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Are electrons in non-polar covalent molecules localised or delocalised amd mobile?
Either one is possible. In benzene, the twelve electrons in the six carbon-hydrogen bonds are localized and the remainder of the electrons are delocalized and can move freely around the benzene ring.
In Normal Phase HPLC which elutes first n-hexane or benzene Both are non-polar so the retention time on the column should be low but I don't know which one is most nonpolar.?
You can look up solvent polarity by looking up their dielectric constant (the higher the constant the more polar it is). n-hexane has a dielectric constant of 2.0, where as benzene has a dielectric constant of 2.3. This means that benzene is more polar than n-hexane. (Source: http://en.wikipedia.org/wiki/Solvent). On a Normal Phase HPLC column, the column is coated in silica gel which is very polar. The rule "like dissolves like" is important, as you pass your sample through the column the polar molecules will grip on tighter to the silica gel, where as the non-polar molecules will flow through easier. This means that in a Normal Phase HPLC "race" down the column, it is the n-hexane that will come out first.
Is toluene miscible with ethyl alcohol?
While ethanol is strongly polar, and toluene is only slightly polar, the two solvents are miscible. Just pour one into the other and stir a little to evenly distribute it. Toluene and ethanol mixtures have been tried as an alternative solvent to benzene and ethanol, as benzene has been found to be carcinogenic.
What is the chemical formula of chlorobenzene?
Benzene is equal parts hydrogen and carbon, and has C6H6 as it molecular formula. It is actually a ring with the carbons in the middle and the hydrogen bonded one-to-one with the carbon atoms on the outside. Use the link below for more information and to see a "picture" that cannot be drawn here.
How do you remove benzene from water?
There is more than one method, but benzene is a contaminant of drinking water sometimes and the EPA suggests Granular activated charcoal in combination with Packed Tower Aeration to remove it.
Is alcohol more soluble in benzene or alkane?
Alcohol is not that soluble in either benzene or alkane. This is because they are both nonpolar and it is polar.
Is 2-naphthol polar or non polar?
It is a molecule with 2 benzene rings attached to one another and has an -OH group attached to one of the benzene rings. The molecule is slightly polar due to the -OH hydrogen bonding group but because the 2 benzene rings are so big, it tends to dissolve in non-polar molecules.
What is an example of cyclic hydrocarbon?
A halogenated hydrocarbon is a hydrocarbon in which one or more hydrogen atoms is replaced with a halogen atom such as chlorine or fluorine. One example of a halogenated hydrocarbon is trichloroethylene.
Are electrons in non-polar covalent molecules localised or delocalised amd mobile?
Either one is possible. In benzene, the twelve electrons in the six carbon-hydrogen bonds are localized and the remainder of the electrons are delocalized and can move freely around the benzene ring.
In Normal Phase HPLC which elutes first n-hexane or benzene Both are non-polar so the retention time on the column should be low but I don't know which one is most nonpolar.?
You can look up solvent polarity by looking up their dielectric constant (the higher the constant the more polar it is). n-hexane has a dielectric constant of 2.0, where as benzene has a dielectric constant of 2.3. This means that benzene is more polar than n-hexane. (Source: http://en.wikipedia.org/wiki/Solvent). On a Normal Phase HPLC column, the column is coated in silica gel which is very polar. The rule "like dissolves like" is important, as you pass your sample through the column the polar molecules will grip on tighter to the silica gel, where as the non-polar molecules will flow through easier. This means that in a Normal Phase HPLC "race" down the column, it is the n-hexane that will come out first.
Do benzene dissolve in oil?
Yes. Both butane and benzene are non-polar compounds and should dissolve one in the other.
Is toluene miscible with ethyl alcohol?
While ethanol is strongly polar, and toluene is only slightly polar, the two solvents are miscible. Just pour one into the other and stir a little to evenly distribute it. Toluene and ethanol mixtures have been tried as an alternative solvent to benzene and ethanol, as benzene has been found to be carcinogenic.
Which one is more polar naphthalene or butyric acid?
butyric acid is more polar
Which isomer of xylene does form only one trisubstituted benzene?
Meta-xylene forms only one trisubstituted benzene (1,2-dimethyle benzene).
Which one is more polar ferrocene or fluorenone?
Fluorenone is more polar than ferrocene.Ferrocene is non-polar due to its symmetry.
When a molecule possesses more than one polar bondis it always polar?
always polar
How do you use a phenopthalene indicator?
phenols can be prepared by the following methods. 1) hydrolysis of cholorobenzene: in this process, chlorobenzene which can be obtained by the cholorinationof benzene, is heated at 350*C under high pressure with aqueous sodium hydroxide to get sodium phenoxide, which on acidification yields phenol. 2) pyrolosis of sodium benzenesulphonate: this, the first commercial process for industrial synthesizing phenol , was developed in Germany in 1890. sodium benzenesulphonate is melted with sodium hydrooxide at 350*C to produce sodium phenoxide, which on acidification yields phenol. 3) oxidaton of cumene: benzene is alkylated with propene to produce cumene, which is oxidized with air to produce cumene hydroperoxide, which on treatment with 10% sulfuric acid undergoes a hydrolytic rearrangement to yield phenol and acetone.
