Flashcards
Properties of Alkenes and Stereoisomerism
Cards in this deck (11)
- 1What are alkenes described as? What characteristic gives them this name?Alkenes are described as 'unsaturated hydrocarbons'. This is because they have a double bond.
- 2How many regions of electron density are there around each carbon atom?There are 3 regions of electron density.
- 3What is the bond angle around each carbon atom in a double bond and why?The bond angle is 120 degrees, this is because of the three regions of electron density that repel each other as far as possible.
- 4Can the atoms around a double bond rotate? Explain.No, this is due to the two pi-bonds that are on each side of the sigma bond, locking the atoms in place and preventing them from rotation around the double bond.
- 5State what is meant by the term 'unsaturated'Unsaturated mean that there is a double bond, or there could be more than one double bond.
- 6What is the molecular formula, and the name, of the alkene that contains 5 carbons, with the double bond between carbons 2 and 3, and a chlorine on carbon 1.Name: 1-chloropent-2-ene
Molecular Formula: C5H9Cl - 7What is the difference between a sigma bond, and a pi bond?A sigma bond is directly between the two carbon atoms, it is a head on overlap of orbitals, whereas the two pi bonds are above and below the sigma bond and are a sideways overlap of p-orbitals.
- 8Define StereoisomerismWhen two isomers have the same structural formula, but a different arrangement in space.
- 9What conditions are needed for an isomer to be an E/Z Isomer?- A C=C double bond.
- Different groups attached to each C atom of the double bond. - 10If something is an E isomer, what does this mean?The highest priority groups are diagonally across from each other.
- 11If something is a Z Isomer, what does this mean?The highest priority groups are on the same side of the double bond.
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- AS - Level Chemistry (13 - Alkenes) Flashcards on Properties of Alkenes and Stereoisomerism, created by Bee Brittain on 10/03/2016.
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- Bee Brittain
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