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Many notes say “acid + metal → salt + hydrogen” for all metals. Wrong! Nitric acid (HNO₃) with metals produces NO₂ or NO, not H₂.
For the first 20 elements (which Form 3 focuses on): Form 3 Chemistry Notes Hk Fixed
Searching for pre-made notes is a great start, but the act of creating notes is what secures the grade. Here is how to synthesize the information above into Many notes say “acid + metal → salt
| Type of Salt | Preparation Method | Example | | :--- | :--- | :--- | | Soluble salt (not Na/K) | Acid + Excess metal / insoluble base | H₂SO₄ + CuO → CuSO₄ + H₂O | | Soluble salt (Na/K only) | Acid + Alkali (titration) | HCl + NaOH → NaCl + H₂O | | Insoluble salt | Precipitation (double decomposition) | AgNO₃ + NaCl → AgCl↓ + NaNO₃ | For the first 20 elements (which Form 3