AQA A Level Chemistry复习笔记8.2.2 Testing Period 3 Oxides
Testing Period 3 Oxides Forming Period 3 Oxides Period 3 elements from sodium to sulfur react with oxygen, forming an oxide with the period 3 element in its highest possible oxidation state ...
AQA A Level Chemistry复习笔记8.1.10 Making Buffers
Making Buffers Buffers can be made by a direct or indirect method The direct method involves measuring out the exact quantities needed of a solution of a weak acid and its salt The indirect ...
AQA A Level Chemistry复习笔记8.1.9 Titration Curves
Titration Curves Titration or pH curves are obtained by reacting known concentrations of acid with alkalis and measuring the pH during the neutralisation A suitable selection to use would be...
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...
