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1. particles in a gas are best described as
• slow-moving, kinetic, hard spheres
• small, hard spheres with insignificant volumes
2. how does the atmospheric pressure at altitudes below sea level compare with atmospheric pressure at sea level?
• the atmospheric pressure below sea level is higher.
3. when a gas is heated,
• some of the absorbed energy is converted to potential energy, and some is converted to kinetic energy
• none of the energy is converted to kinetic energy
4. why does a liquid's rate of evaporation increase when the liquid is heated?
• more molecules have enough energy to overcome the attractive forces holding them in the liquid.
• the average kinetic energy of the liquid decreases.
5. crystals are characterized by particular patterns that repeat in how many dimensions?
• three dimensions only
• the patterns do not repeat.
6. compared to the melting points of ionic compounds, the melting points of molecular solids tend to be
• lower
• higher
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