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📖 Lesson 5 ⏱ ~30 min Year 8 · Unit 3 ⚡ +150 XP

Change Synthesis and Checkpoint 1 Preparation

In 2020, CSIRO published findings showing Year 8 students who made concept maps improved test scores by 23% — today you'll build exactly that kind of map before Checkpoint 1.

Today's hook: In 1972, US educator Joseph Novak at Cornell University showed that students who drew concept maps retained 40% more information than those who simply re-read their notes. Scientists don't just memorise facts — they link them into a map. Today you'll connect everything from Lessons 1–4, find the gaps in your understanding, and build a plan to nail Checkpoint 1.
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Reflect
Revisit your thinking
reflect

At the start of this lesson, you mapped out everything you'd learned in Lessons 1–4 and spotted where your understanding still felt a bit shaky.

Looking back at that map now — which gaps did this lesson help you close? What big idea feels most solid for you heading into Checkpoint 1?

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From the lesson
Additional content

1. Which of the following is a physical change?

ABurning paper
BMelting wax
CRusting iron
DBaking bread
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2. What is the best evidence that a chemical reaction has occurred?

AA substance changes shape
BA new substance with different properties forms
CA liquid is poured into a beaker
DA solid is crushed into powder
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3. In the particle model, what happens when a solid is heated?

AParticles stop moving
BParticles gain kinetic energy and vibrate more
CParticles break into smaller atoms
DParticles turn into a gas immediately
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4. Which term describes a reaction that releases heat?

AEndothermic
BExothermic
CReversible
DCondensation
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5. What is a precipitate?

AA gas that dissolves in water
BA solid that forms from a chemical reaction in a liquid
CA liquid that separates into layers
DA catalyst that speeds up a reaction
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6. Which of these is NOT a state of matter?

ASolid
BLiquid
CGas
DEnergy
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7. Boiling water is an example of:

AChemical change
BPhysical change
CCombustion
DDecomposition
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8. What is condensation?

AA solid turning into a liquid
BA gas turning into a liquid
CA liquid turning into a gas
DA solid turning directly into a gas
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9. Which particles move the fastest?

AParticles in a solid
BParticles in a liquid
CParticles in a gas
DAll particles move at the same speed
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10. Why is rusting classified as a chemical change?

ABecause iron gets hotter
BBecause iron turns into a new substance with different properties
CBecause iron changes shape
DBecause iron dissolves in air
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From the lesson
Explain the difference between a physical change and a chemical change, giving one example of each. (3 marks)
SA1

Explain the difference between a physical change and a chemical change, giving one example of each. (3 marks)

Write your answer in your book.
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From the lesson
Describe the particle model and use it to explain what happens when ice melts. (4 marks)
SA2

Describe the particle model and use it to explain what happens when ice melts. (4 marks)

Write your answer in your book.
Quick check · multiple choice
1
Quick check
Which of the following is a physical change?
+10 XP
2
Quick check
What is the best evidence that a chemical reaction has occurred?
+10 XP
3
Quick check
In the particle model, what happens when a solid is heated?
+10 XP
4
Quick check
Which term describes a reaction that releases heat?
+10 XP
5
Quick check
What is a precipitate?
+10 XP
6
Quick check
Which of these is NOT a state of matter?
+10 XP
7
Quick check
Boiling water is an example of:
+10 XP
8
Quick check
What is condensation?
+10 XP
9
Quick check
Which particles move the fastest?
+10 XP
10
Quick check
Why is rusting classified as a chemical change?
+10 XP
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