Science Unit 3 — Change ⏱ ~25 min Checkpoint 3

Checkpoint 3

Review the key ideas from Lessons 11-15, then test yourself with 10 multiple-choice questions and 3 short-answer questions.

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Quick Review

11

Variables in Change Investigations

Focus:

Key terms: Variable, Independent variable, Dependent variable

12

Collecting and Interpreting Reaction Data

Focus:

Key terms: Quantitative data, Qualitative data, Reliability

13

Modelling Chemical Change

Focus:

Key terms: Model, Chemical equation, Word equation

14

Change in Natural and Human Systems

Focus:

Key terms: Carbon cycle, Greenhouse effect, Ocean acidification

15

Unit Synthesis and Depth Study Preparation

Focus:

Key terms: Synthesis, Depth study, Scientific report

Multiple Choice (10 questions)

1. In an experiment to see how the amount of bicarb soda affects the height of a volcano reaction, what is the independent variable?

AThe height of the reaction
BThe amount of bicarb soda
CThe temperature of the room
DThe type of vinegar used

2. What is a controlled variable?

AA factor that is measured
BA factor that is deliberately changed
CA factor that is kept the same
DA factor that is ignored

3. Which of the following is qualitative data?

A25 seconds
B5 grams
CBlue colour
D100 millilitres

4. What does reliability mean in an experiment?

AThe results match the hypothesis exactly
BThe results are consistent when repeated
CThe experiment was fun to do
DThe equipment was expensive

5. What is the main purpose of a scientific model?

ATo copy reality exactly
BTo simplify and explain complex ideas
CTo replace all experiments
DTo prove a hypothesis is correct

6. In a balanced chemical equation, what must be true?

AThe reactants and products have the same colour
BThe number of each type of atom is the same on both sides
CThe reaction happens instantly
DThe products weigh more than the reactants

7. Which process removes carbon dioxide from the atmosphere?

ARespiration
BCombustion
CPhotosynthesis
DDecomposition

8. What is ocean acidification caused by?

AExcess oxygen in the water
BAbsorption of carbon dioxide by oceans
CToo much salt in the ocean
DUnderwater volcanic eruptions only

9. Which of the following best describes a depth study?

AA short quiz on one topic
BAn extended investigation into a scientific question
CA summary of a textbook chapter
DA list of definitions to memorise

10. What is the purpose of evaluating limitations in a scientific report?

ATo make the report longer
BTo show awareness of what could have affected the results
CTo avoid doing any practical work
DTo prove the hypothesis was correct

Short Answer (3 questions)

SA1

Define 'independent variable', 'dependent variable', and 'controlled variable'. (2 marks)

Write your answer in your book.
SA2

Distinguish between accuracy and reliability, giving one example of each. (2 marks)

Write your answer in your book.
SA3

Explain why models are useful but also limited when representing chemical change. (2 marks)

Write your answer in your book.
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