First chemistry (grades 7–8) · Grade 7
Particles on the move
ChemAI · Worksheet
NameClassDate
Aim
One tiny purple crystal colours a whole beaker: the particles spread out by themselves.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add one potassium permanganate crystal to beaker 1 and watch the colour spread. | |
| 2 | Heat beaker 2 to about 50 °C. | |
| 3 | Add a crystal to the warm water too. In warm water the particles move faster, so it spreads faster. |
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?