AL Chemistry Write an essay on factors which affect the rate of reactions and discuss the uses of kinetic studies. p. 1.

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Presentation transcript:

AL Chemistry Write an essay on factors which affect the rate of reactions and discuss the uses of kinetic studies. p. 1

AL Chemistry Write an essay on factors which affect the rate of reactions and discuss the uses of kinetic studies. p. 1

AL Chemistry # Guidelines # 0. Introduction: Kinetics is influenced by many experimental conditions (factors) Part A: Factors affecting Rate of Reaction Part B: Uses of Kinetic Studies p. 2

(a) Collision Theory [velocity, K.E. of molecules] AL Chemistry A1. Temperature (a) Collision Theory [velocity, K.E. of molecules] EA (b) M. B. Distribution (c) Arrhenius eqn. (EA) p. 3

chance of effective collisions  AL Chemistry A2. Concentration concentration  freq. of collisions  chance of effective collisions  p. 4

for reactions involving gases only AL Chemistry A3. Pressure for reactions involving gases only (solid & liquid are not compressible) pressure , no. of eff. collisions  p. 5

(b) new pathway with lower EA AL Chemistry A4. Catalyst (a) definition (b) new pathway with lower EA (c) M. B. Distribution p. 6

 e.g. marble chips VS powdered CaCO3 AL Chemistry A5. Other Factors (a) surface area  state of subdivision  e.g. marble chips VS powdered CaCO3 (b) light  photosynthesis  silver salt & photographic film p. 7

B1. Industry maximum yield minimum raw materials minimal fuel AL Chemistry B1. Industry Optimization of Industrial Production of Chemicals maximum yield minimum raw materials minimal fuel shortest time p. 8

(a) deterioration of food AL Chemistry B2. Society Slow down unwanted reactions (a) deterioration of food (b) rusting p. 9

B3. Archaeological Investigation AL Chemistry B3. Archaeological Investigation Carbon-14 dating of Fossil and Prehistorical Remains (radioactive decay: first order reaction) p. 10

B4. Studying Reaction Mechanism AL Chemistry B4. Studying Reaction Mechanism rate equation  deduce the species involved in r.d.s.  species involved in formation of T.S.  molecularity of reaction  e.g. SN1 or SN2 p. 11