Different Types of Formulae Flashcards Preview

Chemistry 6 - Organic Chemistry > Different Types of Formulae > Flashcards

Flashcards in Different Types of Formulae Deck (16)

what are the two main ways to refer to an organic compound

- with their name
- or formulae


what does a displayed formula show

every atom of every bond separately


what would be the displayed formula for ethane

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H- C - C - H
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how is a structural formula created

by grouping all the atoms joined together by a particular carbon atom


what does a structural formula show

- how the atoms unambiguously are joined together
- the bonds between small molecules with a single carbon atom


what would be the structural formula of butane

- CH3-CH2-CH2-CH3
- or just CH3CH2CH2CH3


what is a skeletal formula

a zig-zag line that shows only the bonds between carbon atoms


what does every change in direction and ending of a skeletal formula indicate

- that there is a carbon atom
- you can think of it as the line slightly changing course whenever it reaches a carbon atom


what else would be shown on a skeletal formula

atoms other than carbon and hydrogen


what would be the skeletal formula of butane and why

- /\/
- the beginning is the first carbon atom with CH3
- then it turns at the second carbon atom with CH2
- then turns again at the third with CH2
- then reaches the end with another CH3


why cant C3H7Cl be considered a structural formula

- the chlorine atoms would be bonded either in between carbon atoms or on either side of the carbon chain
- this is because chlorine can only form one bond but it cant form it with a hydrogen that is already bonded with carbon
- and C3H7Cl would wrongly indicate this if it was the structural formula


what would C3H7Cl be correctly called and why

- the molecular formulae
- because it only shows the number of atoms in each molecule
- not its structure or the order they are bonded in
- it can also represent more than one compound


if the molecular formula of a molecule is CH3Cl, could this be used to work out the structural, display and skeletal formulae and why

- yes, because it is very simple
- there is only one way in which those atoms could be arranged
- so that is in effect also its structural formula


what is the empirical formula

the lowest possible whole number ratio of the atoms in a compound


what is the empirical formula for butane

- its molecular formula is C4H10
- so its empirical is C2H5


what would be the structural and skeletal formulae for chloroethane

- CH3-CH2-Cl
- /\