Bonding questions - materials self test PDF

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MATS1101/MATS9520 Self Test Questions Week 1 1. In solids the atoms are held together by interatomic bonds. These bonds can be produced by: (a) sharing of valence electrons amongst all atoms (b) sharing of valency electrons amongst a small group of atoms (c) donation of valency electrons from one atom to another (d) weak dipole forces produced between neighbouring atoms (e) all of the above 2. The metallic bond involves: (a) sharing of valence electrons with all atoms (b) sharing of valency electrons amongst a small group of atoms (c) donation of valency electrons from one atom to another (d) weak dipole forces produced between neighbouring atoms (e) all of the above 3. In covalent bonded materials: (a) valence electrons are shared by all atoms (b) valency electrons are shared amongst a small group of atoms (c) valency electrons are donated from one atom to another (d) the bonds are the result of weak dipole forces between neighbouring atoms (e) both (a) and (c) 4. Bonding in ceramic materials can occur by: (a) sharing of valence electrons amongst all atoms (b) sharing of valency electrons amongst a small group of atoms (c) donation of valency electrons from one atom to another (d) weak dipole forces produced between neighbouring atoms (e) both (b) and (c) 5. The atoms that make up the backbone of polymer chains are held together by: (a) metallic bonds (b) covalent bonds (c) ionic bonds (d) secondary bonds (e) both (b) and (d) 6. Which material would be mostly likely to have the highest melting point: (a) a material in which metallic bonds are dominant (b) a material in which covalent bonds are dominant (c) a material in which ionic bonds are dominant (d) a material in which secondary bonds are dominant (e) a material with both mixed covalent and secondary bonds

7. Why do metals have good electrical conductivity 8. Why would you expect the atoms in a covalently bonded materials to have a lower packing density than in metallically bonded material? 9. What type of bonds occur in ceramic materials? 10. What type of bonds occur in polymers?...