上海德英乐学院2022秋招线上开放日来了！
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2023QS最佳留学城市排名发布，伦敦连续四次蝉联榜首
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AQA A Level Chemistry复习笔记7.7.5 Anticancer Drugs
Action of Anticancer Drugs In the 1960s the drug cis-platin was discovered, which has been extremely effective in treating a number of different types cancer such as testicular, ovarian, cer...
AQA A Level Chemistry复习笔记7.7.4 DNA
DNA The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain A nucleotide is a building block consisting of a phosphate group, 2-deoxyribo...
AQA A Level Chemistry复习笔记7.7.3 Enzymes
Enzymes Enzymes are biological catalysts ‘Biological’ because they function in living systems ‘Catalysts’ because they speed up the rate of chemical reactions without being used up or change...
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AQA A Level Chemistry复习笔记7.7.2 Proteins
Enzymes Enzymes are biological catalysts ‘Biological’ because they function in living systems ‘Catalysts’ because they speed up the rate of chemical reactions without being used up or change...
AQA A Level Chemistry复习笔记7.7.2 Proteins
Proteins Each amino acid contains an amine (-NH2) and carboxylic acid (-COOH) group The -NH2 group of one amino acid can react with the -COOH group of another amino acid in a condensation re...
AQA A Level Chemistry复习笔记7.6.2 Biodegradability & Disposal of Polymers
Biodegradability Biodegradable polymers Both polyesters and polyamides can be broken down using hydrolysis reactions This is a major advantage over the polymers produced using alkene monomer...
AQA A Level Chemistry复习笔记7.5.5 Quaternary Ammonium Salts
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AQA A Level Chemistry复习笔记7.5.4 Nucleophilic Addition–Elimination
Nucleophilic Addition–Elimination An important class of reactions that ammonia and amines undergo is nucleophilic substitution with acyl chlorides (or acid chlorides) and acid anhydrides The...
