Reaction rates · Grade 9
Concentration and rate
ChemAI · Worksheet
NameClassDate
Aim
Marble in concentrated and diluted acid.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add marble chips to tube 1. | |
| 2 | Add marble chips to tube 2. Which measuring tube fills with CO₂ faster? | |
| 3 | Bonus: heat tube 2. What happens to the rate? |
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?