Unit 3: Chemical Kinetics. 2.4.1: Factors influencing Reaction Rates. Factors Influencing Reaction Rate :. How can the rate of a chemical reaction be changed? There are four main of factors: Nature of the reactants Temperature Concentration and Pressure Catalysts.
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2.4.1: Factors influencing Reaction Rates
1.The phase of the reacting particles is important. Reactants in solution, liquids, and gases will react much faster than solids.
2. Closely related to phase is the exposed surface area of the reacting particles. More surface area= faster reaction.
3.Reactions involving covalently-bonded molecules tend to be slow.
H2O2(l) → H2(g) + O2(g)
4.Stirringis another factor that increases the rate of a reaction. Stirring causes the particles to collide more frequently since they will come into contact with one another more frequently.
2 KClO3 (s) → 2 KCl (s) + 3 O2(g)
2 N2O → 2 N2 + O2