Week 1: Week 1 Content
Grade 7 Science | Rosche | Kairos Academies
Scientists Like Us: In this lesson, you'll work as a team of scientists investigating chemical reactions. Every scientist brings unique perspectives—your ideas matter!
Community Connection: This phenomenon affects our community because understanding chemical reactions helps us understand cooking, cleaning, medicine, and environmental changes. You'll investigate how scientists use evidence to identify chemical changes in places like ours.
Progress Checkpoint: This is Week 1 of Cycle 2—you're building your chemistry foundation! Next up: Conservation of mass in reactions (Week 2).
Pair-Share: First, think about what happens when things change on your own (1 min). Then share with your partner (2 min). Finally, we'll discuss as a class.
Accessibility & Learning Support
- Need text read aloud? Chrome: Right-click then "Read aloud" | Edge: Click speaker icon in address bar
- Working from home? Look for the HOME ALTERNATIVE boxes at each station
- Need extra support? Click the green "Need help?" buttons for hints and sentence starters
- Stuck? Look for the red "Stuck?" boxes with step-by-step help
NGSS Standards - Foundation Week
This Week: Building Foundation Skills
What it means: This week focuses on learning how to IDENTIFY chemical reactions through observable evidence. We're building the foundation for deeper chemistry concepts in Weeks 2-4.
In student language: I can identify evidence that a chemical reaction has occurred.
Coming Next Week: MS-PS1-2
What it means: Analyze and interpret data on the properties of substances before and after they interact to determine if a chemical reaction has occurred.
In student language: I can analyze data to determine if substances changed during a reaction.
3-Dimensional Learning
| Dimension | What You'll Practice |
|---|---|
| SEP-3 Planning & Carrying Out Investigations | Test household reactions and collect evidence |
| SEP-6 Constructing Explanations | Design a system to detect chemical reactions |
| DCI PS1.B Chemical Reactions | Learn what evidence proves a reaction occurred |
| CCC Cause and Effect | Connect observable evidence to chemical changes |
Success Criteria - How You'll Know You've Got It
Target 1: Identify the four main types of evidence for chemical reactions
Self-check: Can I name and explain GCTP (Gas, Color, Temperature, Precipitate)?
Target 2: Distinguish between chemical and physical changes
Self-check: Can I explain the difference between melting ice (physical) and rusting iron (chemical)?
Target 3: Design tests to detect chemical reactions
Self-check: Can I design an experiment to prove a chemical reaction occurred?
Target 4: Explain how evidence supports claims about chemical changes
Self-check: Can I use evidence to argue whether a change is chemical or physical?
Why This Matters to YOU:
Chemical reactions power cooking (rising dough), medicine (blood clotting), and technology (phone batteries). Identifying reactions using GCTP evidence helps you understand how things work!
The Phenomenon: The Yeast Mystery
Imagine this scenario:
- You mix yeast with warm water and sugar in a bowl
- Within minutes, the mixture starts to bubble and foam
- When you touch the bowl, it feels warm—even though you didn't heat it
- A strong smell fills the air—different from the original ingredients
This is what makes bread rise! But what's actually happening? How do scientists know a CHEMICAL REACTION is occurring?
Focus Question: Why does yeast make bread rise? What evidence tells us a chemical reaction is happening?
Learning Targets
By the end of this week, you will be able to:
Vocabulary
Cognate Strategy: Many science words look similar in English and Spanish — use your Spanish to learn science!
| Term | Spanish | Definition |
|---|---|---|
| chemical reaction | reacción química | A process where substances interact to form new substances |
| evidence | evidencia | Observable signs that prove something happened |
| gas | gas | Bubbles or vapor produced during a reaction |
| precipitate | precipitado | A solid that forms when liquids mix |
| temperature | temperatura | How hot or cold something is |
| color change | cambio de color | When a substance turns a different color |
| physical change | cambio físico | Change in form but same substance (like melting ice) |
| Chemical Reaction | Reacción Química | Proceso donde sustancias interactúan para formar nuevas sustancias / Process where substances interact to form new substances |
| Evidence | — | Evidencia |
| Gas Production | Producción de Gas | Burbujas o vapor producido durante una reacción / Bubbles or vapor produced during a reaction |
| Precipitate | — | Precipitado |
| Temperature Change | — | Cambio de Temperatura |
| Color Change | — | Cambio de Color |
| Physical Change | Cambio Físico | Cambio de forma pero la misma sustancia / Change in form but same substance |
Worked Example
Problem Scenario
Review the problem scenario and work through each step below.
Problem Scenario
Review the problem scenario and work through each step below.
Four Types of Evidence for Chemical Reactions:
| Evidence Type | What to Look For | Example |
|---|---|---|
| Gas Production | Bubbles, fizzing, vapor | Baking soda + vinegar |
| Color Change | New color appears | Iron rusting (turns orange) |
| Temperature Change | Feels warmer or cooler | Hand warmers heat up |
| Precipitate Formation | Solid forms in liquid | Milk curdling |
Memory Trick: GCTP - Gas, Color, Temperature, Precipitate
Step-by-Step Problem Solving
Marie Curie: Using Evidence to Discover New Elements
Marie Curie won TWO Nobel Prizes (Physics 1903, Chemistry 1911) for her work on radioactivity—the first woman to win a Nobel Prize!
The Discovery: Curie noticed pitchblende ore was MORE radioactive than pure uranium. This evidence led her to discover TWO new elements: polonium and radium.
Connection to Grade 7: Just like Curie used observable evidence to discover new elements, you're learning to use observable evidence (GCTP) to identify chemical reactions!
"Nothing in life is to be feared, it is only to be understood." - Marie Curie
Need extra support? Click here for hints and sentence starters
Key Concept Reminder:
- Chemical change: NEW substance formed (cannot easily reverse)
- Physical change: SAME substance, different form (can often reverse)
- Look for GCTP evidence to identify chemical reactions
Sentence Starters:
- "This is a chemical change because I observe..."
- "This is a physical change because the substance is still..."
- "The evidence that proves this is..."
Word Bank:
gas production, color change, temperature change, precipitate, new substance, same molecules, reversible, irreversible
Stuck? Click here for step-by-step help
Try these steps in order:
- Read the scenario carefully
- Ask: "Did a NEW substance form, or is it the SAME substance in a different form?"
- Look for GCTP evidence (gas, color, temperature, precipitate)
- If you see GCTP evidence → probably CHEMICAL
- If it's just changing shape/state → probably PHYSICAL
COMPLETE THE STATION 1 FORM BELOW
Classify 6 scenarios as chemical or physical changes.
[EMBED G7.C2.W1 Station 1 Form Here]
Form ID: ________________
Station 2 - Reaction Explorer
20 Points | ~15 Minutes
Your Mission: Test Reactions and Document Evidence
Three Household Reactions to Analyze:
| Reaction | Materials | What to Observe |
|---|---|---|
| Baking Soda + Vinegar | Sodium bicarbonate + acetic acid | Gas production, temperature change |
| Hydrogen Peroxide + Yeast | H₂O₂ + yeast catalyst | Gas production, temperature change |
| Milk + Lemon Juice | Dairy + citric acid | Precipitate formation, texture change |
Key Investigation Questions:
- Which type(s) of evidence did you observe for each reaction?
- Which reaction showed the MOST evidence? Why does this matter?
- Could you identify a reaction with only ONE type of evidence? Explain.
Need extra support? Click here for hints
Observation Tips:
- Gas: Look for bubbles, fizzing, or foam
- Temperature: Watch for steam or feel the container
- Precipitate: Look for solid chunks forming in liquid
- Color: Compare before and after—did the color change?
Sentence Starters:
- "In the [reaction], I observed [evidence type] because..."
- "The strongest evidence was [type] because..."
- "This proves a chemical reaction occurred because..."
COMPLETE THE STATION 2 FORM BELOW
Analyze reactions and document your evidence observations.
[EMBED G7.C2.W1 Station 2 Form Here]
Form ID: ________________
Station 3 - Design a Detector
25 Points | ~20 Minutes (Highest Value!)
Engineering Challenge: Design a Chemical Reaction Detector
The Challenge:
You are a chemical engineer designing a system to detect whether a chemical reaction is happening in a sealed container. You cannot SEE inside the container, so you must design tests that detect evidence from the OUTSIDE. Your detector must identify at least TWO types of evidence and explain HOW each detection method works.
Example Detection Methods:
| Evidence Type | Detection Method | How It Works |
|---|---|---|
| Gas | Pressure gauge | If gas forms, pressure increases inside container |
| Temperature | Thermometer strip | If reaction releases heat, temperature rises |
| Color | Transparent window | Observer can see color change through window |
| Precipitate | Transparent window + settling time | Solid particles sink to bottom, visible through window |
Design Constraints:
- Must detect at least TWO types of evidence
- Must explain HOW each detection method works
- Must identify ONE limitation of your design
- Be creative—there are many valid approaches!
Need extra support? Click here for design hints
Design Tips:
- Think about what TOOLS could measure each evidence type
- Ask: "How would I know if [evidence] is present without opening the container?"
- Consider combinations: Can one tool detect multiple evidence types?
Sentence Starters:
- "To detect [evidence type], I would use [tool] because..."
- "This method works by measuring/observing..."
- "One limitation of my design is that it cannot detect..."
COMPLETE THE STATION 3 FORM BELOW
Design your reaction detection system and explain your reasoning!
[EMBED G7.C2.W1 Station 3 Form Here]
Form ID: ________________
Exit Ticket - Evidence Integration
23 Points | ~15 Minutes
Show What You Learned
Question Types:
- 4 NEW - Evidence types, chemical vs physical, reaction identification
- 0 SPIRAL - This is Week 1! No review questions yet.
- 1 INTEGRATION - Connect cause (reaction) to effect (evidence)
- 1 SEP-3 - Planning investigations to test for reactions
Remember:
This is your first Exit Ticket for Cycle 2! Starting next week, you'll also have spiral questions that review what you learned in previous weeks.
COMPLETE THE EXIT TICKET BELOW
This is your final assessment for Week 1. Take your time!
[EMBED G7.C2.W1 Exit Ticket Form Here]
Form ID: ________________
Enrichment & Extension
Optional deep dives for early finishers.
Optional content if you finish early or want to go deeper.
Scientist Spotlight
Research a scientist who contributed to this week's topic area and describe their key findings.
Environmental Justice Connection
Explore how this week's science concepts connect to environmental justice issues in our community.