AQA A Level Chemistry复习笔记3.1.1 Functional Groups
Organic Definitions & Terminology Organic chemistry is the chemistry of carbon compounds Carbon forms a vast number of compounds because it can form strong covalent bonds with itself This enabl...
AQA A Level Chemistry复习笔记2.3.1 Physical Properties of Group 7
Group 7: Physical Properties The group 7 elements are called halogens The halogens have uses in water purification and as bleaching agents (chlorine), as flame-retardants and fire extinguish...
AQA A Level Chemistry复习笔记2.2.1 Trends in Group 2: The Alkaline Earth Metals
Group 2: Trends Chemical trends All elements in Group 2 (also called alkali earth metals) have two electrons in their outermost principal quantum shell All Group 2 metals can form ionic compounds i...
AQA A Level Chemistry复习笔记2.1.1 Classification of an Element
The Periodic Table: Structure & Classification The periodic table is a list of all known elements arranged in order of increasing atomic number, from 1 to 118. In addition to this, the elements...
AQA A Level Chemistry复习笔记1.9.1 Oxidation & Reduction
Oxidation & Reduction There are three definitions of oxidation and reduction used in different branches of chemistry Oxidation and reduction can be used to describe any of the following proces...
AQA A Level Chemistry复习笔记1.8.1 Chemical Equilibria
Reversible Reactions & Dynamic Equilibrium Reversible reaction Some reactions go to completion where the reactants are used up to form the products and the reaction stops when all of the reacta...
AQA A Level Chemistry复习笔记1.7.1 Collision Theory
Collision Theory Collision theory The collision theory states that for a chemical reaction to take place the particles need to collide with each other in the correct orientation and with enough ene...
英国私立寄宿学校解读！
英国教育可以分两个系统：公立教育和私立教育。这两种教育主要区别在于， 公立教育系统里学校的财政开支和管理由中央政府或者当地政府进行管控。大部分公立学校为走读学校， 全英共有39所公立寄宿制学校， 但这些...
2022-23USACO美国计算机奥赛备赛开启，附历年真题示例
USACO 美国计算机奥林匹克学术活动 United States of America Computing Olympiad 简称USACO，USACO学术活动是美国最具认可度的计算机学术活动，用于选拔美国参加全球信息奥林匹克学术活动（IOI）的国家队，学术...
AQA A Level Chemistry复习笔记1.6.1 Bond Energy
Bond Energy During a reaction, enthalpy changes take place because bonds are being broken and formed Energy (in the form of heat) is needed to overcome attractive forces between atoms Bond breaking...
AQA A Level Chemistry复习笔记1.5.1 Shapes of Simple Molecules & Ions
Electron Pairs The valence shell electron pair repulsion theory (VSEPR) predicts the shape and bond angles of molecules Electrons are negatively charged and will repel other electrons when close to...
AQA A Level Chemistry复习笔记1.4.1 Changes in State: Energy Changes
State Changes Changes of state are physical changes that are reversible These changes do not change the chemical properties or chemical makeup of the substances involved Vaporization includes evapo...
