7 Written questions
6 Multiple choice questions
- When light falls on a metal it is almost totally absorbed since the bonding electrons can jump up to a broad band of energy levels allowing energy changes corresponding to the full range of frequencies in the visible region of the spectrum.
These currents immediately re-emit the light out of the metal thus providing a strong reflection if the metal surface is smooth.
- Non-conductive (insulators): ions are pinned by the rigid lattice.
- density is usually between that of the component metals; alloy remains malleable and ductile
- formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms
- Soluble: the charged ions interact with the dipoles on the water molecules.
- 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
Brittleness of an ionic solid → Brittle: due to the repulsion of like charges caused when one layer slides across another layer.
Identification of an ionic solid → Unable to conduct electricity as a solid; soluble in water; aqueous solution conducts electricity
Alloys → Metallic mixtures
Malleability and ductility of an ionic solid → Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
Hardness of an ionic solid → Brittle: due to the repulsion of like charges caused when one layer slides across another layer.
Substitutional Alloy (definition) → formed between atoms of comparable radius, where one atom substitutes for the other in the lattice