Science Unit 3 — Change ⏱ ~25 min Checkpoint 1

Checkpoint 1

Review the key ideas from Lessons 1-5, then test yourself with 10 multiple-choice questions and 3 short-answer questions.

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Quick Review

1

What Is Change in Matter?

Focus:

Key terms: Matter, Change, Property

2

Physical Change vs Chemical Change

Focus:

Key terms: Physical change, Chemical change, Precipitate

3

Particle Model of Physical Change

Focus:

Key terms: Particle, Kinetic energy, Melting point

4

Evidence of Chemical Reactions

Focus:

Key terms: Chemical reaction, Reactant, Product

5

Change Synthesis and Checkpoint 1 Preparation

Focus:

Multiple Choice (10 questions)

1. Which of the following is an example of matter?

AA shadow
BA cloud
CA sound wave
DA rainbow

2. Which statement best describes a physical change?

AA new substance is formed
BThe substance looks different but is still the same material
CEnergy is always released as heat
DThe change cannot be reversed

3. Which of the following is a physical change?

ABurning wood
BRusting iron
CMelting butter
DBaking a cake

4. What is produced during a chemical change?

AOnly heat
BA new substance
COnly light
DNo change at all

5. According to the particle model, what happens to particles when a solid melts?

AThey break apart into atoms
BThey gain energy and move more freely
CThey stop moving completely
DThey turn into a new substance

6. Which state of matter has particles that are farthest apart?

ASolid
BLiquid
CGas
DPlasma

7. Which of the following is a product in a chemical reaction?

AA starting material
BA substance that is used up
CA substance that is formed
DA catalyst

8. What does effervescence indicate during a reaction?

AA solid is dissolving
BA gas is being produced
CThe temperature is dropping
DA precipitate is forming

9. Which of the following is a physical change?

ABurning paper
BMelting wax
CRusting iron
DBaking bread

10. 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

Short Answer (3 questions)

SA1

Define 'matter' and give two examples from your kitchen. (2 marks)

Write your answer in your book.
SA2

Describe two differences between physical and chemical changes. (2 marks)

Write your answer in your book.
SA3

Use the particle model to explain why liquids take the shape of their container. (2 marks)

Write your answer in your book.
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