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，小编一起来和大家分享下。 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...
AQA A Level Chemistry复习笔记2.1.4 Trends of Period 3 Elements: Melting Point
Trend: Melting Point Melting points of the elements across period 3 A pattern is a little harder to see from the data, but you can see that it rises and falls: Melting points of the period 3...
AQA A Level Chemistry复习笔记2.1.3 Trends of Period 3 Elements: First Ionisation Energy
Trend: First Ionisation Energy The first ionisation energy (IE1) is the energy required to remove one mole of electrons from one mole of atoms of an element in the gaseous state to form one ...
AQA A Level Chemistry复习笔记2.1.2 Trends of Period 3 Elements: Atomic Radius
Trend: Atomic Radius Elements in the periodic table are arranged in order of increasing atomic number and placed in vertical columns (groups) and horizontal rows (periods) The elements acros...
AQA A Level Chemistry复习笔记1.9.3 Redox Equations
Balancing Redox Reactions Balancing equations using redox principles is a useful skill and is best illustrated by following an example It is important to follow a methodical step-by-step app...
AQA A Level Chemistry复习笔记1.9.2 Oxidation States: The Rules
Oxidation States Oxidation State Rules A few simple rules help guide you through the process of determining the oxidation state of any element Remember, you are determining the oxidation sta...
AQA A Level Chemistry复习笔记1.8.5 Changes Which Affect the Equilibrium
Changes Affecting the Equilibrium Constant Changes in concentration If all other conditions stay the same, the equilibrium constant Kc is not affected by any changes in concentration of the ...
AQA A Level Chemistry复习笔记1.8.4 Calculations Involving the Equilibrium Constant
Kc Calculations Calculations involving Kc In the equilibrium expression each figure within a square bracket represents the concentration in mol dm-3 The units of Kc therefore depend on the f...
AQA A Level Chemistry复习笔记1.8.3 The Equilibrium Constant, Kc
The Equilibrium Constant, Kc Equilibrium expression & constant The equilibrium expression links the equilibrium constant, Kc, to the concentrations of reactants and products at equilibri...
