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...
CollegeBoard发布SAT机考样题，正式回应黄牛考位问题
今天，CollegeBoard正式放出了SAT机考样题，并采取直播方式对机考模式进行讲解，同时，首次正面回应了黄牛考位问题。 在今年1月份，CB宣布SAT进入机考时代，国际考场在2023年春季率先使用机考，自此，SAT机考正式...
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...
AQA A Level Chemistry复习笔记5.4.5 Lithium Cells
Lithium Cells Lithium ion cells power the laptop or mobile device you are probably reading this on The Noble Prize for Chemistry in 2019 was awarded to John B. Goodenough, M. Stanley Whittin...
AQA A Level Chemistry复习笔记5.4.4 Commercial Cells
Commercial Cells Electrochemical cells can be used as a commercial source of electrical energy Cells can be non-rechargeable (irreversible), rechargeable or fuel cells Type of cells used in ...
AQA A Level Chemistry复习笔记5.4.3 Predicting Reactions
Predicting Reactions Direction of electron flow The direction of electron flow can be determined by comparing the Eꝋ values of two half-cells in an electrochemical cell Cl2 (g) + 2e- ⇌ 2Cl- ...
AQA A Level Chemistry复习笔记5.4.2 Standard Electrode Potentials
Standard Electrode Potentials Standard electrode potential The position of equilibrium and therefore the electrode potential depends on factors such as: Temperature Pressure of gases Concent...
AQA A Level Chemistry复习笔记5.3.3 Changes in Temperature & Pressure
Changes in Temperature & Pressure We can apply Le Chatelier's Principle to gaseous equilibria in the same way it is applied to aqueous systems Here's a reminder of how the principle work...
AQA A Level Chemistry复习笔记5.3.2 Partial Pressure
Partial Pressure The partial pressure of a gas is the pressure it exerts in a mixture of gases if it occupied the container on its own Partial pressure is given the symbol p, so for a gas X,...
