Polymers and giant covalent structures

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12 Terms

1
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What is a polymer?

Long chains of repeating units

2
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What’s bonds do polymers have?

Covalent bonds

3
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How do you draw a repeating unit?

  • The repeating unit drawn in brackets

  • subscript value of n for how many times its repeated

<ul><li><p>The repeating unit drawn in brackets</p></li><li><p>subscript value of n for how many times its repeated</p></li></ul><p></p>
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How do you get the molecular formula from a repeating unit of a polymer?

Write down the molecular formula of the repeating unit in brackets and put an n on the outside (C2H4)n

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Why are most polymers a solid at room temperature?

The intermolecular forces between the polymer molecules are larger than between simple covalent molecules, so more energy is needed to break them

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Why are the boiling points of polymers lower than ionic or giant molecular compounds?

The intermolecular forces are still weaker than ionic or covalent bonds.

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What are giant covalent structures called?

Macromolecules

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How are molecules bonded I giant covalent structures?

all the atoms are bonded together by strong covalent bonds

9
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Do giant covalent structures have a low or high boiling or melting point and why?

Very high because a lot of energy is needed to break the strong covalent bonds

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Explain the structure of diamond.

Each carbon atoms forms four covalent bonds in a very rigid giant covalent structure

<p>Each carbon atoms forms four covalent bonds in a very rigid giant covalent structure</p>
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Explain the structure of graphite.

Each carbon atom forms three covalent bonds to create layers of hexagons. Each carbon atom also has one delocalised electron

<p>Each carbon atom forms three covalent bonds to create layers of hexagons. Each carbon atom also has one delocalised electron</p>
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What is sand made of?

  • Silicon dioxide

  • Each grain of sand is one giant structure of silicon and oxygen