CER Framework Answer Key

Name:

Date:

📚 Part 1: Understanding the CER Framework - ANSWERS

1. Fill in the CER acronym:

C = Claim

E = Evidence

R = Reasoning

2. Match each CER component with its definition:

Claim → A statement that answers the scientific question

Evidence → Data or observations that support your claim

Reasoning → Scientific explanation of how evidence supports the claim

3. Why is the CER framework important in science?

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It helps organize scientific thinking

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It makes explanations clearer

It makes experiments faster

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It connects evidence to conclusions

🏗️ Part 2: Toothpick and Marshmallow Structure Experiment - SAMPLE ANSWERS

4. Write a scientific explanation using the CER framework:

CLAIM:

Sample: Triangular structures are stronger than square structures when built with toothpicks and marshmallows.

EVIDENCE:

Sample: The triangular tower held 15 books before collapsing, while the square tower held only 8 books. The triangular structure also remained stable when shaken gently, but the square structure wobbled.

REASONING:

Sample: Triangles distribute weight evenly across all three sides, creating a more stable base. In engineering, triangular shapes are known for their strength because forces are spread equally, preventing any single point from bearing too much weight.

🤔 Part 3: Reflection and Application - SUGGESTED ANSWERS

5. How did using the CER framework help you organize your thoughts?

Sample answers: It made me think step-by-step; It helped me separate what I observed from what I concluded; It forced me to explain my reasoning clearly

6. Give an example of when you might use CER outside of science class:

Sample answers: Arguing for a later bedtime (claim + evidence of good behavior + reasoning about responsibility); Choosing which movie to watch (claim + evidence of reviews + reasoning about preferences)

7. What was the most challenging part of writing your CER explanation?

Sample answers: Connecting evidence to reasoning; Finding enough evidence; Explaining the science behind my observations; Keeping claim, evidence, and reasoning separate