2.7. Metallic bonding
A subsection of Chemistry, 0620, through 2. Atoms, elements and compounds
Listing 10 of 17 questions
Gallium is a metallic element in Group III. It has similar properties to aluminium. Describe the structure and bonding in a metallic element. You should include a labelled diagram in your answer. Explain why metallic elements such as gallium are good conductors of electricity. Give the formula of gallium(chloride, gallium(sulfate. Gallium(oxide, Ga2O3, is amphoteric. Write the chemical equation for the reaction between gallium(oxide and dilute nitric acid to form a salt and water only. The reaction between gallium(oxide and sodium hydroxide solution forms only water and a salt containing the negative ion Ga2O4 2–. Write the chemical equation for this reaction. Alloys of gallium and other elements are often more useful than the metallic element itself. Suggest two reasons why alloys of gallium are more useful than the metallic element.
0620_s16_qp_42
THEORY
2016
Paper 4, Variant 2
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Some properties of four substances, A, B, C and D, are shown in the table. substance strength ductility (how easy it is to pull into a wire) hardness conductivity of heat A weak poor hard poor B strong not ductile very hard good C very strong very good hard good D weak poor soft good Answer these questions using only the information in the table. State which substance, A, B, C or D, is best used in the core of an overhead electricity cable. Explain your answer. substance explanation  State which substance, A, B, C or D, is best used for the tip of a drill. Explain your answer. substance explanation  
0620_w20_qp_31
THEORY
2020
Paper 3, Variant 1
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Questions Discovered
17