The periodic table · Grade 9
Alkali metals and water
ChemAI · Worksheet
NameClassDate
Aim
Lithium, sodium and potassium: how does reactivity change down Group 1?
⚠ Only tiny pieces, behind a safety screen, with goggles. Never touch alkali metals.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add lithium to beaker 1. | |
| 2 | Add sodium to beaker 2. | |
| 3 | Add potassium to beaker 3. | |
| 4 | Test the gas from beaker 1 with a burning splint. Why is each solution pink? |
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?