Dairy Detective Worksheet
Dairy Detective Log
Case File: The Great Fat Race
3rd Grade Science Division
Detective Name:
Date:
My Prediction
We are going to shake three different liquids: Heavy Cream, Whole Milk, and Skim Milk. Which one do you think will turn into butter?
The Great Fat Race: Observation Table
| Liquid Type | What I Saw & Heard | Butter Made? |
|---|
| Heavy Cream | | |
| Check if Yes | | |
| Whole Milk | | |
Check if Yes |
| Skim Milk | |
Check if Yes |
Case Conclusion
To make butter, a liquid must have enough because
Microscopic View: Fat Globules Sticking Together
Draw the fat molecules bumping and sticking!
The Great Fat Race Slides
The Great
Fat Race
Dairy Science Expedition
Butter Lab
Grade 3
The Big Question
"Jessi used Heavy Cream to make her butter. Squeaks is wondering..."
Would this work with regular milk?
What about skim milk?
Turn and talk to your science partner!
Science Investigation
SciShow Kids
Embedded media
Watch carefully: 1:20 – 1:40 (Fat Content)
Experimental Setup
🥛
Heavy Cream
Group A
🥛
Whole Milk
Group B
🥛
Skim Milk
Group C
Shake Time: 15 Minutes
Don't stop until you feel the lump!
Why did it happen?
Fat Globules
Heavy cream has LOTS of tiny fat bits (globules).
When we shake, they bump into each other and stick together!
Fat
Fat
Fat
STUCK!
Case Conclusion
To make butter, a liquid must have enough
FAT
because those fat bits need to find each other and stick together!
Great Job, Dairy Detectives!
Butter Lab Facilitator Guide
Butter Lab
Facilitator Guide
Grade: 3
Subject: Science (Matter/Mixtures)
Duration: 45 Minutes
Learning Objectives
- Identify fat content as the key variable in butter production.
- Observe and record physical changes in states of matter.
- Explain the mechanism of agitation (shaking) on fat globules.
Materials Needed
- • Heavy Cream
- • Whole Milk
- • Skim Milk
- • Mason Jars (Small)
- • Timers
- • Worksheet
Lesson Flow
5m
The Hook: Jessi's Mystery
Slide 2
Present the scenario: Jessi used heavy cream. Ask: "Would this work with regular milk? What about skim milk?" Have students record their initial predictions on the Dairy Detective Worksheet.
5m
Investigation Video
Slide 3
Watch "Let's Make Butter!" Focus on 1:20-1:40.
Discussion Anchor (1:42):
"What makes the fat stick together?" (Agitation/Force/Bumping into each other).
25m
The Great Fat Race (Activity)
Slide 4
Divide class into three groups (or give each group all 3 jars if resources allow):
- Group A: Heavy Cream (Control)
- Group B: Whole Milk (~3.25% fat)
- Group C: Skim Milk (0% fat)
Key Instruction: All groups must shake for exactly 15 minutes.
10m
Closure & Analysis
Slide 5-6
Only the heavy cream will yield a solid lump. Discuss why. (Whole milk has fat, but it is too diluted for the globules to find each other easily in 15 mins).
Expected Conclusion Statement:
"To make butter, a liquid must have enough fat because the fat bits need to bump into each other and stick together to form a solid."
Teacher Tips & Troubleshooting
Common Misconception
Students often think butter is just "frozen" or "thickened" milk. Emphasize that it is a separation of fat from liquid.
Pro-Tip
Room temperature cream turns to butter faster than cold cream! Take the cream out of the fridge 30 mins before the lesson.
