Starter quiz
- Which type of bond is present in alkenes that is not present in alkanes?
- single ionic
- double covalent ✓
- triple covalent
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- Which type of bond involves the sharing of electrons between atoms?
- ionic
- covalent ✓
- metallic
- hydrogen
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- Which of the following is a simple covalent molecule?
- diamond
- graphite
- water ✓
- sodium chloride
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- Which of the following properties do simple covalent molecules have in common?
- low boiling point ✓
- high melting point
- good electrical conductor
- solid at room temperature
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- Why do simple covalent molecules generally have low boiling points?
- They have strong ionic bonds within the molecules.
- They have weak intermolecular forces. ✓
- They have strong covalent bonds within the molecules.
- They are made of large molecules.
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- Match the following key terms to their definition.
- polymers⇔long–chained molecules formed by joining together small molecules ✓
- monomers⇔small molecules that can join together to form long–chained molecules ✓
- repeating unit⇔the section of a polymer that repeats ✓
- polymerisation⇔the process of small molecules joining to form long–chained molecules ✓
Exit quiz
- What is the key term used to describe the small molecules that can join together to form a polymer?
- 'monomers' ✓
- Which of the following is the term for the reaction that forms polymers from monomers?
- hydrolysis
- polymerisation ✓
- combustion
- cracking
- fractional distillation
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- What are polymers?
- small molecules with ionic bonds
- large covalent molecules made of repeating units ✓
- metals with giant structures
- simple molecules with low boiling points
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What is shown in the image?- a monomer ✓
- a repeating unit
- a polymer
- polymerisation
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- Which of the following types of bond is found within the repeating units of a polymer formed from alkenes?
- metallic
- ionic
- covalent ✓
- hydrogen
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- Why are polymers solid at room temperature?
- They have strong ionic bonds between the molecules.
- They have strong covalent bonds within the molecules.
- The intermolecular forces between polymer molecules are relatively strong. ✓
- They have strong covalent bonds between the molecules.
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Polymers are very large covalent molecules (not giant structures)
- Polymers can be represented by showing repeated units
- Polymers consist of repeating and identical sections called monomers
- Polymers are solid at room temperature because the intermolecular forces between polymer molecules are relatively strong
Common misconception
Not including the bonds either side of the repeating unit.
The slide deck states the need for open bonds to show how repeating units are bonded to each other.
Keywords
Polymer - Polymers are long-chained molecules formed by joining together monomers.
Monomer - Monomers are small molecules that can join together to form a polymer.
Repeating unit - The section of a polymer that repeats is known as the repeating unit.
Intermolecular forces - Intermolecular forces are weak forces of attraction between molecules, and molecular substances.
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