lesson plan

LESSON PLAN

Name of the Teacher Trainee : Amaladoss Xavier Subject : Physics / Chemistry

Name of the School : St.Xavier’s Hr.Sec.School Unit : Gas

Palayamkottai

Std. : IX – C Topic : SO₂(Sulphur Dioxide)

Date :

General Instructional Objectives (GIO):The Pupil

acquires scientific knowledge and method of enquiry into commercial substances
develops an idea of sulphur and its compounds in daily life
applies the scientific knowledge in laboratory preparation of SO₂ and chemical method
develops keen observation, reasoning capacity, scientific thinking, habit of criticism and judgment
develops skills in practical aspects and drawing diagrams
gets help in familiarizing himself with some scientific apparatus

Specific Instructional Objectives (SIO):The pupil

recalls the importance of sulphur dioxide in daily life
selects suitable apparatus and chemicals
draws accurate sketches and diagram neatly
sets up the apparatus in a planned manner
prepares sulphur dioxide in the laboratory
examines physical and chemical properties of SO₂
mentions the uses of SO₂
changes verbal statement into symbols and vice-versa
identifies the relationship between commercial method and laboratory method
puts questions in scientific discussion

Instructional Aids :

Chart showing the preparation of sulphur dioxide
Flash card showing volcanic eruption
Apparatus and chemicals :- Conc. H₂SO₄, KMnO₄, K₂Cr₂O₇, Mg,

Round Bottomed Flask, Gas Collecting Jars, Test Tubes, Bent Tubes, Moist Flowers, etc.

Concept :

Sulphur dioxide is prepared when sulphur burns in oxygen in a large scale.
Sulphur dioxide is prepared in the laboratory by heating copper turnings and Conc. H₂SO₄.
It is colourless gas with pungent smell, 25 times heavier than air, and highly soluble in water.
It oxidizes hydrogen sulphide to sulphur.
It reduces halogens into their respective hydracids.
It also reduces ferric to ferrous, pink coloured KMnO₄ to colourless solution, red orange K₂Cr₂O₇ to green colour chromium sulphate.
It bleaches moist coloured flowers and delicate materials.
It is used to preserve fruits and also employed in the preparation of sodium bisulphate and calcium bisulphate.

Approach : Lecture and Demonstration Method.

Stage	Specification	Content	Teaching Learning Experience	Evaluation
Motivation Presentation	Recalls the previous knowledge of sulphur and its compounds in life Sees the picture and recalls Observes and compares Observes the experiment	Diwali Experience Volcanic Eruption Burning a match stick Sulphur burns in Oxygen	Teacher makes the boys to recall experience about the Diwali festivel Tr.: During Diwali, What is the most striking feature? St.: The atmosphere is full of smoke with peculiar smell which is observed. Teacher narrates the incidents took place during volcanic eruption. People around the place suffer due to volcanic eruption. Tr.: What is the main product that comes out of volcanic eruption? St.: Sulphur, Sir. Teacher burns a match stick and blows off. Pupils are asked to smell the fumes. Tr.: Does this resemble your Diwali experience? St.: Yes, Sir Teacher burns sulphur in Oxygen and asks the question. Tr.: What happens when sulphur burns in Oxygen? St.: Sulphur dioxide Today we are going to learn the preparation of the sulphur dioxide and their properties (The teacher writes the topic on the black board.)
Stage	Specification	Content	Teaching Learning Experience	Evaluation
	Sees the chart and selects suitable apparatus Selects suitable chemicals Draws the diagram Tells the procedure orally Changes verbal statement into symbols	Display of apparatus Display of chemicals Laboratory preparation Heating Copper turnings and Conc. H₂SO₄	The following pieces of apparatus are displayed and pupils are asked to select suitable apparatus by seeing the chart. Different types of flask, test tubes, gas collecting jars, bent tubes, thistle funnel, etc. Different chemicals such as Cu+H₂SO₄, MnO₂+HCl, NaCl+H₂SO₄, K₂Cr₂O₇, FeCl₃, etc. are displayed and pupils are asked to choose. The experimental setup is arranged. Pupils are instructed to observe the setup of the experiment and draw the diagram. Copper turning are taken in a round bottomed flask and conc. H₂SO₄ is added through the thistle funnel. The flask is heated. The coming gas is passed into wash bottle containing Conc. H₂SO₄, which observes traces of water. The pure gas is collected by the upward displacement of air Teacher writes the balanced equation on the board Cu+2H₂SO₄ → CuSO₄+2H₂O+SO₂↑	What are the apparatus needed for preparation of SO₂ ? List out chemicals needed for preparation of SO₂? What are the parts of the diagram? How do you collect SO₂ gas? What is the role of Conc. H₂SO₄ in the wash bottle? Write down the balanced equation between Copper and Conc. H₂SO₄
Stage	Specification	Content	Teaching Learning Experience	Evaluation
	Identifies the properties Distinguishes between related properties Observes the reaction Observes the changes in colour and reasons out	Physical properties Chemical properties are tested. SO₂+H₂O SO₂+NaOH Mg +SO₂ Oxidation Reaction Reduction action	Pupils are asked to observe the reaction. The gas is collected in three gas collecting jars. Teacher verifies the physical properties. Pupils learn that sulphur dioxide is colourless gas and pungent smell. It is collected by upward displacement of air. It shows that it is heavier than air. It is highly soluble in water. Chemical properties are tested with test tube experiments. I. Action of water: SO2 is an acid oxide. It dissolves in water forms sulphurous acid. SO₂+H₂O → H₂SO₃ SO₂ reacts with alkali to form salt and water SO₂ + NaOH → Na₂SO₃ + H₂O II. Action with Metals : Magnesium burns in SO₂, Magnesium oxide and magnesium sulphide are produced. 3Mg + SO₂ → 2MgO + MgS III. Sulphur dioxide oxidizes hydrogen sulphide to sulphur H₂S + SO₂ → 2H₂O + 3S IV. Reduction Reaction : SO₂ reduces halogens to their respective hydracids. a. SO₂ + 2H₂O + Cl₂ → H₂SO₄ + 2HCl SO₂ + 2H₂O + Br₂ → H₂SO₄ + 2HBr	Given below are the properties of the gas. Tick the properties which are relevant. 1.It is colourless gas with pungent odour 2.It is greenish yellow gas 3.It is highly soluble in water Write down the balanced equation between sulphur and alkali What happens when Mg burns is SO₂? Write down the balanced equation between SO₂ and Cl₂
Stage	Specification	Content	Teaching Learning Experience	Evaluation
Recapitulation Assignment	Mentions the uses Summarizes Recalls	Bleaching action Uses Revision and Consolidation Assignments are given	b. Ferric chloride reduces to Ferrous Chloride 2FeCl₃ + SO₂ + 2H₂O → 2FeCl₂ + H₂SO₄ + 2HCl Brown Colourless c. Pink colored KMnO4 is reduced to colourless Manganese sulphate 2KMnO₄ + 2H₂O + 3SO₂ → K₂SO₄ + MnSO₄ + 2H₂SO₄ Pink colourless d. Red orange K₂Cr₂O₇ is reduced to green colour chromium sulphate. K₂Cr₂O₇ + H₂SO₄ + 3SO₂ → K₂SO₄ + Cr₂(SO₄)₃ + H₂O Redorange green Sulpher dioxide bleaches moist flowers to colourless. Uses of sulpher dioxide is analysed and written on the black board. 1.It is used to bleach delicate materials such as wool, feather, etc. 2.It is used as an anti-chior 3.It finds application in preserving fruits. 4.It is employed in the preparation of sodium bisulphate and calcium bisulphate. Teacher summarizes and consolidates How will you prepare SO₂ in the laboratory? What are the physical properties? What are the chemical properties? What is reducing agent? What are its uses? Compare the properties of SO₂ with that of Chlorine.	What happens when ferric chloride react with sulphur dioxide? Pink coloured KMnO₄ reduces to _________ Manganese Sulphate Red Orange K₂Cr₂O₇ reduces_______ colour chromium sulphate. What are the uses of SO₂?

Signature of the Teacher Trainee Signature of the Guide Teacher

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