Edexcel IGCSE Maths復習筆記 1.10.1 Rounding & Estimation
Edexcel IGCSE Maths復習筆記 1.10.1 Rounding & Estimation Why use estimation? We?estimate?to find approximations for difficult sums Or to check our answers are about the right size (right order ...
教育部海外學歷認證最新政策！附學歷認證申請攻略
又到一年畢業(yè)季。 對于留學生來說，回國的第一件事就是要將自己的海外學歷進行認證，它不僅是找工作的必備材料，也是享受留學回國政策的一大憑證！ 最近，教育部留學服務(wù)中心發(fā)布了最新的海外學歷認證規(guī)范通知。...
2023UKChO英國化學奧賽，備賽報名開啟！附國際化學奧賽時間軸
UKChO 英國化學奧林匹克學術(shù)活動（UK Chemistry Olympiad）由英國皇家化學學會主辦。英國皇家化學會是全球具有非凡影響力的化學學術(shù)組織之一，匯聚來自世界各地的化學科學家。英國化學奧林匹克學術(shù)活動中的試題會...
AQA A Level Chemistry復習筆記3.3.1 Reactivity of Halogenoalkanes
Reactivity of Halogenoalkanes The halogenoalkanes have different?rates?of?substitution?reactions Since substitution reactions involve?breaking?the?carbon-halogen?bond the?bond?energies?can b...
AQA A Level Chemistry復習筆記3.2.1 Fractional Distillation of Crude Oil
Fractional Distillation Crude oil is currently the world's main source of organic chemicals As a mixture, it isn’t a very useful substance, but the different hydrocarbons that make up the mixture, ...
AQA A Level Chemistry復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
