Rainbow Reaction Slides
RAINBOW
REACTION
Science Club: Acids & Bases
Chemistry has Colors!
Did you know that some liquids can change color like magic?
The Litmus Scale
ACID NEUTRAL BASE
"If I drop something acidic on special paper, what color do you expect to see?"
Watch the Lab
Pay attention to YOUR substance!
Embedded media
Window Cleaner
Lemon Juice
Vinegar
Baking Soda
Lab Report
1
Acids
Turn litmus paper RED or ORANGE. Often taste sour!
2
Bases
Turn litmus paper BLUE or GREEN. Often feel slippery!
Science Secret:
"Vinegar is clear like water, but it's an ACID. Not all clear liquids are just water!"
THE pH WALL
Collaborative Art & Science Project
DRAW
Draw your beaker and color the liquid inside.
CREATE
Cut and color a giant litmus strip (Red or Blue/Green).
POST
Tape your work under the "Acid" or "Base" wall header.
Show & Tell
Share your substance with the club!
"Why did you put it on that side of the wall?"
Final Photo Next!
Rainbow Reaction Teacher Guide
Teacher Facilitation Guide
Rainbow Reaction: pH Wall Experiment
ELEMENTARY SCIENCE CLUB
Lesson Objective
Students will explore the chemical properties of everyday household substances by observing litmus paper reactions. They will collaborate to create a visual "pH Rainbow" classification wall, successfully identifying substances as either acids or bases.
Prep Checklist
- Large Poster Paper
- Colorful Markers
- Tape & Scissors
- Printed Wall Headers
Pacing & Facilitation
5 MIN
The Hook: Mystery Colors
Display the title slide and the Litmus Scale. Ask: "Can a liquid change the color of paper just by touching it?"
"We're going to use special 'Litmus Paper' today. It's like a secret decoder for chemistry!"
10 MIN
Virtual Lab: Observation
Assign groups to watch for specific substances: Window Cleaner, Lemon Juice, Vinegar, or Baking Soda.
Pause at 1:35
Compare Vinegar vs Lemon Juice. Why did they both turn red? (They are both acids).
Pause at 2:00
Ask: "Why do scientists write down their results right away?" (To ensure data accuracy).
20 MIN
Activity: The pH Wall
Groups create their display components using poster paper and markers.
- The Beaker: Draw a large beaker with the correct liquid color.
- The Strip: Cut a long rectangle of paper. Color it to match the litmus result from the video.
- Classification: Label the work "ACID" or "BASE" in bold letters.
10 MIN
Presentation & Gallery Walk
Groups tape their posters under the correct wall headers. Conduct a brief presentation where each group explains their "Evidence" (the color change).
Safety Note
While we are watching a video experiment today, remind students that in a real lab, they must always wear goggles and gloves, even when testing "everyday" items like cleaners.
Common Misconception
Students often think only bright colors or "chemicals" are acids. Emphasize that Vinegar is clear like water but is actually a strong acid!
pH Scientist Worksheet
Lab Observation Log
Scientist Name:
Experiment Date:
THE RAINBOW REACTION
Part 1: Video Observations
Watch the video carefully. When you see your group's substance, color the beaker and the test strip to match!
Window Cleaner
Strip Color
ACID
BASE
Lemon Juice
Strip Color
ACID
BASE
Vinegar
Strip Color
ACID
BASE
Baking Soda
Strip Color
ACID
BASE
Part 2: Poster Plan
Sketch how you want your large group poster to look. Remember to include your Beaker, your Litmus Strip, and the Label!
