Reacting an alkene with water (steam) in the presence of a phosphoric acid catalyst produces an alcohol (e.g., ethene becomes ethanol).
Always remember that the bromine water test distinguishes between alkanes (no color change) and alkenes (decolorizes).
Be prepared to draw displayed formulas (showing all bonds) and molecular formulas for the first four alkenes. chemsheets 1232 answers
They are called "unsaturated" because they do not contain the maximum possible number of hydrogen atoms for the given number of carbons. Core Reactions Covered in Chemsheets 1232
). This double bond is their functional group and is responsible for their high chemical reactivity compared to alkanes. The general formula for alkenes is CnH2ncap C sub n cap H sub 2 n end-sub Key Examples: Common alkenes include ethene ( C2H4cap C sub 2 cap H sub 4 ), propene ( C3H6cap C sub 3 cap H sub 6 ), and butene ( C4H8cap C sub 4 cap H sub 8 Reacting an alkene with water (steam) in the
). The reaction with bromine water is a standard test for unsaturation: the orange-brown liquid turns . Reaction with Hydrogen (Hydrogenation): Adding H2cap H sub 2
Alkenes are the monomers used to create addition polymers like poly(ethene). This involves thousands of alkene molecules joining together as the double bonds open up. They are called "unsaturated" because they do not
Alkenes are a homologous series of that contain at least one carbon-to-carbon double bond (
Alkenes react with halogens like bromine ( Br2cap B r sub 2 ) or chlorine ( Cl2cap C l sub 2
The worksheet emphasizes the various that alkenes undergo. In these reactions, the double bond breaks to form a single bond, allowing new atoms to join the carbon atoms.