Turn your students into science detectives with this NO PREP, engaging, real-world investigation focused on why some substances dissolve while others do not. In this case file activity, students analyze dissolving observations, examine temperature effects, compare different substances in water, evaluate mixing results, rank possible causes, and build a scientific case to solve the mystery of why certain materials dissolve easily while others remain unchanged.

Instead of passively reading about solutions and solubility, students actively investigate, analyze patterns, and reason through the evidence to uncover how particle interactions between solutes and solvents determine whether a substance dissolves. This activity makes solutions, particle interactions, and chemical properties interactive and easy to understand while strengthening critical thinking and literacy skills.

✅ NO PREP, no formatting, no issues. Simply download and go. Includes all instructions, answer key, rubric, and background reading students need to solve the case. This mystery is included inside my Chemistry in Everyday Life Mystery Activity Bundle.

10-Part Activity Breakdown

Part 1 – Mission Briefing:
Students are introduced to a case involving substances placed in water where some dissolve completely while others remain visible.

Part 2 – Background Reading:
Students build foundational knowledge about solubility, solutions, solutes, solvents, and how particle interactions affect dissolving.

Part 3 – Evidence Log:
Students examine 10 detailed evidence cards related to dissolving observations, temperature changes, stirring effects, particle distribution, solution clarity, and comparisons between different substances.

Part 4 – Suspect Ranking:
Students rank possible explanations (type of solute, type of solvent, temperature of the water, mixing/stirring, particle interactions) and justify their reasoning using scientific evidence.

Part 5 – Pathway Tracking:
Students trace how dissolving occurs from solute particles separating → interacting with solvent particles → spreading evenly throughout the solution.

Part 6 – Impact Analysis:
Students analyze how particle interactions, temperature, and mixing influence the dissolving process.

Part 7 – The Big Question:
Students explain why some substances dissolve while others do not using evidence from the case.

Part 8 – CER Writing:
Students construct a scientific argument using Claim–Evidence–Reasoning.

Part 9 – Solutions & Action Plan:
Students propose strategies for improving dissolving in laboratory investigations and real-world situations.

Part 10 – Reflection:
Students reflect on how solubility explains everyday processes such as mixing drinks, dissolving salt in water, or cleaning with solutions.

What Students Will Learn

• What it means when a substance dissolves
• The difference between a solute and a solvent
• How solutions form at the particle level
• Why some substances dissolve in water while others do not
• How temperature affects dissolving
• How stirring affects particle distribution
• Why dissolved substances may become invisible but still present
• How particle interactions determine solubility
• How to use Claim–Evidence–Reasoning (CER) to support scientific explanations
• How chemistry explains everyday dissolving processes

This activity blends chemistry, environmental science, Earth science, critical thinking, and literacy skills into one high-interest, structured lesson that keeps students thinking like real-world chemical investigators.

This Mystery Is Perfect for:

• Chemistry in Everyday Life units
• Solutions and mixtures lessons
• Solubility investigations
• Physical science classes
• Sub plans, review days, or project-based learning

No prep, no formatting, no issues.

Simply download, print (or upload to your class site) and you're all set.

What’s Included

• A complete student case file with guided worksheets for every step of the investigation
• 10 detailed evidence cards based on real-world chemistry issues --> Evidence cards include two versions: one with images and one without images
• A full teacher answer key with sample responses and grading support
• A full marking rubric that covers all key aspects of the mystery activity

Why Teachers Love This Resource

• Fully structured and print-and-go – Everything is ready to use with clear directions and built-in scaffolding
• High engagement without extra classroom management – The detective format naturally hooks students
• Real-world relevance students immediately understand
• Builds both science and ELA skills – Includes analysis, explanation, and CER writing
• Flexible for any schedule – Use in one class period, over two days, or as a mini-project

Time Required

• 2 class periods
• Can be extended into a 3-day mini-project

The following Mystery Activities can be found inside my Chemistry in Everyday Life Mystery Activity Bundle.

1. The Acid Rain Mystery
2. The Household Cleaning Products Reaction Mystery
3. The Conductivity Case Mystery
4. The Energy Release Mystery
5. The Phase Change Puzzle Mystery
6. The Missing Mass Mystery
7. The Ozone Layer Mystery
8. The Plastic Breakdown Mystery
9. The Solubility Surprise Mystery
10. The Spoiled Food Mystery

Google Classroom and Distance Learning Ready

• This resource is perfect for in-class or distance learning and integrates seamlessly with Google Classroom.
• It automatically creates a copy of the reading and places it directly into your Google Drive with a single click.
• Purchase → Open → Click → Assign to your students
• The reading also includes a Microsoft Word and PDF version.
• Having all three options allows you to assign the activity without worrying about formatting issues, and ensures access for all students regardless of device or learning environment.

No prep, no formatting, no issues. Simply download, print (or upload), and you're all set.

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If you have any questions please feel free to send me an email - devon@teachwithfergy.com