哈佛錄取率逐年降低，2022年最新錄取哈佛優秀文書展示
近日，很多大學都陸續公布了2022年的新生錄取數據，哈佛大學也不例外。與往年數據一對比，簡直不敢相信自己的眼睛。一起來看看吧~ 申請人數再度攀升，錄取率逐年降低 哈佛大學2026屆申請數據 申請批次 申請數量 ...
IB DP Chemistry: SL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
IB DP Chemistry: SL復習筆記10.2.11 Alcohols - Esterification
Esterification Esters?are compounds with an -COOR functional group and are characterised by their?sweet?and?fruity?smells They are prepared from the?condensation?reaction between a?carboxylic acid?...
IB DP Chemistry: SL復習筆記10.2.10 Alcohols - Oxidation
Oxidation of Primary Alcohols The products of oxidation of?alcohols?depends on the class of?alcohols Here is a reminder of the three classes of alcohols: The three classes of alcohols Primary alcoh...
IB DP Chemistry: SL復習筆記10.2.9 Alcohols - Combustion
Combustion of Alcohols Alcohols react with oxygen in the air when ignited and undergo?complete combustion?to form carbon dioxide and water Alcohol + oxygen → carbon dioxide + water Complete combust...
IB DP Chemistry: SL復習筆記10.2.8 Addition Polymers
Polymers Addition polymerisation Addition polymerisation?is one of the most important addition reactions of alkenes which form the basis of the plastic industry Addition polymerisation is the react...
