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...
IBO课改后IBDP HL数学考什么？
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英国大学研究生热门专业有哪些？
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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
Quaternary Ammonium Salts Quaternary ammonium salts are chemical analogues to ammonium chloride, NH4Cl, in which the hydrogens have been replaced by four alkyl groups They are very useful in...
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...
