Questions and Answers
Which would be classified as a natural polymer?
A polymer is a large molecule:
A monomer is a:
Which would be classified as a synthetic polymer?
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Which of these statements are correct for addition polymerization only? (Select all that apply)
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How are HDPE and LDPE different?
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Nathaniel Wyeth developed plastic soft drink bottles. They are made from which polymer?
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Polyvinyl chloride (PVC) is used in:
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The Big Six polymers are all classified as thermoplastics because they:
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Which polymer is incorrectly matched with its use?
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The molecules that are added to polymers to make them softer and more pliable are known as:
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What do the letters HDPE represent?
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Why is crude oil currently the only raw material from which synthetic polymers can be made?
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Will synthetic polymers always have to be made from crude oil?
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This represents a step in the addition polymerization of ethylene. What do chemists call the species 'R'?
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Which statement is false?
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Which one is not a polymer?
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Study Notes
Natural and Synthetic Polymers
- Natural polymer example: cellulose
- Synthetic polymer example: nylon
Definition of Polymers
- A polymer consists of long chains of atoms covalently bonded.
Definition of Monomers
- A monomer is a small molecule that forms polymer chains.
Addition Polymerization
- Monomer units bond together without losing any atoms, generating a product that retains all the original atoms.
- Incorrect statement: Condensation polymerization involves the loss of small molecules like water.
Polymer Classifications
- HDPE and LDPE differ structurally; HDPE has linear chains, whereas LDPE has branched chains.
- The Big Six polymers are classified as thermoplastics due to their ability to be melted and reshaped.
Specific Polymers and Their Uses
- PET is used for soft drink bottles.
- PVC is commonly used in plumbing pipes.
- Incorrect use association: PS (polystyrene) is not used for contact lenses.
Enhancements for Polymers
- Plasticizers are additives used to make polymers softer and more pliable.
High-Density Polyethylene
- HDPE stands for high density polyethylene, significant in plastic manufacturing.
Raw Materials for Synthetic Polymers
- Crude oil is the primary raw material due to its convenience and cost-effectiveness.
- New technologies aim to use bio-based raw materials, reducing reliance on crude oil.
Free Radicals in Polymerization
- In the addition polymerization process, species denoted as "R" are referred to as radicals.
Identifying Polymers
- Polytech is not a polymer compared to polyethylene, polystyrene, and polyvinyl chloride.
Polymer Structure
- Polymers exhibit regions where molecules are neatly and tightly arranged in a regular pattern.
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Description
Test your knowledge of polymers with these flashcards from Chapter 9 of Chemistry in Context. Identify natural polymers and understand the structure of large molecules. Perfect for reviewing key concepts in materials chemistry.