Could someone help me with covalent bonding with alkenes and alkanes?

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I really dont understand ethene, propene and butene


Posted Tue 26th June, 2012 @ 15:36 by Izzy Swain

3 Answers

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Well, ethene has the chemical structure of: C2H4

Propene: c3H6

Butane: C4H8

For alkenes, they have the formula of CnH2n

For alkanes, they have the formula of CnH2n+2

Alkenes and alkanes both have covalent bonds, where they basically 'share' electrons for a full outer shell.

Alkanes:             H    H

                          |     |

                   H -- C -- C -- H

                          |     |

                         H     H

Alkenes:               H    H

                            |     |

                    H -- C = C -- H

                            |    |

                           H    H

Alkenes have a double bond.

Answered Tue 26th June, 2012 @ 22:57 by EstherTheBunny
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Covalent bonds are when atoms share unpaired electrons to fill up the outer shell.

Single bonds (Alkanes): Firstly take the carbon. it has 4 electrons, all of which are able to pair up with another unpaired electron in another atom. In ethane, it can pair up with another carbon or a hydrogen. (see example below)

Ethane Molecule showing Covalent Bonding Dot and Cross (

Double Bonds (Alkenes): This is when two elctrons from one atom pair up with two electrons from another atom to form a bond. (see diagram below)


The diagrams should hopefully make it a bit clearer!

Answered Wed 27th June, 2012 @ 16:46 by Sophie
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Thanks the diagrams did really help :)

Answered Thu 28th June, 2012 @ 15:41 by Izzy Swain