AQA A Level Chemistry复习笔记1.5.2 Bond Polarity
Electronegativity Electronegativity is the power of an atom to attract the pair of electrons in a covalent bond towards itself The electron distribution in a covalent bond between elements w...
AQA A Level Chemistry复习笔记1.4.10 Effects of Structure & Bonding
Effects of Bonding & Structure on Physical Properties Different types of structure and bonding have different effects on the physical properties of substances such as their melting and b...
AQA A Level Chemistry复习笔记1.4.9 Properties of Metallic Substances
Metallic Lattice Structures Metals form giant metallic lattices in which the metal ions are surrounded by a ‘sea’ of delocalised electrons The metal ions are often packed in hexagonal layers...
AQA A Level Chemistry复习笔记1.4.8 Properties of Covalent Substances
Covalent Lattice Structures Covalent lattices Covalent bonds are bonds between nonmetals in which electrons are shared between the atoms Covalent compounds can be arranged in simple molecula...
AQA A Level Chemistry复习笔记1.4.7 Properties of Ionic Compounds
Ionic Lattice Structures Most ionic, metallic and covalent solids are crystalline lattices The ions, atoms or molecules are arranged in a regular and repeating arrangement Giant ionic lattic...
AQA A Level Chemistry复习笔记1.4.6 Metallic Bonding
Metallic Bonding: Definition Metal atoms are tightly packed together in lattice structures When the metal atoms are in lattice structures, the electrons in their outer shells are free to mov...
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...
