A1 Materials Science: Introduction
1. 1.
What do you understand by a composite material? Choose a named example to illustrate your answer.
2. 2.
Explain, in terms of bonding and packing arrangements of aluminium foil and paper, why you might choose to pack sandwiches in aluminium foil, rather than paper.
3. 3.
Various metal oxides are added to the mixture in the production of ceramics including calcium oxide
$\textsf{CaO}$
and copper oxide
$\textsf{CuO}$
. The reason for adding them is related to the type of bonding present in the compound. Use section 8 of the IB Data Booklet to calculate values which complete the table below.
Compound
Calcium oxide
Copper (II) oxide
Electronegativity difference
Average electronegativity
Predict the bond type and percentage covalent character of each oxide using section 29 of the IB data booklet.
Compound
Calcium oxide
Copper (II) oxide
Bond type
% covalent character