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C5 Chemicals of the natural environment ­ checklist

What types of chemicals make up the atmosphere and
C5.1
hydrosphere?

What types of chemicals make up the atmosphere?

Know that dry air consists of the elements oxygen, nitrogen
1.
and argon and compounds such as carbon dioxide.

2. Know the formulae…

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Understand that ions in a crystal are held together by the
15. attraction between opposite charges (+ and): this is ionic
bonding. Met in C4.

Understand the physical properties of ionic compounds (high
melting and boiling points and electrical conductors in solution
16. or molten) are because of their giant,…

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Know that silicon dioxide is found as quartz in granite, and is
28.
the main constituent of sandstone.

29. Know that diamond consists of only one element, carbon.

Know the properties of diamond (limited to hardness, melting
30.
point and conductivity).

Explain the properties of diamond in terms of a…

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Extraction of metals using electrolysis.

Understand that some more reactive metals are extracted by
43. electrolysis because their oxide would not be reduced by
carbon (e.g. aluminium, sodium)

Describe electrolysis as the decomposition of an electrolyte
44.
with an electric current

Understand that electrolytes are solutions of ionic compounds
45.…

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Understand that in a metal crystal there are positively charged
59. ions held closely together by a sea of electrons that are free to
move. H.

Use data to answer questions about the impact on the
60.
environment of extraction, use and disposal of metals

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