AQA A Level Chemistry复习笔记6.1.3 Melting Point Trend
Melting Point Trend The melting points of the oxides vary significantly across Period 3 and show a clear trend Melting point is a clear indication of the forces of attraction which exist bet...
AQA A Level Chemistry复习笔记6.1.2 Reaction with Oxygen
Reaction with Oxygen Oxide Formation The period 3 elements, excluding chlorine and argon, combine with oxygen to form oxides The oxide formed will contain the elements in their highest oxida...
AQA A Level Chemistry复习笔记5.6.5 Buffers
Acid & Basic Buffers A buffer solution is a solution which resists changes in pH when small amounts of acids or alkalis are added A buffer solution is used to keep the pH almost constant...
AQA A Level Chemistry复习笔记5.6.4 pH Curves
pH Curves During a titration a pH meter can be used and a pH curve plotted A pH curve is a graph showing how the pH of a solution changes as the acid (or base) is added The result is charact...
AQA A Level Chemistry复习笔记5.6.3 Titrations
Titrations Volumetric analysis is a process that uses the volume and concentration of one chemical reactant (a standard solution) to determine the concentration of another unknown solution T...
AQA A Level Chemistry复习笔记5.6.2 pKₐ
pKₐ The range of values of Ka is very large and for weak acids, the values themselves are very small numbers Table of Ka values For this reason it is easier to work with another term ...
AQA A Level Chemistry复习笔记5.5.3 The Ionic Product of Water
The Ionic Product of Water In all aqueous solutions, an equilibrium exists in water where a few water molecules dissociate into protons and hydroxide ions We can derive an equilibrium consta...
AQA A Level Chemistry复习笔记5.5.2 pH & [H⁺]
pH & [H⁺] The acidity of an aqueous solution depends on the number of H+ (H3O+) ions in solution The pH is defined as: pH = -log[H+] where [H+] is the concentration of hydrogen ions in m...
AQA A Level Chemistry复习笔记5.4.6 Fuel Cells
Fuel Cells A fuel cell is an electrochemical cell in which a fuel donates electrons at one electrode and oxygen gains electrons at the other electrode These cells are becoming more common in...
