2. Atoms, elements and compounds
A section of Chemistry, 0620
Listing 10 of 864 questions
For Examiner's Use The first three elements in Group IV are carbon, silicon and germanium. The elements and their compounds have similar properties. The compound, silicon carbide, has a macromolecular structure similar to that of diamond. A major use of silicon carbide is to reinforce aluminium alloys which are used in the construction of spacecraft. Suggest three of its physical properties. Complete the following description of the structure of silicon carbide. Each carbon atom is bonded to four atoms. Each silicon atom is bonded to carbon atoms. Germanium(oxide, GeO2, has the same macromolecular structure as silicon(oxide. Draw the structural formula of germanium(oxide. For Examiner's Use Germanium forms a series of hydrides comparable to the alkanes. Draw the structural formula of the hydride which contains four germanium atoms per molecule. Predict the products of the complete combustion of this hydride.
0620_w09_qp_31
THEORY
2009
Paper 3, Variant 1
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For Examiner's Use The first three elements in Group IV are carbon, silicon and germanium. The elements and their compounds have similar properties. The compound, silicon carbide, has a macromolecular structure similar to that of diamond. A major use of silicon carbide is to reinforce aluminium alloys which are used in the construction of spacecraft. Suggest three of its physical properties. Draw a diagram to show the arrangement of silicon atoms around one carbon atom in silicon carbide. Label this diagram 1. Draw a diagram to show the arrangement of carbon atoms around one silicon atom in silicon carbide. Label this diagram 2. Germanium(oxide, GeO2, has the same macromolecular structure as silicon(oxide. Draw the structural formula of germanium(oxide. For Examiner's Use Germanium forms a series of hydrides comparable to the alkanes. Draw the structural formula of the hydride which contains three germanium atoms per molecule. Predict the products of the complete combustion of this hydride.
0620_w09_qp_32
THEORY
2009
Paper 3, Variant 2
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Silicon(oxide, SiO2, and zirconium(oxide, ZrO2, are both macromolecules. They have similar physical properties but silicon(oxide is acidic and zirconium(oxide is amphoteric. Defi ne the term macromolecule. Predict three physical properties of these two oxides. Name an element which has the same physical properties as these two oxides. Name a reagent that reacts with the oxides of both elements. Name a reagent that reacts with only one of the oxides. reagent oxide which reacts
0620_w12_qp_31
THEORY
2012
Paper 3, Variant 1
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864