Organic chemistry · Grade 10
Chemical traffic light
ChemAI · Worksheet
NameClassDate
Aim
Green, red, yellow — and green again when you shake it.
⚠ Sodium hydroxide is corrosive: goggles and gloves.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add indigo carmine to the alkaline glucose solution and watch. | |
| 2 | Wait until it turns yellow (speed ×5 helps). | |
| 3 | Press “Shake”. Why does it turn green again? |
Questions
- Write a word or symbol equation for one reaction you observed.
- Explain your most important observation using particles, ions or energy.
- Was your prediction right? What would you change to get a more reliable result?