在STEM專業(yè)申請(qǐng)難度水漲船高的趨勢(shì)中，計(jì)算機(jī)專業(yè)始終是STEM中“熱上加熱”的專業(yè)，高就業(yè)率、高薪資是它的代名詞。 對(duì)于喜歡計(jì)算機(jī)專業(yè)的留學(xué)預(yù)備黨來(lái)說(shuō)，參加高含金量計(jì)算機(jī)國(guó)際學(xué)術(shù)活動(dòng)不僅可以提升計(jì)算機(jī)硬實(shí)力...
Addition Polymerisation: Polythene & PVC Addition polymerisation Addition polymerisation?is one of the most important addition reactions of alkenes which form the basis of the plastic industry ...
Production of Nitriles Nitriles?are compounds with a -CN functional group They can be prepared from the?nucleophilic substitution?of halogenoalkanes Propanenitrile, an example of a nitrile Reaction...
Production of Amines Amines?are compounds with the amine (-NH2) functional group They can be produced as a result of?nucleophilic substitution?reactions of halogenoalkanes when they are heated unde...
Production of Esters 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...
Production of Carboxylic Acids Carboxylic acids?are compounds with a -COOH functional group They can be prepared by a series of different reactions Oxidation of primary alcohols & aldehydes Car...
Iodoform Reaction Tri-iodomethane?(also called?iodoform) forms a?yellow precipitate?with?methyl ketones Methyl ketones are compounds that have a CH3CO-group Ethanal?also contains a CH3CO- group and...
Testing for Carbonyls: 2,4-DNPH 2,4-dinitrophenylhydrazine (also known as?2,4-DNPH) is a reagent which detects the presence of?carbonyl compounds?(compounds with -C=O group) The carbonyl group of?a...
Reaction of Hydrogen Cyanide with Aldehydes & Ketones The carbonyl group -C=O, in aldehydes and ketones is?polarised The oxygen atom is more?electronegative?than carbon drawing electron density...
Reactions of Aldehydes & Ketones Reduction of aldehyde & ketones Aldehydes?and?ketones?can be reduced by reducing agents such as NaBH4?or LiAlH4 Aldehydes are reduced to?primary alcohols Ke...
Production of Aldehydes & Ketones Aldehydes?and?ketones?are carbonyl compounds containing a C=O group They can be prepared from the oxidation of?primary?and?secondary?alcohols?respectively Oxid...
Acidity of Alcohols Alcohols have a?low degree of dissociation This means, that when dissolved in water, alcohol molecules do not?dissociate?(split up) to a great extent ROH (aq) ? RO- (aq) + H+ (a...
