Organic chemistry · Grade 9
Starch and iodine
ChemAI · Worksheet
NameClassDate
Aim
Iodine turns blue-black only where starch is present.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add iodine solution to tube 1 (starch). | |
| 2 | Add iodine solution to tube 2 (glucose) and compare. |
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?