Water and solutions · Grade 10
Golden rain
ChemAI · Worksheet
NameClassDate
Aim
A yellow precipitate that dissolves when hot and comes back as golden crystals.
⚠ Lead compounds are toxic: gloves, and collect all waste for safe disposal.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add potassium iodide to the lead(II) nitrate solution. | |
| 2 | Heat the tube until the yellow solid disappears (speed ×5). | |
| 3 | Stop heating and let it cool. What do you see? |
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?