在本影片中学习如何熟悉滴定技术---用酚?在酸/碱滴定中的详 细示范。 Learn how to master the art of titration in this video-with a detailed demonstration of an acid/base titration using phenolphthalein

薄层分析法在许多研究实业室是最常用的此影片将带领你每 步骤,从准备跑瓶到计算RF(retention factor)值 步骤, Thin-layer chromatography is the most commonly used analytical technique in many research labs. This video walks you through every step from setting up a developing chamber to calculating Rf values

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Of the three groups of biopolymers, protein have the most diverse function. Most of its molecular weights are much larger. Their shaps cover a range from the globular protein to the helical coils of a α–keratin. But all proteins have common features. Proteins are polyamides and their monomeric units are about 20 different α-amino acids

The important of acid-base reaction: 1. is a simple, fundamental reaction. 2. enable you to see the mechanism of the reaction 3. illustrate the process of bond breaking and bond making 4. examine important ideas about the relationship between the structure of molecules and their reactivity

Chapter 6 Ionic Reactions--- Nucleophilic substitution and elimination reactions of alkylhalides (卤代烃的亲核取代反 Because halogen atoms are more electronegative 应和消除反应） than carbon, the carbon-halogen bond of alkyl halides is polarized; the carbon atom bears a partial positive charge, the halogen atom a partial negative charge

The nucleic acids, deoxyribonucleic (DNA) and ribonucleic (RNA) , are, respectively , the molecules that preserve here￾ditary information and that transcribe and translate it in a way that allows the synthesis of all the varied proteins of the cell 25.2 NUCLEOTIDES AND NUCLEOSIDES

In common nomenclature most primary amines are named as alkylamines. In systematic nomenclature they are named by adding the suffix –amine to the name of the chain or ring system to which the NH2 group is attached with elision of the final e Primary Amines;

18.1 Introduction The carboxyl group, -COOH, -CO2H, is one of the most widely occurring functional groups in chemistry and biochemistry. Not only are carboxylic acids themselves important, but the carboxyl group is the parent group of a large family of related compounds

Cycloalkanes with only one ring are named by attaching the prefix cyclo- to the names of the alkanes possessing the same number of carbon atoms