7 Written questions
6 Multiple choice questions
- Non-conductive (insulators): ions are pinned by the rigid lattice.
- interstitial atoms do not appreciably expand the lattice and so density is often substantially increased; interstitial atoms make the lattice more rigid reducing ductility and malleability
- Brittle: due to the repulsion of like charges caused when one layer slides across another layer.
- Alloy formation sometimes alters the chemistry such as the formation of a chemically inert oxide layer in stainless steel.
- Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
- Insoluble: ionic compounds tend not to dissolve in nonpolar solvents because the attractions between ions are much more favorable than the attractions among the separated ions and nonpolar solvent molecules.
6 True/False questions
Substitutional Alloy (properties) → formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
Malleability and ductility of an ionic solid → Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
Identification of an ionic solid → Non-conductive (insulators): ions are pinned by the rigid lattice.
Vapor pressure an of ionic solid → Very Low: due to the strong Coulombic interactions of positive and negative ions arranged in a regular three-dimensional array.
Optical properties of metals (list and reason) → Shiny, reflective, lustrous: because electrons move freely throughout the metal. Metals are shiny because of the very strong absorption of light by the delocalised bonding electrons.
Conductivity of alloys → Non-conductive (insulators): ions are pinned by the rigid lattice.