2.6. Giant covalent structures
A subsection of Chemistry, 5070, through 2. Atoms, elements and compounds
Listing 10 of 42 questions
Silicon is a non-metal found in Group IV of the Periodic Table. Silicon is manufactured by the reduction of silicon dioxide with carbon. SiO2 + 2C Si + 2CO What is the maximum mass of silicon that can be made from 300 g of silicon dioxide? mass of silicon g Silicon has a giant molecular structure. Suggest two physical properties of silicon. Silane has the molecular formula SiH4. Draw the ‘dot-and-cross’ diagram for silane. You only need to show the outer shell electrons of silicon. Using ideas about structure and bonding, suggest why silane has a low boiling point. Siloxanes are condensation polymers. The partial structure of a siloxane can be represented as shown. Si O O Si O Si CH3 CH3 CH3 CH3 CH3 CH3 O Si CH3 CH3 What is meant by the term condensation polymerisation? Draw the repeat unit of this siloxane. Butene forms an addition polymer called poly. C C H2C CH3 H H H butene Draw a partial structure for poly. You must show at least two repeat units.
5070_s18_qp_21
THEORY
2018
Paper 2, Variant 1
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