Lesson Plan of Effects of Heat on Solids, Liquids and Gases General Science Grade IV



Lesson Plan of Effects of Heat on Solids, Liquids and Gases

General Science Grade IV

Students’ Learning Outcomes

·         Demonstrate and explain how matter changes its state on heating.

Information for Teachers

·         One state of matter can be changed into another by heating.
·         Solid ice changes into liquid water with heat or keeping it at room temperature for some time.
·         Similarity liquid water changes into steam (gas) on heating.

Material / Resources

Ice, water, glass, candle, match box, stainless steel glass, handkerchiefs, textbook

Worm up Activity

·         Take a handkerchief and soak it in water.
·         Ask students to touch it.
·         Spread it out in the open air for half an hour.
·         Show it to the students and ask them to touch it again.
·         Ask students what happened to the handkerchief?
·         Where did the water go?
(Expected response: Water escape in air in the form of vapors)
·         How did the liquid water disappear or change into vapors?
(Students’ response: water absorbed heat from surroundings and changed into vapors)

Development



Activity 1

·         Place some pieces of ice in a glass.
·         Heat the glass gently with the help of a candle or a spirit lamp.
·         Ask the students to observe what will happen to the ice and why.
·         Students observe and then answer the following questions:
·         What happened to the ice? (it melted)
·         How did it change into liquid water? (by heating)
·         Inform them that upon heating, a solid changes into liquid. Ask them:
·         Why does water trickle down from a vehicle carrying ice?
·         Why does a burning candle melt?

Activity 2

·         Take 10-15ml water in a stainless steel glass/beaker or any container.
·         Heat it with the help of a candle or a spirit lamp.
·         Ask students to observe and then answer the following questions:
·         What has happened to liquid water?
(Students’ response: Heat has changed water to steam or water vapors)
·         Which state of matter is steam? (Steam is gas)
·         Conclude that upon heating a liquid turns into gas vapors.
·         Ask what will happen if we keep heating water?
(Expected response: water will turn into steam)
·         Why does sweat dry while sitting under a fan?
(Expected response: Sweat will change into vapors)
Sum up / Conclusion
·         Conclude the topic by telling that: One state of matter can be converted into another state either by heating or cooling.
·         Liquid water can be changed to steam or vapors by heating.
·         Water vapors present in air can be changed to liquid water by cooling.

Assessment

·         Ask students: Write their observations from everyday life where water is changed into steam and into ice.
·         When ice is placed in an open container it melts into liquid water after sometimes. From where does it get heat?

Follow up

·         Instruct them to:
v  Take a small quantity of water in a plate.
v  Put that plate under the sun.
v  Observe what happens to the water after a few hours.
(Students’ response: the whole water has disappeared and the plate has dried up)
·         Ask the students to note down their observation and discuss with their class fellows next day.
          

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