| Concept |
Actions (in question form) |
| Chemical reaction |
– Is this change chemical or not? – How to verify it? Have we really obtained a new substance? |
| Substance |
− Are these substances the same or different? – How to prove it?What are their distinctive features?− How to make the new substance “visible” (condensed, crystallized) or “invisible” (dissolved, vaporized, etc.)? |
| Particles of a substance |
− Are these particles the same or different? – How to verify your guess?− Do these particles stay together or move separately? – How to check your statement? |
