Recent content by jadelamlam

Please see their definitions: Flash point The flash point of a volatile material is the lowest temperature at which it can vaporize to form an ignitable mixture in air. (i.e. the lowest temp to start a fire) At the flash point, the vapor may cease to burn when the source of ignition is...

The autoignition temp of n-butane(straight chain) is 288 degree Celcius while that of isobutane(branched chain) is 460 degree Celcius. The flash point of n-butane is -60 degree Celsius while that of isobutane is -83 degree Celcius. I was confused by these..Why does n-butane have a higher...

Homework Statement Hi, there are 2 pictures in the above,pic 2 shows a diamond in rectangular shape. pic 1 shows the 3D structure of that diamond at a corner of it. As we know,diamond has a giant covalent structure,which means atoms in it are linked together by covalent bonds only...

Alkenes react with concentrated sulphuric acid in the cold to produce alkyl hydrogensulphates. If the alkyl hydrogensulphate is diluted with water and heated, alcohol is obtained My question: Can alkenes react with hot conc h2so4 directly?Any reaction between them? What are the products...

I just can't understand :( Hexane can dissolve bromine.What would happen if we don't add Br into the organic solvent? There will be no reaction?Or sth bad will happen?

Where does the nitrogen go?

Oh,is that means,petroleum is heated with the absence of air in the furnace?

Hi, During fractional distillation,crude oil is heated to a certain temperature,then it is pumped into the fractional tower. As you know,petroleum is a mixture of alkanes.When it is heated in the furnace(to about 400°C),it does not burn.But lower alkanes(e.g.CH4) are extremely flammable,why it...

In substitution reaction between bromine and hexane, why the bromine should be in organic solvent? Bromine is already a liquid!

Thx a lot.But do you know the reasons of it?

Homework Statement Give the IUPAC name of the following compound ＯＨ　　Cl ｜　　　｜ Ｃ－Ｃ－Ｃ－Ｃ 　　｜ 　　ＯＨ (Note:Hydrogen atoms are not drawn) Homework Equations The Attempt at a Solution Model answer:3-chlorobutane-1,2-diol Why it is called 3-chlorobutane-1,2-diol instead of...

So it will burn?

I have attached a diagram.

Homework Statement My textbook states that one of the safety precautions to be taken in the fractional distillation of petroleum(in school laboratory) is using a small flame to heat the rocksil(rocksil is soaked with petroleum),and avoil using stationary flame for heating. Can anyone explain...

thx a lot,I understand it now!