1)Are the alkene more reactive than the alkanes?give a reason~
2)Do you think alkene produce a soptier flame than alkanes? why?
3)Which test could be used to distinguish alkanes and alkenes?
2006-11-09 02:50:27 · 7 answers · asked by k27118771 1 in Science & Mathematics ➔ Chemistry
1. Alkenes have double bonds, compared to single bonds of alkanes.
2. Perhaps K means "sootier"; more soot production?
3. Bromine water, perhaps.
2006-11-09 03:21:06 · answer #1 · answered by tranquil 6 · 1⤊ 1⤋
1) Yes the alkenes are more reactive than the alkanes as they have a double bond.
2) The alkenes do produce as sootier flame.
3) The test to distinguish between alkanes and alkenes is the reaction with bromine solution. Alkenes react with bromine readilly, decolourising the bromine solution and the alkanes only react slowly with bromine solution in the presence of UV light.
2006-11-10 22:33:14 · answer #2 · answered by weegleajeems 2 · 0⤊ 0⤋
1) One of the bonds in the alkene's double bond is a strong (sigma) bond, same as normal single bonds, but the other is a weaker (pie) bond. This is more easily broken and so alkenes are more reactive.
2) Sorry don't know.
3) React with Br2 solution (you may or may not need to write "in the dark" depending on your level). The solution will turn from brown to colourless with an alkene but be unchanged with an alkane. The reason for this is that bromine undergoes electrophillic addition across the double bond.
2006-11-10 21:42:52 · answer #3 · answered by Thesmileyman 6 · 0⤊ 1⤋
Alkenes are more reactive than alkanes as the alkenes have a double bond between two of the carbon atoms. Effectively there is a 'spare' bond to react with substances.
Alkenes produce a sootier (softer) flame than alkanes as there is a higher proportion of carbon than hydrogen and the heat of the flame 'cracks' the molecule to give an alkane and carbon.
There are two tests for alkenes. One is that they will make orange coloured bromine water go colourless and (2) they decolourise a dilute acidified solution of potassium permanganate. Alkanes have no effect on these two chemicals.
2006-11-10 08:43:14 · answer #4 · answered by Anonymous · 0⤊ 1⤋
Q3 is when u add bromine water to alkene...the solution will turn colourless
2006-11-09 06:03:55 · answer #5 · answered by banana 2 · 1⤊ 1⤋
I'm guessing that these are questions related to a lab that you did. You need to look at your observations from the lab and think about what you did and saw, and how that relates to these questions.
By the way, what is "soptier"?
2006-11-09 02:59:36 · answer #6 · answered by hcbiochem 7 · 1⤊ 1⤋
Vat iss this "soptier", plis?
2006-11-09 02:59:05 · answer #7 · answered by Anonymous · 0⤊ 1⤋