7 Written questions
6 Multiple choice questions
- Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
- 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.
- Hard: ionic lattice is strong and rigid
- density is usually between that of the component metals; alloy remains malleable and ductile
- 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
6 True/False questions
Substitutional Alloy (definition) → formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
Alloys → Good: alloys usually retain a sea of mobile electrons (delocalized covalent bonds) and so remain conducting (for both HEAT and ELECTRICITY)
Interstitial Alloy (definition) → formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms
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
Water solubility of an ionic solid → Soluble: the charged ions interact with the dipoles on the water molecules.
Conductivity of alloys → Good: alloys usually retain a sea of mobile electrons (delocalized covalent bonds) and so remain conducting (for both HEAT and ELECTRICITY)