1. When the cooling curve for naphthalene is plotted on a graph of temperature (in oC) vs. time (in minutes), the following three regions are observed: in the first 2 minutes, the temperature drops from 90oC to 80oC; in the next 6 minutes, the temperature remains constant at 80oC; and in the last 4 minutes, the temperature falls from 80oC to 60oC. The naphthalene is a mixture of liquid and solid in the time interval from _______.   2 to 8 minutes   8 to 12 minutes   0 to 2 minutes   Hint Half-n-half Clue   2. The heat gained or lost by a body during a change of state is referred to as _______ heat since there is no change in temperature.   latent   sensible   specific   Half-n-half Clue   3. The process by which a _______ changes into its gaseous state at a certain fixed temperature by the absorption of heat is called vaporization.   solid   liquid   4. In an experiment, a thin copper wire with weights at either end is placed on a supported block of ice. The thin wire is observed to pass through the ice. The experiment shows that an increase in _______.   specific latent heat causes the freezing point of water to drop below 0o   specific latent heat causes the freezing point of water to rise above 0o   pressure causes the freezing point of water to drop below 0o   pressure causes the freezing point of water to rise above 0o   Half-n-half Clue   5. The heat gained or lost by a body during a change of state is the product of its _______ and the specific latent heat.   Weight   Mass   Volume   Half-n-half Clue   6. The process by which a solid changes into its liquid state at a certain fixed temperature by the absorption of heat is called _______.   liquefaction   vaporization   solidification   fusion   Half-n-half Clue   7. The process by which a liquid changes into its solid state at a certain fixed temperature by the _______ of heat is called solidification.   absorption   liberation