Change Detectives Slides
CASE FILE: #05-MATTER
GRADE 5 INVESTIGATION
Change Detectives
Uncovering the Clues of Physical & Chemical Changes
CLASSIFIED RESOURCE
Property of Change Detectives Lab HQ
MISSION BRIEFING
Tap space/arrow keys to proceed
THE BRIEFING: What is Matter?
CASE STEP 01
Core Knowledge
Everything around you is made of Matter.
Matter can change its form or turn into completely new things. Our job as detectives is to find out how it changed!
Two Ways Matter Transforms:
1. Physical Change
The substance shifts, but it is still the same material inside! (e.g., tearing paper, melting ice)
2. Chemical Change
The substance transforms into a brand new material. No turning back! (e.g., burning wood, baking a cake)
Detective Challenge: Can you un-bake a cookie? What about un-crumple paper?
Discuss as a class
CASE FILE #1: Physical Changes
THE SHAPESHIFTER
🔎 Spotting the Clues
In a physical change, the atoms don't rearrange to make anything new. The substance just changes how it looks!
- Change of State: Melting ice, freezing water, boiling soup
- Change of Shape: Crumpling foil, carving wood, breaking glass
- Dissolving: Stirring salt or sugar into warm water
Key Evidence: The molecules remain identical before and after!
Ex A: Melting Ice Phase Shift
Solid water (ice) becomes liquid water. It is still H₂O molecules, just warmer and moving faster!
Ex B: Ripping Paper Shape Shift
Tearing a sheet of notebook paper into tiny bits doesn't turn it into cardboard or plastic. It's still wood pulp paper!
CHANGE DETECTIVES MANUAL PAGE 3 OF 7
CASE FILE #2: Chemical Changes
THE TRANSFORMER
Ex A: Rusting Iron New Color & Texture
Iron reacts with oxygen in air/water to make iron oxide (rust). It is flaky, weak, and a totally new orange-brown color!
Ex B: Baking Cake Heat & Gas Shift
Mixing ingredients and heating causes baking powder to bubble, eggs to harden, and sugar to caramelize. New smells and spongy textures are born!
💥 The 5 Smoking Gun Clues
If you spot one of these indicators during an experiment, you are witnessing a chemical reaction!
Unexpected Color Change
Gas Created (Bubbles/Fumes)
Temperature Change
Light or Fire Released
Odor/Smell Change (like spoiled milk)
Key Evidence: You cannot easily reverse a chemical change!
CHANGE DETECTIVES MANUAL PAGE 4 OF 7
DETECTIVE TRAINING: Spot the Clues!
PRACTICE ROUND
A
The Campfire Sparks
Logs turn to black ash, emitting smoke, heat, and bright orange light.
What is it? Chemical (Light, Heat, Ash)
B
The Glass Shatters
A heavy marble drops onto a glass bottle, breaking it into small sharp pieces.
What is it? Physical (Shape Change Only)
C
The Alka-Seltzer Plop
An antacid tablet drops into water and immediately fizzes with thousands of white gas bubbles.
What is it? Chemical (Gas Production)
D
The Lemonade Mix
Yellow powder drink mix is stirred into cold tap water until it completely dissolves.
What is it? Physical (Dissolving / Mix)
Instructors: Have students vote on each scenario (A, B, C, D) using physical signals like thumbs up for chemical, thumbs down for physical!
THE INVESTIGATION: Lab Rules
GETTING HANDS-ON
Lab Sheet Protocol
You are about to run 4 hands-on tests at your lab stations. You must act like a true scientist!
- Observe BEFORE, DURING, and AFTER.
- Fill out your Change Detectives Lab Sheet.
- Never taste substances. Waft to smell.
Your Lab Missions:
1
Station 1: The Crumpled Foil & Torn Paper
2
Station 2: The Melting Ice Cup
3
Station 3: The Fizzy Volcano (Soda & Vinegar)
4
Station 4: Yeast & Sugar Warm Up
Pick up your pencils and prepare your magnifying glasses!
DEBRIEFING: Case Closed!
REFLECT & DEPART
Final Case Discussions:
If liquid water boils and turns into steam (bubbles), is it a chemical or physical change? Hint: What are those bubbles made of?
Why is physical change usually reversible, but a chemical change is irreversible? Give an example of each.
📋 Next Mission
Make sure to wrap up your assignments before completing the lesson:
- Turn in Lab Observations Sheet
- Complete exit ticket questions
- Clean up your lab station!
GREAT WORK, DETECTIVES!
CHANGE DETECTIVES HQ MISSION ACCOMPLISHED
Change Detectives Lab Sheet
Change Detectives
Official Crime Scene Lab Report
DETECTIVE:
DATE:
Your Assignment:
Visit each lab station. Observe carefully before, during, and after. Write down your sensory observations, identify the type of change, and list the clues that prove your case!
1
STATION 1: The Crumpled Foil & Torn Paper
Test Material: Foil & Paper
🔍 Observations (What changed? Size? Shape?):
🌱 Reversibility (Can we turn it back? How?):
🔬 Final Verdict:
Physical Change Chemical Change
🚨 Key Evidence/Clues to support your case:
2
STATION 2: The Melting Ice Cup
Test Material: Solid Ice
🔍 Observations (What happened as it sat there?):
🌱 Reversibility (Can we turn it back? How?):
🔬 Final Verdict:
Physical Change Chemical Change
🚨 Key Evidence/Clues to support your case:
CHANGE DETECTIVES ACADEMY PAGE 1 OF 2
Change Detectives HQ STAGE 2: CRITICAL CLUES
3
STATION 3: The Fizzy Volcano (Soda & Vinegar)
Test Material: Baking Soda & Vinegar
🔍 Observations (Look/Listen closely as they mix):
🌱 Reversibility (Can we separate them back?):
🔬 Final Verdict:
Physical Change Chemical Change
🚨 Key Evidence/Clues to support your case:
4
STATION 4: Yeast & Sugar Warm Up
Test Material: Yeast, Sugar & Warm Water
🔍 Observations (Look for bubbles/changes over 5 mins):
👃 Smell / Temperature (Gently smell, touch cup outside):
🔬 Final Verdict:
Physical Change Chemical Change
🚨 Key Evidence/Clues to support your case:
The Detective's Final Rule of Thumb:
How can you easily explain to another recruit the difference between a physical change and a chemical change? What is the absolute most reliable clue that you've discovered?
CHANGE DETECTIVES ACADEMY PAGE 2 OF 2
Change Detectives Teacher Guide
Change Detectives
Facilitation Guide & Teacher Resources
TEACHER-FACING
Target Grade 5th Grade Science
Total Duration 60 Minutes
Instructional Type Hands-on Investigation
Suggested Lesson Timeline (60 Mins)
| Pacing | Stage | Teacher Directive & Student Tasks |
|---|
| 10 Mins | Mission Briefing | Present introductory slides. Review basic terminology of matter and prime students to identify "Shapeshifter" vs. "Transformer" clues. |
| 30 Mins | Station Investigation | Divide class into partners or small groups. Rotate through Stations 1-4. Students run experiments and record notes in their Lab Sheets. |
| 15 Mins | Case Debriefing | Bring students together. Review results as a group. Discuss tricky observations (e.g., bubbles in boiling water vs. chemical gas). |
| 5 Mins | Exit Ticket | Assign student reflection on the "Master Deduction" summary field of the Lab Sheet for formal assessment. |
🛠️ Station Materials & Prep Guide
1 Station 1 (Physical)
Materials: Aluminum foil sheets, printer paper, safety scissors.
Setup: Lay out sheets on desk with scissors. Put bin nearby for waste.
2 Station 2 (Physical)
Materials: Plastic cups, ice cubes, thermometer, timer.
Setup: Place cups of ice on station desk. Instruct students to time melting speeds.
3 Station 3 (Chemical)
Materials: Baking soda, white vinegar, clear plastic cups, small spoons.
Setup: Keep spoons dry. Measure out baking soda in small dish, vinegar in squeeze bottles.
4 Station 4 (Chemical)
Materials: Dry yeast packets, sugar, warm water (~105°F), clear cups.
Setup: Fill warm water thermoses. Instruct students to mix 1 tsp yeast, 1 tsp sugar, and warm water.
Common Misconceptions to Address
- "Bubbles always mean chemical change": Clarify that boiling water bubbles are just physical shifts (gaseous water), whereas baking soda gas is a brand-new chemical compound.
- "Dissolving means chemical disappearance": Remind students that sugar stirring into water is still there; if the water evaporates, the dry sugar recrystallizes (physical).
