CO2+Heat+Profile

Name: Date: Block: Heat Profile of Carbon Dioxide A student started with a solid block of a chemical compound. They continuously added heat to the object and collected its temperature at one minute intervals. Graph the following data. Be sure to follow all graphing rules. Minutes || 0 || 1 || 2 || 3 || 4 || 5 || 6 || 7 || 8 || 9 || 10 || 11 || 12 || 13 || 14 || 15 || 16 || 17 || 18 || 19 || 20 || (oC) || -85 || -82 || -80 || -78 || -78 || -78 || -76 || -74 || -72 || -70 || -68 || -66 || -64 || -62 || -60 || -58 || -57 || -57 || -57 || -57 || -55 ||
 * Time
 * Temperature



Data Analysis:
 * 1) What is carbon dioxide’s melting point?
 * 2) What is its boiling point?
 * 3) On your graph identify the location of carbon dioxide as a solid, liquid, and gas.
 * 4) Calculate the slope of the line during the liquid state of carbon dioxide. (Show your Work)

Conclusions:
 * 1) The slope of the line is called Specific Heat. It is a measure of how much energy is required to raise one gram of a substance by 1oC. Water has a specific heat of 1oC/gram. Would water’s slope be steeper or more gradual than carbon dioxide’s? Explain your reasoning.
 * 1) How are melting and freezing different from each other?


 * 1) Which takes more energy, turning carbon dioxide from a solid into a liquid(Heat of Fusion) or from a liquid to a gas (Heat of Vaporization)? Explain your reasoning.


 * 1) Sublimation is the process of turning directly from a solid to a gas without becoming a liquid. At normal earth atmospheric pressures, carbon dioxide cannot be a liquid. It simply sublimates. Use a dotted line and draw a hypothesized line on your graph that would show carbon dioxide sublimating.


 * 1) Carbon dioxide is a great Greenhouse Gas, trapping lots of heat in the atmosphere. Mars has lots of solid carbon dioxide (Dry Ice) on its surface, but it is too cold for humans to live there. Describe a process NASA might use to make Mars warmer. Use information from the heat profile to help prove your point.