Assignment: Latent Heat and Specific Heat
PRE-LAB QUESTIONS
• Water and steam are both 100 ºC when water is boiling, but a burn from steam is worse than a burn from the water. Hypothesize why this is true.
• A 10 g ice cube, initially at 0 ºC, is melted in 100 g of water that was initially 20 ºC. After the ice has melted, the equilibrium temperature is 10.93 ºC. Calculate:
o The total heat lost by the water (the specific heat for water is 4.186 J/g/K).
o The heat gained by the ice cube after it melts (the specific heat for ice is 2.093 J/g/K).
o The heat it took to melt the ice (Hint: it takes 334 J of heat energy to melt 1 g of ice)
• Inside a calorimeter is 100 g of water at 39.8 ºC. A 10 g object at 50 ºC is placed inside of a calorimeter. When equilibrium has been reached the new temperature of the water and metal object is 40 ºC. What type of metal is the object made from?
EXPERIMENT 1: LATENT HEAT
|
Time (s)
|
Temperature (°C)
|
Observation
|
|
0
|
|
|
|
5
|
|
|
|
10
|
|
|
|
15
|
|
|
|
20
|
|
|
|
25
|
|
|
|
30
|
|
|
Table 3: Temperature of Boiling Water over Time
|
Time (min.)
|
Boiling Temperature (°C)
|
|
1
|
|
|
5
|
|
Post-Lab Questions
• Describe what happened to the temperature of the water as it was melting.
• Hypothesize how the temperature of the water changed as it was freezing.
• What happened to the temperature of the water after it melted?
• What happened to the temperature of the water as it was heating?
• What happened to the temperature of the water after it started boiling?
• What was the temperature of your boiling water? The standard boiling temperature for water is 100 °C. Does your measurement agree with this? Explain why or why not.
• Explain why temperature does not change during a phase change. Where does the heat energy go if not into increasing or decreasing temperature?
Format your assignment according to the give formatting requirements:
• The answer must be using Times New Roman font (size 12), double spaced, typed, with one-inch margins on all sides.
• The response also includes a cover page containing the student's name, the title of the assignment, the course title, and the date. The cover page is not included in the required page length.
• Also include a reference page. The references and Citations should follow APA format. The reference page is not included in the required page length.