AQA A Level Chemistry复习笔记1.4.5 Dot & Cross Diagrams
Representing Dot & Cross Diagrams Dot and cross diagrams are diagrams that show the arrangement of the outer-shell electrons in an ionic or covalent compound or element The electrons are...
AQA A Level Chemistry复习笔记1.4.4 Dative Covalent Bonding
Dative Covalent Bonding In simple covalent bonds, the two atoms involved share electrons Some molecules have a lone pair of electrons that can be donated to form a bond with an electron-defi...
盘点11个优质小众留学国家，高性价比及高含金量！附各个国家最新出入境政策
这两年，美本在华招生几乎年年“收紧”，英国则热度暴涨、竞争越发激烈。同时，国内家长们对于留学的热情却是年年拔高。 除了英美这两个大热门选手外，世界上那么多国家，还有哪些留学的优质目的地？ 我们曾分享过...
AQA A Level Chemistry复习笔记1.4.3 Covalent Bonding
Covalent Bonding Covalent bonding occurs between two non-metals A covalent bond involves the electrostatic attraction between nuclei of two atoms and the bonding electrons of their outer shells No ...
AQA A Level Chemistry复习笔记1.4.2 Ionic Bonding
Ionic Bonding As a general rule, metals are on the left of the periodic table and nonmetals are on the right-hand side Ionic bonding involves the transfer of electrons from a metallic elemen...
AQA A Level Chemistry复习笔记1.3.4 The Ideal Gas Equation
The Ideal Gas Equation Kinetic theory of gases The kinetic theory of gases states that molecules in gases are constantly moving The theory makes the following assumptions: That gas molecules...
AQA A Level Chemistry复习笔记1.3.3 Reacting Volumes
Volumes & Concentrations of Solutions The concentration of a solution is the amount of solute dissolved in a solvent to make 1 dm3 of solution The solute is the substance that dissolves...
AQA A Level Chemistry复习笔记1.3.2 Reacting Masses
Reacting Masses The number of moles of a substance can be found by using the following equation: It is important to be clear about the type of particle you are referring to when deali...
AQA A Level Chemistry复习笔记1.2.6 Hydrated Salts
Water of Crystallisation Water of crystallisation is when some compounds can form crystals which have water as part of their structure A compound that contains water of crystallisation is ca...
AQA A Level Chemistry复习笔记1.2.5 Atom Economy
Atom Economy The atom economy of a reaction shows how many of the atoms used in the reaction become the desired product The rest of the atoms or mass is wasted It is found directly fr...
最新！URAP世界大学学术排名！
想了解一所学校的学术排名 一定不要错过URAP的 世界大学学术排名！ 这份最近出炉的名单里 华大学术能力碾压清华？ 前十名的学校究竟有多牛？ 这篇文章告诉你~ 前言 随着全球化推动了研究与开发各方面的快速变化，...
AQA A Level Chemistry复习笔记1.2.4 Reaction Yields
Percentage Yield In a lot of reactions, not all reactants react to form products which can be due to several factors: Other reactions take place simultaneously The reaction does not go to co...
