Third week of Teaching Practice

Hi all,

      The past week has been great. The teaching practice experience with the students was productive for me. Students were cooperative and were keen to learn Physics in Class Nine and Chemistry in Class Eight. 

Topics Covered this week:

• Soft drinks, 
• Suspensions,
• Work,
• Metals,
• General Characteristic of Metals,
• Work Energy Principle,
• Law of Conservation of Energy.

Soft Drinks

• When I showed the above-shown picture students were very curious and interested to know more about the class topic.
• Students were asked whether they are interested in drinking soft drinks?. Of course, the answer was a big yes!
• One of the student was asked to read the ingredients in the cover of the soft drinks and identify the chemicals present in it.

• Students understood that because of stabilizer added in it keeps the juices in colloidal form and the particles do not settle down even after storing it for long time.
• Examples of stabilizers were given such as Brominated Vegetable oil, Sucrose acetate isobutyrate and Glycerol ester of Rosin.
• Students were taught also on different types of chemicals added in soft drinks that make them attractive by showing them the chart.

Chemical   Substance	Juice/Food materials to which it is added	Use
Tartrazine	Food Material	Coloring agent (Yellow)
Erythrosine	Food Material	Coloring agent (Red)
Vanillin	Food Material	Taste enhancer
Phosphoric Acid	Soft Drinks	To give sour taste
Allyl hexanoate	Food Material	For fragrance (pineapple)
• Students were taught how dangerous it is to use Chemicals in food materials and how continuous used of soft drinks affects their health

Suspensions

• One of the Student was asked to prepare a solution by adding 2g of Sodium thiosulphate in a beaker containing 50 ml of water. A beam of light was passed through the beaker and few drops of dilute hydrochloric acid was added and stirred.
• Discussion points given were:
• Observation?
• Is the path of the ray becoming clear?
• Is the suspension a homogeneous mixture?
• Students understood that sulphur gets precipitated when sodium thiosulphate reacts with dilute hydrochloric acid. Before the chemical reaction, the mixture existed as a solution. Within a few seconds, as more and more sulphur particles form, they aggregate together. The particle size thus gets bigger and forms a colloid making the path of the light beam visible. Further, more and more sulphur particles get separated and the size of particles keep on increasing. Thus the mixture becomes a suspension.

Work

• One of the Student was asked to lift an object to a height 'h' m and asked about 
• the forces experienced by the body,
• If the body is to be raised through a height 'h' metre, What should be the work done?
• Students were explained how when a body is raised to a height h, the work done against the gravitational force would be W = mgh and activity containing questions was given. 
• At last below shown picture was shown

• Students were taught how when a body on a floor is pulled and if it is displaced in the direction of applied force, the work done by the applied force will be positive and the work done by the frictional force exerted by the floor will be negative.

Metals

General Characteristic of Metals

• Class began with the discussion of different types of metals used in kitchen.
• A below shown table was shown 

• Students were asked below mentioned questions
• Aren't you familiar with the arrangements of elements?
• Write down some of the familiar elements?
• Among them, are these metallic elements? which are they?
• Students understood that iron, gold, silver, zinc are the examples of metals and that in the periodic table all the elements in the two columns on the left, in the middle and two rows below are metals.

• The above-shown picture was shown and arrived at a concept that metals are generally made up of hard substances and when rubbed against hard surface, the surface of the metal shine.
• A below-shown shown on Electrical Conductivity and questions were asked from it.

Work Energy Principle

• Class begin with recalling the basic concepts of work.
• A student was called in front of the classroom and was asked to apply force in the direction of motion of the body.
• The below-shown picture was shown in a chart and arrived at the concept of workdone = change in kinetic energy.

•  An activity sheet was given to find out the work done and the displacement when a force of 10N is applied for 20s on a stone of mass 5 kg at rest and the when stone moves in the direction of force.

Law of Conservation of Energy

 

• Class began by showing the slide posted above and following questions were given to students

• After discussion and calculation, students arrive at the concept of law of conservation of energy that " Energy can neither be created nor destroyed. Energy can only be transformed from one form to another." 
• This class was taught in constructivist model and student actively participated in all activities. 

This is all for the week. So far it has been so much that I have learned. Hopefully, Next Friday (6/12/2019) I will be sharing some more of my teaching experience. Good Bye.