Drawing Displayed Formulae
Chemistry: Cambridge International GCSE Supplement, topic 11.2.1
Naming Organic Compounds and Drawing Displayed Formulae
Draw displayed formulae for methane, ethane, ethene, ethanol, ethanoic acid, and reaction products like CO2, H2O, and dibromoethane.
Methane and ethane displayed formulae
- Methane is the simplest alkane with one carbon atom.
- Methane's formula is CH4.
- Draw methane with carbon in the centre and four hydrogen atoms around it.
- Ethane has two carbon atoms joined by a single bond.
- Ethane's formula is C2H6.
- Draw ethane showing two carbons connected and six hydrogens attached.
Ethene displayed formula
- Ethene is an alkene with two carbon atoms joined by a double bond.
- Ethene's formula is C2H4.
- Draw ethene showing the double bond between carbons.
- Attach four hydrogens, two on each carbon.
Ethanol and ethanoic acid displayed formulae
- Ethanol is an alcohol with the formula C2H5OH.
- Draw two carbons, five hydrogens, and an OH group attached.
- Ethanoic acid is a carboxylic acid with the formula CH3COOH.
- Draw ethanoic acid with a methyl group and the carboxyl group (COOH).
Products of combustion and addition
- Complete combustion of hydrocarbons produces carbon dioxide (CO2) and water (H2O).
- Draw CO2 with carbon double-bonded to two oxygens.
- Draw water (H2O) with oxygen bonded to two hydrogens.
- Reaction of ethene with bromine forms dibromoethane (C2H4Br2).
- Draw ethane structure with two bromine atoms replacing hydrogens.
Products of fermentation reactions
- Fermentation of sugars produces ethanol (C2H5OH) and carbon dioxide (CO2).
- Draw ethanol and carbon dioxide displayed formulae as before.
Test yourself on Drawing Displayed Formulae
What functional group is present in ethanol?