英國大學認可的Duolingo多鄰國、朗思語言考試介紹
在全球疫情下，很多地區的托福、雅思考試隨時會面臨取消，越來越多的海外院校宣布，其他的語言考試可以替代托福、雅思，比如英國大學認可的Duolingo多鄰國、朗思語言考試介紹。 什么是多鄰國英語考試 多鄰國英語...
AQA A Level Chemistry復習筆記1.5.4 Effects of Forces Between Molecules
Influence of Intermolecular Forces Properties of water Hydrogen bonding in water, causes it to have?anomalous properties?such as high melting and boiling points, high surface tension and a h...
AQA A Level Chemistry復習筆記1.5.3 Types of Forces Between Molecules
Intramolecular Forces vs. Intermolecular Forces Intramolecular forces Intramolecular forces?are forces?within?a molecule and are usually covalent bonds Covalent bonds?are formed when the out...
AQA A Level Chemistry復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
