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4u c6.02 Factors Affect Rate of Reaction

4u c6.02 Factors Affect Rate of Reaction - Factors that...

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Factors that Affect the Rate of Reaction SCH 4U 1. Nature of Reactants 2. Concentration/ Pressure 3. Temperature 4. Catalyst 5. Surface Area 1. Nature of Reactants a) Phase: e.g. A (s) , A (l) , A (g) molecules/ atoms in gas phase reacts faster than in liquid phase; molecules/ atoms in liquid phase reacts faster than in solid phase. - This is because molecules in the gas phase has the highest E k , follow by that in the liquid phase and the solid phase respectively. b) Atomic or Molecular Structure 2Li (s) + H 2 O (l) Æ LiOH (aq) + H 2 (g) Æ Slowest 2Na (s) + H 2 O (l) Æ NaOH (aq) + H 2 (g) 2K (s) + H 2 O (l) Æ KOH (aq) + H 2 (g) Æ Fastest Potassium has the highest atomic radius so the valence electrons are furthest away from the nucleus and become more reactive. c) Type of Reaction homogenous – reactants are in the same physical state. – solid state: rarely occur. Both reactants in solid state are usually not reactive. – gaseous state: molecular compounds.
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