Lab 9

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Chemistry

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Dec 6, 2023

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Name: Kendall Widdel E-mail address: kwiddel@vols.utk.edu Laboratory 9 Report The purpose of this experiment is to understand temperature and how it is affected and what factors can change heat and the same goes with ice. Discussion 1 Do you agree or disagree with the following statements? Explain why you agree or disagree.  (a) Heat flows from the 1.0 kg mass to the 3.0 kg mass because the 1.0 kg mass has a much larger heat capacity. I disagree with this statement because heat doesn’t flow 1kg and 3kg because 1 kg is 100 degrees Celsius and 3kg is 160 degrees Celsius. This shows that the higher-temperature object flows to the object with the lower temperature.  (b) The thermal energy lost by the 3.0 kg mass is greater than the thermal energy gained by the 1.0 kg mass. I disagree with this statement because even though the 3kg object loses thermal energy, it is canceled out by the energy it gains from the 1kg Experiment mass of cup (kg) m cup 0.0039 mass of cup + water (kg) m cup + m w 0.1639 mass of cup + water + ice (kg) m cup + m w + m ice 0.2838 mass of water (kg) m w 0.1604 mass of ice (kg) m ice 0.1234 initial temperature of water ( o C) T i 43.8

final temperature of water ( o C) T f 8.8 latent heat of fusion (kcal/kg) L f (measured) 76.95 latent heat of fusion (kcal/kg) L f (accepted) 80  Determine the latent heat of fusion, L f , from your data and compare with the accepted value. Paste your table into your Word document. The latent heat fusion is 76.95 kcal/kg and the accepted value is around the same at 80kcal/kg  What are some of the experimental errors that could cause your measured value of L f to differ from the accepted value? Experimental errors that could cause the measured value to differ from the accepted value are calculation errors, or experimental errors like not zeroing out the scale.  Why is it important to dry the ice before adding it to the water? It is important to dry the ice before adding it to the water because it can affect the results as there would be left over water on the ice Exercise I did verify Charles law because it was somewhat of a straight line Compare the average kinetic energies of the two types of particles. Explain your results. The kinetic energies are very similar within the two types of particles

Discussion 2  For environmental temperature below 32 o C, convection and radiation are the dominant heat removal mechanisms. What can a person do to increase the amount of heat carried away by these mechanisms? A person can wear baggy clothing to allow more airflow taking the heat away from the body and allow more skin showing  Why is conduction usually not a dominant heat removal mechanism? Can you think of situations when it becomes important? Conduction is usually not a dominate heat removal mechanism because when it is put against convection, convection is favored  Why do convection and radiation no longer remove heat from the body at environmental temperature above 37 o C? Convection and radiation no longer remove heat from the body at environmental temperature above 37 degrees because this is a normal body temperature  If there is a cool wind blowing, what would be the consequences, as far as heat loss from the body is concerned, of wearing wet clothes? Explain your answer. The combination of cool wind and the wet clothes would casue the body to lose heat faster then if the clothes were dry  Cloudy nights are usually warmer than cloudless nights. Why? This is because clouds absorb heat so by the time the sun goes down there is still heat present. Making cloudy nights warmer than cloudless nights. Discussion This experiment was an easier one for me because I have done a similar experiment with the ice while in person so I was able to understand what we were doing without having

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to be in person. The PHET portion of the experiment I struggled with as it is a new program for me and would appreciate it if there was an instruction video to help me understand the correct buttons to accurately complete the assignment

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