AQA A Level Chemistry復習筆記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復習筆記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復習筆記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復習筆記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Salts Quaternary ammonium salts?are chemical analogues to ammonium chloride, NH4Cl, in which the hydrogens have been replaced by four alkyl groups They are very useful in...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復習筆記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...
AQA A Level Chemistry復習筆記7.5.3 Nucleophilic Substitution
Nucleophilic Substitution The lone pair on the nitrogen atom in amines makes them good?nucleophiles, just like ammonia When ammonia reacts with a haloalkane a nucleophilic substitution react...
AQA A Level Chemistry復習筆記7.5.2 Basic Properties
Basic Properties The nitrogen atom in ammonia and amine molecules can?accept?a?proton?(H+?ion) They can therefore act as?bases?in aqueous solutions by?donating?its lone pair of electrons to ...
ALevel CS里的分解和抽象相關真題解析！
ALevel CS大綱里要求我們掌握抽象和分解的概念，事實上，歷年真題里也有很多反應這兩種方法的題目，抽象和分解也是我們解決問題的一種思路，那么什么是抽象？什么是分解呢？ 什么是抽象？ 抽象是指看問題時過濾調...
AQA A Level Chemistry復習筆記7.4.3 Friedel–Crafts Acylation
Friedel–Crafts Acylation Arenes are very stable compounds due to the?delocalisation of π electrons?in the ring This is because the negative charge is spread out over the molecule instead of ...
