IB DP Chemistry: SL复习笔记11.2.5 Drawing Graphs
Drawing Graphs General guidance on drawing graphs Graphs need to have: Clear title Labelled axes Units on the axes Appropriate linear scales without any jumps This means the plotted graph must occu...
IB DP Chemistry: SL复习笔记11.2.4 Percentage Error
Percentage Error Percentage error is used to express the difference between a final calculated answer and an accepted or literature value It is calculated using the following formula You should be ...
IB DP Chemistry: SL复习笔记11.2.3 Reducing the Impact of Errors
Reducing Errors Random errors can be reduced by repeated trials and measurements Multiple measurements when averaged will reduce the impact of a random error on the average The more readings you ha...
IB DP Chemistry: SL复习笔记11.2.2 Processing Errors
Types of Errors 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 in experiments, ...
哈佛录取率逐年降低，2022年最新录取哈佛优秀文书展示
近日，很多大学都陆续公布了2022年的新生录取数据，哈佛大学也不例外。与往年数据一对比，简直不敢相信自己的眼睛。一起来看看吧~ 申请人数再度攀升，录取率逐年降低 哈佛大学2026届申请数据 申请批次 申请数量 ...
IB DP Chemistry: SL复习笔记11.2.1 Recording Data
Qualitative & Quantitative data When recording results of experiment, both quantitative and qualitative data should be obtained Quantitative data is obtained from measurements whereas qualitati...
IB DP Chemistry: SL复习笔记11.1.4 Infrared Spectroscopy
How IR Spectroscopy works All covalent bonds act rather like springs, as opposed to rigid bars Like springs, the bonds can vibrate in a number of different ways The frequency of vibration occurs in...
IB DP Chemistry: SL复习笔记11.1.3 Nuclear Magnetic Resonance Spectroscopy
How NMR works Nuclear Magnetic Resonance (NMR) spectroscopy is used for analysing organic compounds Only atoms with odd mass numbers show signals on NMR spectra and have the property of nuclear spi...
IB DP Chemistry: SL复习笔记11.1.2 Mass Spectrometry
Determining Molecular Mass When a compound is analysed in a mass spectrometer, vaporised molecules are bombarded with a beam of high-speed electrons These knock off an electron from some of the mol...
IB DP Chemistry: SL复习笔记11.1.1 Index of Hydrogen Deficiency
Index of Hydrogen Deficiency The degree of unsaturation or index of hydrogen deficiency provides information about the number of double or triple bonds in a molecule The IHD is the number of...
IB DP Chemistry: SL复习笔记10.2.13 Reactions of Benzene
Reactions of Benzene Arenes are very stable compounds due to the delocalisation of π electrons in the ring This is because the electron density is spread out over the molecule instead of being conf...
IB DP Chemistry: SL复习笔记10.2.12 Halogenoalkanes
Reactions of Halogenoalkanes Halogenoalkanes are much more reactive than alkanes due to the presence of the electronegative halogens The halogen-carbon bond is polar causing the carbon to carry a p...
