First chemistry (grades 7–8) · Grade 7
Which ones dissolve in water?
ChemAI · Worksheet
NameClassDate
Aim
Salt, marble and an oil-like liquid: solution, sediment or two layers?
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Add salt to tube 1 and shake. Can you still see it? | |
| 2 | Add marble chips to tube 2. They sink and stay: they do not dissolve. | |
| 3 | Add hexane to tube 3: it floats as a separate layer, like oil on water. |
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?