Sheng Siong Supermarket is the place that we decided to go.Our task is to find products that are categorised under homologous series.Examples of homologous series are Alkene,Alkane,Alcohol and Carboxylic acid.The main purpose of completing this task is to learn more about organic chemistry.

Here is a brief explanation of homologous series:

Homologous series is a series of organic compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group, and shows a gradation in physical properties as a result of increase in molecular size and mass.For example, ethane has a higher boiling point than methane since it has more Van der Waals forces(intermolecular forces) with neighbouring molecules. This is due to the increase in the number of atoms making up the molecule. Organic compounds in the same homologous series vary by a CH2.

Alkene

Item: Palmolive

Uses: It is a shower gel for massage

Substances available: butylene, ethylene

What is butylene?

Butene, also known as butylene, is an alkene with the formula C4H8. It is a colourless gas that is present in crude oil as a minor constituent in quantities that are too small for viable extraction.

Ethylene, also known as ethene, is an alkene with the formula C2H4. It contains a carbon-carbon double bond, ethylene is called an unsaturated hydrocarbon. And it is a colourless gas.

Item: EverSoft Shower Foam

Uses: It is a shower foam for hair

Substances available: propylene, styrene

Propylene, also known as propene, is an unsaturated organic compound having the chemical formula C3H6. It has one double bond, and is the second simplest member of the alkene class of hydrocarbons, and it is also second in natural abundance.

Styrene, also known as phenylethene, is an organic compound with the chemical formula C6H5CH=CH2. Under normal conditions, this aromatic hydrocarbon is an oily liquid. It evaporates easily and has a sweet smell, although high concentrations confer a less pleasant odor. Styrene is the precursor to polystyrene, an important synthetic material.

Item: Loreal Sculpting Mousse




Structure of Butane














What is isobutane?
Isobutane, also known as methylpropane or 2-methylpropane, is an alkane, isomeric with butane.

Propane is an alkane with the formula C3H8. It is a three-carbon alkane, normally a gas, but compressible to a transportable liquid.

Alcohol

Item: Gold Cow

Uses: For drinking

Substance available: dexpanthenol

Dexpanthenol,also known as panthenol is the alcohol analog of pantothenic acid. The molecular formula is C9H19NO4.

Item: Loreal Sculpting Mousse

Uses: It is used to style the hair

Substance available: phenoxyethanol

Phenoxyethanol is an organic chemical compound, a glycol ether often used in dermatological products such as skin creams and sunscreen. It is a colorless oily liquid. The molecular formula is C8H10O2.

Item: Garlic Chilli

Uses: It is used for ingredients of food

Substance available: acetic acid

Acetic acid, CH3COOH, also known as ethanoic acid, is an organic acid which gives vinegar its sour taste and pungent smell.

Structure of Ethanoic acid

Item: Wang Wang Milk

Uses: For drinking

Substance available: docosahexaenoic acid

What is docosahexaenoic acid?

Docosahexaenoic acid, commonly known as DHA, is a carboxylic acid with a 22-carbon chain and six cis double bonds; the first double bond is located at the third carbon from the omega end.

Structure of Docosahexaenoic acid

Item: Horlick

Uses: For drinking

Substance available: pantothenic acid

What is pantothenic acid?

Pantothenic acid, also called vitamin B5 (a B vitamin), is a water-soluble vitamin required to sustain life. The molecular formula is C9H17NO5.

Item: Promil Gold

Uses: For babies to drink

Substance available: arachiodonic acid

What is arachidonic acid?

Arachidonic acid is a carboxylic acid with a 20-carbon chain and four cis double bonds; the first double bond is located at the sixth carbon from the omega end. The molecular formula is C20H32O2.