Identifying substances · Grade 10
Mystery solutions
ChemAI · Worksheet
NameClassDate
Aim
A, B and C are a carbonate, an iodide and an ammonium salt. Which is which?
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Plan: acid → fizzing? Silver nitrate → coloured precipitate? NaOH + heat → ammonia? Start testing. | |
| 2 | Identify A (an iodide gives a yellow precipitate). | |
| 3 | Identify B (ammonium: NaOH, warm, damp red litmus). | |
| 4 | Identify C (carbonate: acid, then limewater). |
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?