure substance.

      What about group B?

S:   In group B both the liquids and solids contains more than one substance.

T:  Yes, they are called mixtures.

      Can you give definition for both pure substance and mixtures?

S:  No teacher.

T:  Ok, pure substances are the substances which contains only one type of molecule.

      Mixtures are the substances which contain more than one type of molecule.

PHASE 3   :APPLICATION OF GENERALIZATION

T:  Now I will give you examples of different substances. You name its type.

S:  Ok.

T:  Silver.

S:  Pure substance.

T:  Why it is called pure substance?

S:  It contains only one type of molecules.

T:  Yes right, now lime juice.

S:  Mixture.

T:  Why it is mixture?

S:  Because it contains lemon and water, two substances.

T:  Ok, I give you two pictures. Identify which is pure substance and which is mixture. 

                A                                              B

S:  Picture A is mixture and picture B Is pure substance.

T:  Yes, right, so pure substance contains only one type of molecule and mixture contains

       More than one type of molecules.