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Understanding Chemical Changes and Reaction Types
Mhhv
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1. Signs of Chemical Change Common indicators: 1. Colour change 2. Energy change (heat, light) 3. Gas production 4. Formation of a precipitate 5. Odour change ⸻ 2. Law of Conservation of Mass • Matter cannot be created or destroyed. • Total mass of reactants = total mass of products. • In chemical equations, this is why we balance reactions. ⸻ 3. Predicting Products + Balancing General approach: 1. Identify reaction type. 2. Write expected products using charges/diatomic elements. 3. Add states (based on solubility rules). 4. Balance coefficients last. ⸻ 4. General Formulas for Reaction Types Synthesis: A +
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