Chemical Kinetics

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Chemical Kinetics by Mind Map: Chemical Kinetics

1. 6.1 Collision Theory

1.1. For the chemical reaction to happen:

1.1.1. 1. Reactant particles must collide with each other

1.1.2. 2. The particles must have enough energy for them to react

1.2. The frequency of collision is affected by the factors like:

1.2.1. 1. Temperature

1.2.2. 2. Surface area of the reactants

1.2.3. 3. Concentration

1.3. The trigger the reaction, the minimum energy needed for collision called Activation energy. And the rates is different for different reactions.

2. Rates of reaction

2.1. Ways to measure the rates of reaction

2.1.1. a. Measuring mass: the change of mass could be tracked during the reaction, the method is useful when the gas is released out of the container.

2.1.2. b. Measuring volume:

2.2. The greater the frequency of successful collisions. The greater the rate of reaction. the factors that will affect the rate of reaction:

2.2.1. a. pressure and the concentration: If the pressure or the concentration of the gases are increase: the reactant particles are closer together

2.2.2. the frequency of collisions between reactant particles increases

2.2.3. b. If the surface area to volume ratio of a reacting solid is increased:

2.2.4. More reactant particles are exposed at the surface. And the frequency of collisions between reactant particles increases

2.3. Temperature

2.3.1. a. If the temperature of the reaction is increased,reactantparticles move more quickly

2.3.2. the energy of the particles increases.

2.3.3. the frequency of successful collisions between reactant particles increases.

2.3.4. b. the mean energy of the collisions changes when the temperature changes.

2.4. Catalyst:

2.4.1. A catalyst s the substance that speeds up the rate of a reaction.

2.4.2. does not alter the products of the reaction.

2.4.3. is unchanged chemically and in mass at the end of the reaction.

2.4.4. Catalysts only affect the rate of reaction - they do not affect the yield of the reaction.

2.4.5. A catalyst provides an alternative reaction pathway that has a lower activation energy than the uncatalysed reaction.

2.4.6. Enzymes: An enzyme is a biological catalyst. Enzymes are important for controlling reactions in cells.