Edexcel A Level Chemistry:復習筆記1.8.4 Hess Cycles
Constructing Hess Cycles In 1840, the Russian chemist Germain Hess formulated a law which went on to be known as?Hess’s Law This went on to form the basis of one of the laws of thermodynamics. The ...
Edexcel A Level Chemistry:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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:復習筆記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...
