Introduction
Subject: Science
Date: May 18, 2020
Duration: 1 hour 30mis
Topic: Matter
Sub topic: changing matter from one state to another
Objective: 1. What is matter?
2. Identify the three states of matter
3. Changing state of matter.
4. Properties of matter
Matter is anything that has weight and takes up space.
Three states of matter: Liquid, solid, gas
List three different state of matter around your house
Liquid solid gas
1.
2.
3.
Complete page 126 &127 in science textbook
Task
- Read the story below about Mashadu.
- Answer the questions which follow.
Mashadu is a boy in Grade 1 at a primary school in a small village which gets very hot in summer. He loves to play soccer. After school he often goes over to The Thunderbolt School of Learning to play with the Thunderbolt Kids. They really like having Mashadu to play with them even though he is a few years younger, because he is very talented and also fun and caring. Mashadu especially likes Jojo and they play well together as a team.
One day after school, Mashadu thought he would do something nice for his friends, the Thunderbolt Kids and surprise them with ice lollies for when they were finished playing. Mashadu bought 5 ice lollies, one for himself and one for each of the Thunderbolt Kids. He put the ice lollies in a bowl and placed some ice blocks around them to keep them cool. Mashadu then ran off to join the others playing soccer.
After the game, Mashadu ran back to the bowl to get the ice lollies. But he got such a shock when he got there. They were all gone! He was so upset and started to cry. The Thunderbolt Kids saw the Mashadu was upset and ran over to see what was wrong.
"Hey Mashadu, what's wrong?! Did you hurt yourself while playing?" Jojo asked.
"No, I didn't. I bought some ice lollies for all of you as a surprise and when I came back now to get them they were all gone! I think someone stole and ate them and just left the sticks! Look!" Mashadu cried out.
"Oh no, don't cry Mashadu! It's not your fault, and no one stole them or ate them either," Farrah said while rubbing Mashadu on the back.
"Yes, Mashadu, actually we learnt in class today about what happened to your ice lollies," said Sophie, "and I can explain it to you too. Do you see that your bowl is actually not empty? There is a liquid in it. And it also has a red colour, which was the colour of your ice lollies."
"Yes, I see that," answered Mashadu, "but then how did that happen?"
Tom then answered, "Your ice lollies melted from the heat from the air around us. Even if the sun was not so hot, they would have melted! For something to stay frozen it needs to be at a very cold temperature, like in a freezer."
"Yes, melting is when heat causes the solid ice lollies to change into a liquid," Sophie replied, "So no one stole the ice lollies, they just melted."
"Oh ok, I see," said Mashadu, "I must be really silly not to know that!"
"No, not at all Mashadu! We only learned about it today in class and we are in Grade 4!" laughed Farrah.
"I know what we should do!" shouted Jojo, "Let's go to the tuckshop right now. I have some extra change and we can buy some more frozen ice lollies!"
They all really liked this idea, especially Mashadu who was now laughing. So off they all went, the Thunderbolt Kids and Mashadu, and bought some more ice lollies and sat under the tree to eat them.
QUESTIONS:
What is the name of the main character in the story?
What grade are the Thunderbolt Kids in?
What game are the children playing together after school?
When the ice lollies are frozen, are they a solid, liquid or a gas?
Explain in your own words what happened to the ice and the ice lollies while they were left in the sun.
What is the name given to this process?
Do you think you can reverse the process of melting? How would you do this?
Process
So what have we learned from Mashadu's experience with the ice lollies?
1.When they were placed in the sun, they started to warm up. This heat caused a state change to take place. The ice changed to a liquid. This is called melting.
2. When they get new ice lollies from the tuckshop, these ice lollies were frozen, but they were made from a liquid. As heat was removed, they froze. When a liquid changes to a solid, this is called solidifying.
3.Evaporation takes place when heat is added to the liquid. It means the water changes from the liquid to the gas state.
Evaluation
Complete the following question
1. Water changing from solid to liquid is called ________________________
b. Explain your own words what happen to the solid when it turns to liquid
__________________________________________________________________________________________________________________________________________________________________________________________________________________________
2. Water changing from liquid to solid is called ________________________
3. Water changing from liquid to gas is called _________________________
Conclusion
Home work complete mini review on pages 128- 131 in science textbook.