First chemistry (grades 7–8) · Grade 8
Firework colours
ChemAI · Worksheet
NameClassDate
Aim
Metal salts give flames their colours — that is how fireworks are coloured.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Open “Tests” on tube 1 and choose “Flame test”: lithium burns red. | |
| 2 | Clean the wire, then test tubes 2 and 3: sodium is yellow-orange, copper is blue-green. |
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?