Name: ______________________________________
Worksheet – Solids
1. Define the following:
Amorphous solid - solid without a regular repeating 3-dimensional structure
Crystalline solid – solid with a regular repeating 3-dimensional structure
Ionic crystal – crystal with ions at the lattice points, have high melting points
Molecular crystal – crystal with molecules at lattice points, held together by intermolecular forces, have lower
melting points than ionic crystals
Covalent network – crystal with atoms at lattice points that are covalently bonded to each other, very hard
solids, an example is a diamond
Metallic crystal – crystal with metal atoms at lattice points, the outer electrons move freely throughout the
crystal enabling it to conduct electricity
2. Define Heat of Fusion and Heat of Vaporization.
Heat of fusion – amount of heat energy needed to convert a solid to a liquid at its melting point
Heat of vaporization – amount of heat energy needed to convert a liquid to a vapor at its boiling point – heat of
vaporization is always greater than heat of fusion
3. Diagram the changes of state with respect to Temperature and Heat Added – include physical states and transitions.