AQA A Level Chemistry复习笔记8.1.8 Finding Ka
Finding Ka The Ka of a weak acid may be determined by finding the pH at the half equivalence point At the half equivalence point Ka = [H+] Key steps in the procedure A pH probe or meter is c...
AQA A Level Chemistry复习笔记8.1.7 Making Simple Cells
Making Simple Cells Simple cells can be used to investigate the effect of different electrode combinations on the EMF produced by an electrochemical cell Key steps in the procedure The metal...
AQA A Level Chemistry复习笔记8.1.6 Determination of Kc
Determination of Kc The determination of an equilibrium constant can be carried out in a school laboratory using an esterification reaction between ethanol and ethanoic acid in the presence ...
AQA A Level Chemistry复习笔记8.1.5 Iodine Clock Reaction
Iodine Clock Reaction Clock reactions are so called because they show a sharp dramatic colour change after a period of time has elapsed They make ideal reactions for studying kinetics Iodine...
AQA A Level Chemistry复习笔记8.1.4 Entropy of Vaporisation
Entropy of Vaporisation The entropy change when water boils can be measured using a kettle and a top pan balance At the boiling point, liquid water and water vapour exist in equilibrium so t...
AQA A Level Chemistry复习笔记8.1.3 Required Practical 9
Required Practical 9 Required Practical 9: Investigating pH changes The experimental set up for measuring pH changes in titrations Steps in the procedure Measure out 50 cm3 of 1.0 mol...
AQA A Level Chemistry复习笔记8.1.2 Required Practical 8
Required Practical 8 Required Practical 8: Measuring the EMF of a cell To measure a cell EMF you will need Two small beakers, around 75 cm3 capacity Strips of suitable metals such as copper,...
AQA A Level Chemistry复习笔记7.11.5 Interpreting Chromatograms
Interpreting Chromatograms The less polar components travel further up the TLC plate Their Rf values are higher than those closer to the baseline They are more soluble in the mobile phase an...
AQA A Level Chemistry复习笔记7.11.4 Gas Chromatography
Gas Chromatography Gas-Liquid Chromatography (GLC) is used for analysing: Gases Volatile liquids Solids in their vapour form The stationary phase: This method uses a long coiled colum...
