Edexcel A Level Chemistry:复习笔记1.8.3 Calorimetry
Calculating Energy Transferred, Q Measuring enthalpy changes Calorimetry is the measurement enthalpy changes in chemical reactions A simple calorimeter can be made from a polystyrene drinkin...
Edexcel A Level Chemistry:复习笔记1.8.2 Enthalpy Level Diagrams
Enthalpy Level Diagrams The total chemical energy inside a substance is called the enthalpy (or heat content) When chemical reactions take place, changes in chemical energy take place and th...
Edexcel A Level Chemistry:复习笔记1.8.1 Enthalpy Changes
Enthalpy Change Definitions To be able to compare the changes in enthalpy between reactions, all thermodynamic measurements are carried out under standard conditions These standard condition...
Edexcel A Level Chemistry:复习笔记1.7.4 Yield & Atom Economy
Yield & Atom Economy Percentage yield In a lot of reactions, not all reactants react to form products which can be due to several factors: Other reactions take place simultaneously The r...
Edexcel A Level Chemistry:复习笔记1.7.3 Error & Uncertainty
Error & Uncertainty An error is the difference between a value or quantity obtained in an experiment and an accepted or literature value for an experiment There are two types of errors i...
Edexcel A Level Chemistry:复习笔记1.7.2 Titrations
Titration Calculations Volumetric Analysis Volumetric analysis is a process that uses the volume and concentration of one chemical reactant (standard solution) to determine the concentration...
Edexcel A Level Chemistry:复习笔记1.7.1 Reacting Volume Calculations
Reacting Volume Calculations Reacting volume calculations are commonly associated with the reactions of gases All gases occupy the same volume under the same conditions At room temperature a...
Edexcel A Level Chemistry:复习笔记1.6.5 Amount of Substance Calculations
Amount of Substance Calculations As previously discussed, the amount of substance can be defined as the number of particles in a substance, n, measured in moles (often abbreviated to mol) In...
Edexcel A Level Chemistry:复习笔记1.6.4 The Mole & the Avogadro Constant
The Mole & Avogadro The Avogadro constant (NA or L) is the number of particles equivalent to the relative atomic mass or molecular mass of a substance The Avogadro constant applies to at...
