Introduction of the book Article 1 : Why doesn't the 3 Second Glue adhere to the tube? Article 2 : What are the differences among green tea, red tea and.

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Presentation transcript:

Introduction of the book Article 1 : Why doesn't the 3 Second Glue adhere to the tube? Article 2 : What are the differences among green tea, red tea and oolong tea?

Title: 蘇老師生活化學快問妙答 (Dr. Joe & What You Didn't Know: 177 Fascinating Questions & Answers about the Chemistry of Everyday Life) Author: 蘇瓦茲 Schwarcz, Joe

Dr. Joe used simply scientific theory to explain many everyday problems ignored by us ↪ easy to understand ↪ cause our curiosities The problems involved many regions e.g. daily activities, health care, history, food science But all of them can be explained by science Why did we find it interesting

Let’s us show you two interesting articles in the book!!!

Main component of 3 Second Glue: Ethyl 2-cyanopropenoate (ECA) ( 氰基丙烯酸酯 ) a colourless liquid with low viscosity

ECA directly contacts with the air when pressed out of the tube join the bonded surfaces together oxygen atom hydrogen atom

CH 2 (CN)CO 2 Et + CH 2 O ➩ CH 2 =C(CN)CO 2 Et + H 2 O

We notice that...

Green TeaBlack (Red) teaOolong tea

 the result of curing the tender camellia leaf  various methods and degrees of heat can be use

Red rooibos

fully oxidised before drying by a careful withering process

the raw leaves are sun-wilted and then bruised exposes their juices to the air leaves oxidise ➩ turn brown

Also we find that tea benefits our health !  Tea leaves contain more than 700 chemicals e.g. Green tea is rich in catechin polyphenols, particularly in epigallocatechin gallate (EGCG) EGCG is a powerful anti-oxidant inhibiting the growth of cancer cells killing cancer cells without harming healthy tissue lowering LDL cholesterol levels inhibiting the abnormal formation of blood clots