Rocks and metals · Grade 9
Marble and acid: CO₂
ChemAI · Worksheet
NameClassDate
Aim
Marble (limestone) and acid make a gas. Prove it is carbon dioxide with two tests.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add marble chips to the acid. | |
| 2 | Test the gas with a burning splint. | |
| 3 | Confirm with the limewater test. |
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?