7 Written questions
6 Multiple choice questions
- formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
- formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms
- 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.
- Alloy formation sometimes alters the chemistry such as the formation of a chemically inert oxide layer in stainless steel.
- Soluble: the charged ions interact with the dipoles on the water molecules.
- Non-conductive (insulators): ions are pinned by the rigid lattice.
6 True/False questions
Interstitial Alloy (properties) → 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
Non-polar solubility of an ionic solid → 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.
Identification of an ionic solid → Non-conductive (insulators): ions are pinned by the rigid lattice.
Malleability and ductility of a metallic solid → Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
Substitutional Alloy (properties) → formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
Vapor pressure an of ionic solid → Hard: ionic lattice is strong and rigid