LEARNING TASK 1
Answer the following questions:
What are alkenes used for?
Where is alkene found?
What are the characteristics of alkenes? Do alkenes have higher boiling points? Can alkenes be used as fuel?
How do you test for an alkene?
How do alkenes react?
Why are alkanes called paraffins?
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Answer:
What are alkenes used for?
In manufacturing, alkenes find many different applications. They are used in the synthesis of alcohols, plastics, lacquers, detergents, and fuels as starting materials. For the chemical industry, the most important alkenes are ethene, propene, and 1,3-butadiene.
Where is alkene found?
It can be produced by thermal cracking of ethane to produce ethene and a hydrogen molecule. Alkenes are the raw materials for a number of plastics such as polyethylene, PVC, polypropylene, and polystyrene. Alkene chemistry is found in unsaturated fats, beta-carotene, and seeing light through vision.
What are the characteristics of alkenes?
Physical Properties of Alkenes
Alkenes are non-polar, and they are both immiscible in water and less dense than water. They are generally soluble in organic solvents. In addition, they do not conduct electricity.
Do alkenes have higher boiling points?
The boiling point of each alkene is very similar to that of the alkane with the same number of carbon atoms. ... The more intermolecular mass is added, the higher the boiling point. Intermolecular forces of alkenes gets stronger with increase in the size of the molecules.
Can alkenes be used as fuel?
Alkenes readily burn, just like alkanes, to give carbon dioxide and water if combustion is complete e.g. However, they are NOT used as fuels for two reasons. They are far too valuable for use to make plastics, anti–freeze and numerous other useful compounds.
How do you test for an alkene?
Unsaturated molecules are called alkenes. It is possible to use a basic bromine water test to know the difference between an alkane and an alkene. If the bromine reacts with the carbon-carbon double bond, the alkene can turn brown bromine water colourless. With alkenes and alkynes, bromine reacts quickly.
How do alkenes react?
Alkenes are relatively stable compounds, but are more reactive than alkanes because of the reactivity of the carbon–carbon π-bond. Most reactions of alkenes involve additions to this π bond, forming new single bonds. The carbon-carbon double bond in alkenes such as ethene react with concentrated sulfuric acid
Why are alkanes called paraffins?
Paraffin is a truncation of Latin 'parum affinum' meaning 'less affinity' i.e. 'less reactivity'. Alkanes have only single bonds which are sigma covalent. ... Hence, alkanes are called paraffins because they have lesser affinity towards general reagents.
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