IB DP Chemistry: HL复习笔记6.1.4 Activation Energy
Activation Energy For a reaction to take place, the reactant particles need to overcome a minimum amount of energy This energy is called the activation energy (Ea) In exothermic reactions the react...
IB DP Chemistry: HL复习笔记6.1.3 Measuring Rates
Measuring Rates To measure the rate of a reaction, we need to be able to measure either how quickly the reactants are used up or how quickly the products are formed The method used for measuring de...
IB DP Chemistry: HL复习笔记6.1.2 Rate of Reaction
Rate of Reaction Reaction rate Some reactions take place instantly, but most are much slower and it is possible to measure how long these reactions take to reach a certain stage As a chemical react...
IB DP Chemistry: HL复习笔记6.1.1 Collision Theory
Kinetic Theory The kinetic theory developed in the 18th century out of a need to explain how it is that gases exert pressure inside a container Theories about gas particles and movement were extend...
IB DP Chemistry: HL复习笔记5.3.4 Case Study: Ozone
Case study: Ozone & Bond Strength A study of bond enthalpy can explain why ozone and oxygen in the atmosphere play very different roles in the flow of energy These processes have a profound eff...
IB DP Chemistry: HL复习笔记5.3.3 Energy Profiles
Energy Profiles An energy profile or energy level diagram is a diagram that shows the energies of the reactants, the transition state(s) and the products of the reaction with time The transition st...
IB DP Chemistry: HL复习笔记5.3.2 Bond Enthalpy Calculations
Bond Enthalpy Calculations Bond energies are used to find the ΔHrꝋ of a reaction when this cannot be done experimentally The process is a step-by-step summation of the bond enthalpies of the all th...
IB DP Chemistry: HL复习笔记5.3.1 Bond Enthalpy
Bonds & Energy When bonds are broken or made enthalpy changes take place A chemical bond is a force of attraction between two atoms Breaking the bond requires the input of energy it is therefor...
IB DP Chemistry: HL复习笔记5.2.4 Using ∆Hf° to Find Enthalpy Changes
Using ∆Hf° to Find Enthalpy Changes Standard Enthalpy of Formation is defined as “The enthalpy change when one mole of a compound is formed from its elements under standard conditions” We can use e...
