A-Level经济学主要学习内容，应该如何冲刺A*？
A-Level经济学Economics是A-Level最受学生欢迎的科目之一，但是很多学生认为A-Level经济学的学习难度较大、高分率低，“不选不行，选了痛苦”成为了很多选择A-Level经济学学生的写照。 A-Level经济学主要学习内容 ...
A-level重考影响申请英国G5吗？
今年的A-level大考结束了，包括国际考试局和英国本土。然而今年的形势，小编也给大家说了，英国打算削减A-level高分6万个，今年上万人将无缘大学录取！考试发挥失利，或成绩不错但报空了的同学，怎么办？这就引出...
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...
