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OCR GCSE Chemistry Structure

Structure

This page covers the following topics:

Ionic compounds form giant crystalline ionic lattices, held together by the strong electrostatic forces of attraction between the oppositely charged ions. The stronger this attraction, the higher the melting point of the ionic compound. If the ions in the lattice are free to move then the compound can conduct electricity.

Ionic compounds

Small molecules are held together by strong covalent bonds, but weak intermolecular interactions so they're usually gases or liquids at room temperature.

Small molecules

Some elements form giant covalent lattices which are large structures with multiple atoms joined together by covalent bonds. These lattices have exceptionally high melting and boiling points. The layout of the atoms in these structures also determines the physical properties of the compound, ie. hardness, density.

Giant covalent structures

Metals form large structures held together by metallic bonding. Pure metals are usually very soft and malleable, so different metallic elements are mixed to form alloys with preferable properties.

Metals and alloys

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Explain the difference in melting point between these two ionic compounds.

OCR GCSE Chemistry Structure Explain the difference in melting point between these two ionic compounds.
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2

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Order these ionic compounds in order of increasing melting point, CaO, KCl and MgFβ‚‚.

OCR GCSE Chemistry Structure Order these ionic compounds in order of increasing melting point, CaO, KCl and MgFβ‚‚.
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3

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What type of interatomic bonds hold together small molecules like COβ‚‚?

OCR GCSE Chemistry Structure What type of interatomic bonds hold together small molecules like COβ‚‚?
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4

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Draw a dot-and-cross diagram showing the covalent bond formed in Hβ‚‚.

OCR GCSE Chemistry Structure Draw a dot-and-cross diagram showing the covalent bond formed in Hβ‚‚.
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5

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Draw a dot-and-cross diagram of methane, CHβ‚„.

OCR GCSE Chemistry Structure Draw a dot-and-cross diagram of methane, CHβ‚„.
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6

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What physical state are giant covalent lattices at room temperature?

OCR GCSE Chemistry Structure What physical state are giant covalent lattices at room temperature?
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7

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Why is SiOβ‚‚ a solid at room temperature?

OCR GCSE Chemistry Structure Why is SiOβ‚‚ a solid at room temperature?
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8

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Why is graphite used in pencils?

OCR GCSE Chemistry Structure Why is graphite used in pencils?
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9

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Stainless steel is an alloy made of chromium and iron. What special properties does this alloy have compared to the pure forms of the metal?

OCR GCSE Chemistry Structure Stainless steel is an alloy made of chromium and iron. What special properties does this alloy have compared to the pure forms of the metal?
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10

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Can alloys conduct electricity?

OCR GCSE Chemistry Structure Can alloys conduct electricity?
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