Edexcel A Level Chemistry:复习笔记1.7.4 Yield & Atom Economy
Yield & Atom Economy 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 r...
Edexcel A Level Chemistry:复习笔记1.7.3 Error & Uncertainty
Error & Uncertainty An error is the difference between a value or quantity obtained in an experiment and an accepted or literature value for an experiment There are two types of errors i...
Edexcel A Level Chemistry:复习笔记1.7.2 Titrations
Titration Calculations Volumetric Analysis Volumetric analysis is a process that uses the volume and concentration of one chemical reactant (standard solution) to determine the concentration...
Edexcel A Level Chemistry:复习笔记1.7.1 Reacting Volume Calculations
Reacting Volume Calculations Reacting volume calculations are commonly associated with the reactions of gases All gases occupy the same volume under the same conditions At room temperature a...
Edexcel A Level Chemistry:复习笔记1.6.5 Amount of Substance Calculations
Amount of Substance Calculations As previously discussed, the amount of substance can be defined as the number of particles in a substance, n, measured in moles (often abbreviated to mol) In...
Edexcel A Level Chemistry:复习笔记1.6.4 The Mole & the Avogadro Constant
The Mole & Avogadro The Avogadro constant (NA or L) is the number of particles equivalent to the relative atomic mass or molecular mass of a substance The Avogadro constant applies to at...
Edexcel A Level Chemistry:复习笔记1.6.3 Applying Equations
Relating Observations to Chemical Equations Chemical equations give information about the reaction that is taking place Balanced equations show the number of particles participating in the r...
Edexcel A Level Chemistry:复习笔记1.6.2 Balanced Equations
Writing Balanced Equations A symbol equation is a shorthand way of describing a chemical reaction using chemical symbols to show the number and type of each atom in the reactants and product...
Edexcel A Level Chemistry:复习笔记1.6.1 Empirical & Molecular Formulae
Empirical & Molecular Formula Definitions The molecular formula is the formula that shows the number and type of each atom in a molecule E.g. the molecular formula of ethanoic acid is C2...
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很多学生和家长都有一个误解，以为参加学术活动不用着急，时间有的是，直到高中毕业都可以 “慢慢比”。要知道学术活动一般流程较长，出成绩时间也慢，从初赛到出结果可能会用到半年甚至更久的时间。如果想将成绩用...
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近年来，随着全球经济、科学及技术迅速发展，对人才教育的要求也随之增加，传统教育已然不太满足社会转变的需求，在此情形下，STEM教育应运而生，是目前教育的潮流趋势，对于孩子的成长和发展更是有着明显的优势...
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