CIE A Level Physics复习笔记1.2.1 Errors & Uncertainties
Random & Systematic Errors Measurements of quantities are made with the aim of finding the true value of that quantity In reality, it is impossible to obtain the true value of any quantity, the...
CIE A Level Physics复习笔记1.1.4 Scalars & Vectors
What are Scalar & Vector Quantities? A scalar is a quantity which only has a magnitude (size) A vector is a quantity which has both a magnitude and a direction For example, if a person goes on ...
CIE A Level Physics复习笔记1.1.3 Homogeneity of Physical Equations & Powers of Ten
Homogeneity of Physical Equations An important skill is to be able to check the homogeneity of physical equations using the SI base units The units on either side of the equation should be the same...
CIE A Level Physics复习笔记1.1.2 SI Units
SI Base Quantities There is a seemingly endless number of units in Physics These can all be reduced to six base units from which every other unit can be derived These seven units are referred to as...
CIE A Level Physics复习笔记1.1.1 Physical Quantities
What is a Physical Quantity? Speed and velocity are examples of physical quantities; both can be measured All physical quantities consist of a numerical magnitude and a unit In physics, every lette...
CIE A Level Chemistry复习笔记8.1.7 Deuterated Solvents in Proton NMR
Deuterated Solvents in Proton NMR When samples are analysed through NMR spectroscopy, they must be dissolved in a solvent Tetramethylsilane (TMS) is a commonly used solvent in NMR Despite TMS showi...
CIE A Level Chemistry复习笔记8.1.6 Use of Tetramethylsilane (TMS)
Use of Tetramethylsilane (TMS) In NMR spectroscopy, Tetrametylsilane (TMS) is used as a reference compound The organic compound is dissolved in TMS before being introduced to the magnetic field of ...
CIE A Level Chemistry复习笔记8.1.5 Proton (1H) NMR Spectroscopy
Interpreting & Explaining Proton (<sup>1</sup>H) NMR Spectra Nuclear Magnetic Resonance (NMR) spectroscopy is used for analysing organic compounds Atoms with odd mass numbers usuall...
CIE A Level Chemistry复习笔记8.1.4 Interpreting & Explaining Carbon-13 NMR Spectroscopy
Interpreting & Explaining Carbon-13 NMR Spectra Nuclear Magnetic Resonance (NMR) spectroscopy is used for analysing organic compounds Atoms with odd mass numbers usually show signals on NMR For...
CIE A Level Chemistry复习笔记8.1.3 Interpreting Rf Values in GL Chromatography
Interpreting Rf Values in GL Chromatography Features of a gas-liquid chromatogram Peaks represent different molecules from the sample - each roughly taking the shape of a triangle The area under ea...
CIE A Level Chemistry复习笔记8.1.2 Gas/Liquid Chromatography: Basics
Gas/Liquid Chromatography: Basics Gas-Liquid Chromatography (GLC) is used for analysing: Gases Volatile liquids Solids in their vapour form The stationary phase: This method uses a column for the s...
CIE A Level Chemistry复习笔记8.1.1 Thin-Layer Chromatography
Thin Layer Chromatography: Basics Thin Layer Chromatography (TLC) is a technique used to analyse small samples via separation For example, we could separate a dye out to determine the mixture of dy...
