7 Written questions
6 Multiple choice questions
- Poor: ionic lattices are rigid and once broken tend to cleave along an entire plane.
- Malleable and ductile: deforming the solid does not change the environment immediately surrounding each metal core
- formed between atoms of comparable radius, where one atom substitutes for the other in the lattice
- 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.
- Very Low: due to the strong Coulombic interactions of positive and negative ions arranged in a regular three-dimensional array.
- Metallic mixtures
6 True/False questions
Hardness of an ionic solid → Hard: ionic lattice is strong and rigid
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
Substitutional Alloy (properties) → density is usually between that of the component metals; alloy remains malleable and ductile
Water solubility of an ionic solid → Soluble: the charged ions interact with the dipoles on the water molecules.
Interstitial Alloy (definition) → formed between atoms of different radius, where the smaller atoms fill the interstitial spaces between the larger atoms
Conductivity of alloys → Good: alloys usually retain a sea of mobile electrons (delocalized covalent bonds) and so remain conducting (for both HEAT and ELECTRICITY)