alkanes and alkenes

• what is the general formula for alkanes?

  CnH2n+2
• what does monkeys eat peanut butter stand for?

  methane, ethane, propane , butane
• are alkanes saturated or unsaturated and why?

  saturated, contain no c=c double bonds because each carbon has formed its maximum of 4 bonds
• what happens when alkanes react with halogens with the presence of UV light?

  halogen + alkane (+UV)-> ​halogenoalkane + hydrogen halide

  (one of the hydrogens is replaced with the halogen and hydrogen and the alkane form a separate bond)
• what is the general formula for alkenes?

  CnH2n
• are alkenes saturated or unsaturated and why?

  unsaturated because they contain 1 or more C=C
• what happens when alkenes react with bromine?

  they make dibromoalkane, addition reaction, involves the removal of C=C
• how can bromine water be used to distinguish and alkane and an alkene?

  alkenes react with bromine water turning it from orange to colourless and alkanes do not(it remains orange)