First chemistry (grades 7–8) · Grade 8
Fizz! Which gas is it?
ChemAI · Worksheet
NameClassDate
Aim
Marble and acid make a gas. The limewater test tells you it is carbon dioxide.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add marble chips to the acid. What do you see? | |
| 2 | Open “Tests” and bubble the gas through limewater: it turns milky — carbon dioxide! |
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?