Materials
Heating Materials
Name: Hadeel Armanazi
Subject: science
Title :Heating Materials
Mentor Teacher: Rahaf Attaya
Date taught 12 / 5 /2009
Grade: two
Duration: 45 minutes, 3rd block
Objectives:
The student will be able to
 Predict what will happen to some materials when heating them .
 Carry out an investigation to conclude what will happen to following
materials (ice cubes and chocolate) when heating them .
 Define the following scientific terms, solid ,liquid , heat, melt , by
using their own words and the support of their mother tongue .
Standard:
7.6 Know that many materials can be changed either temporarily or permanently
by heating.
1.3 Make predictions about the outcome of an investigation.
1.2 Draw conclusions from observations and data.
Materials:
Transparent plastic bags, cubes of ice , chocolate pieces ,for teacher only :
bowl of hot water , worksheets , flash cards
Resources:
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Science scheme of work /changing materials/ grade 2
www.perasonpublishing.co.uk/education/samples ( some ideas )
CGP science book / Key stage One / Materials (worksheet) page 23 .
The song at the end is from New star science – changing materials –page 16
Activating prior knowledge/ Warm up:
Remind students of previous lesson . Ask them to explain the meaning of
flexible materials . Remind them how they carried out an investigation to see
how we can change the shape of some materials temporally or permanently .
Tell students today we will carry out an investigation to answer the following
question ( what will happen to chocolate and ice when heating them ?
Allow each pair to talk and predict what might happen .
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Teaching strategy
 Show students a cube of ice . Ask them " Can you catch this cube ?
Can we play with it ? yes.
 Write solid on the board and explain how solid means something we
can hold in our hands .Encourage students to give more examples of
solid objects (table, disks, pencils --)
 Show students a cup of orange juice . Ask them can we touch it? (yes)
Can you throw it like a ball to your friend ? (No )
 Write liquid in the board . Ask children to give more examples of
liquids ( water , apple juice , milkshake --)
 Place flash cards of ( solid and liquid ) . Encourage students to read
them aloud .
 Remind students of Today's question (what will happen to chocolate
and ice cubes when heating them ?
 Divide the class into groups of three girls .
 Give each group two plastic bags ,one contains chocolate pieces ,the
other one contains ice cubes .Give each group a worksheet 1 to write
down their predictions and the conclusion .
 Tell students that we have to investigate those materials when
heating them . Explain to the students how hot water is dangerous for
their skin that’s why we have to find another way to heat those
materials . Encourage them to think about other sources that give us
heat .
 Ask students to rub their hands quickly . Ask them : What do you
feel when you rub your hands quickly ?( Heat /hot) . Tell them that we
will use the heat of our hands to investigate those materials.
 Ask each group to write down their prediction of what will happen to
the chocolate and ice when rubbing it .
 Ask each group to start their investigation and to start rubbing the
two plastic bags which contain materials .
 Encourage them to go back to the paper and draw what happened
after applying the heat from their hands .
 Ask them to describe what happened to chocolate and ice.
 Introduce the verb melt to the students .
 Encourage students to conclude that " applying a heat on some
materials can change it from solid into liquid like ice and chocolate
when it is melted .
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For safety reason , I will put chocolate and ice in real hot water bowl
to show students how those two materials can be melted .
Explain the worksheet page 23 .
Students’ Activity:
o Look and think of the description of ice cube as solid object
and orange juice as liquid .
o Give examples of solid and liquid materials .
o Identify how hot water is dangerous for their skin.
o Think about other sources of the heat .
o Conclude that we can produce a heat when rubbing our hands
together quickly .
o Write down their predictions before rubbing the three plastic
bags .
o Carry out the investigation as group work .
o Write down what happened after applying heat to the material .
o Describe what happened to the chocolate and the ice in the
plastic bags .
o Observe the teacher while placing the three materials in real
hot water bowl .
o Individual worksheet page 23 .
Closure:
Ask students to summarize what they have learnt today . Ask them to list
the new scientific terms for today : heat – melt – liquid and solid and what
did they discover in today's lesson. Encourage students to repeat the terms
while pointing at the flash cards on the board . Sing the song of chocolate
and encourage students to think about its meaning .
Lesson Extension and/or Modification:
Lesson extension: Ask children to think and draw some materials that will be
melted when applying a heat to it .
For advanced students: Encourage students to answer the following question
( which melt more quickly big pieces of chocolate ? Small piece of chocolate?
Why ?
For beginners : Pair them with advanced learners to help them conclude the
results . Provide extra assistance while carrying out the investigation .
For visual learner: Looking at the flash and the word cards of the scientific
terms will help them .
For musical learners: singing the song will help them .
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For bodily/kinesthetic learners : rubbing the plastic bags will help them
move their hands
Assessment:
By observing students while doing the group work I can informally
assess students' understanding.
By participation and answering the teacher's question the teacher can
informally assess students' understanding .
By correcting the worksheet I can assess students' understanding
Reflection :
This lesson was fun for students. All my students liked the idea of rubbing
and see what will happen to the materials after heating. Sometimes, they
couldn't express what happened in English. Therefore, I have to rephrase
their sentences in English. They also liked the idea of tasting how the
chocolate would be melt in their mouths .However , I think it would be
better to modified the worksheet to have more drawing than writing to suit
students' levels.
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Material
Predict what will
happen when
heating it
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Draw your result
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