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.
