Kinetics common mistakes

Common mistakes

• Confusing activation energy with overall energy change

  Students often confuse activation energy with the enthalpy change of the reaction.

  Fix itActivation energy is the energy barrier that must be overcome for a reaction to proceed, while the enthalpy change is the difference in energy between reactants and products.

• Confusing activation energy with overall energy change

  Students often confuse activation energy with the overall enthalpy change of the reaction.

  Fix itRemember that activation energy is the energy needed to start the reaction, while the overall energy change is the difference between the energy of products and reactants.

• Confusing activation energy with enthalpy change

  Students often confuse the activation energy (Ea) with the overall enthalpy change (ΔH) of the reaction.

  Fix itRemember that activation energy is the energy barrier that must be overcome for the reaction to proceed, while ΔH is the difference in energy between reactants and products.

• Confusing average speed with most probable speed

  Students often confuse the average speed of gas molecules with the most probable speed, which is the speed at the peak of the Maxwell-Boltzmann distribution.

  Fix itRemember that the average speed is calculated from all molecules, while the most probable speed refers to the speed of the maximum number of molecules.

• Confusing activation energy with enthalpy change

  Students often confuse activation energy (Ea) with the overall enthalpy change (ΔH) of a reaction.

  Fix itRemember that activation energy is the energy required to initiate a reaction, while ΔH is the energy change during the reaction.

• Confusing Activation Energy with Enthalpy

  Students often confuse activation energy with the overall enthalpy change of a reaction.

  Fix itRemember that activation energy is the energy barrier that must be overcome for a reaction to proceed, while enthalpy change is the difference in energy between reactants and products.

• Confusing Activation Energy with Total Energy

  Students often confuse activation energy with the total energy of the system.

  Fix itRemember that activation energy is the energy needed to start a reaction, not the total energy of the reactants.

• Confusing concentration with rate constant

  Students often confuse the effect of concentration on reaction rate with the rate constant, thinking they are the same.

  Fix itRemember that concentration affects the rate of reaction, while the rate constant (k) is specific to the reaction at a given temperature and does not change with concentration.

• Confusing pressure with temperature effects

  Students often confuse the effects of pressure with those of temperature on reaction rates.

  Fix itRemember that increasing pressure increases concentration and collision frequency, while increasing temperature increases kinetic energy and collision energy.

• Confusing catalysts with reactants

  Students often think that catalysts are consumed in the reaction.

  Fix itRemember that catalysts are not consumed and can be reused in multiple reaction cycles.