Why do chemists use models for atoms and particles?
They are too dangerous to observe directly.
They are too fast-moving to observe directly.
They are too reactive to handle directly.
They are too small to see directly.
Flashcards for OCR GCSE Chemistry The particle model, covering the key terms, definitions and equations you need to recall for Paper 1 and Paper 2 (Foundation Tier) or Paper 3 and Paper 4 (Higher Tier). 28 cards, matched to the OCR GCSE Chemistry (J248) specification. Recall questions account for roughly 40% of marks at GCSE Chemistry, so these target the marks you can secure before the paper starts.
