Hydrocarbons
Lesson details
Learning outcome
I can describe alkanes and represent the first four by name, molecular formulae and displayed formulae.
Key learning points
- Hydrocarbons are simple covalent compounds made of hydrogen and carbon atoms only.
- Hydrocarbons are found in crude oil, and are used as fuels and feedstock.
- Alkanes consist of chains, or rings, of carbon atoms that are each also bonded to hydrogen atoms.
- Alkanes are a homologous series of hydrocarbons, with the same general formula with a trend in properties.
- The general formula for an alkane is CnH2n+2.
Keywords
Hydrocarbon - Simple covalent compounds made of carbon and hydrogen atoms only.
Feedstock - Raw materials used in chemical processes to produce other substances.
Alkane - Saturated hydrocarbons (have only single bonds between carbon and hydrogen atoms).
Homologous series - Compounds that have the same general formula, with neighbouring molecules often differing by CH₂, showing similar chemical properties and physical property trends.
Nomenclature - A collection of rules for naming things (in chemistry it refers to the naming of chemical substances).
Common misconception
Students often think that the prefix hydro- in the term hydrocarbons means they contain water; also that hydrocarbons and crude oil are synonymous.
Use diagrams to show hydrocarbon composition and compare crude oil to pure hydrocarbons, highlighting the difference visually.
Teacher tip
Incorporate real-world examples and experiments that show the broad use of hydrocarbons in everyday products, fostering a deeper understanding of organic chemistry's impact on technology and daily life.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of the following is a characteristic of molecular compounds?
Q2.In distillation, what characteristic is primarily used to separate substances in a mixture?
Q3.Carbon will form a maximum of bonds to other atoms.
Q4.When oxygen atoms bond together to make diatomic oxygen molecules (O₂), this is known as a double covalent bond.
Q5.Which property increases as the strength of intermolecular forces increases?
Q6.Select all the true statements about simple molecular substances.
Assessment exit quiz
6 Questions
Q1.Which elements make up hydrocarbons?
Q2.Which of the following are correct statements about compounds in the same homologous series?
Q3.Saturated hydrocarbons are called . They are saturated as they only contain single bonds between the carbon atoms.
Q4.Which of the following is not a use of hydrocarbons?
Q5.Which of the following is the correct general formula for alkanes?
Q6.Order the following hydrocarbons by carbon chain length. Start with the shortest carbon chain.
To help you plan your 10 chemistry lesson on: Hydrocarbons, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 10 chemistry lesson on: Hydrocarbons, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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