University:
Eastern Kentucky University
Course:
CHE 111 | General Chemistry
Academic year:

2020
Views:

198

Pages:

2
Author:

Alexa Livingston

Heating Curve Worksheet Name: Date: The diagram below is a plot of temperature vs. time. It represents the heating of what is initially ice at -10oC at a near constant rate of heat transfer. 1) a)What phase or phases are present during segment (1) _______________________________________ b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________ c) What phase change, if any, is taking place? _____________________________________________ 2) a)What phase or phases are present during segment (2) _______________________________________ b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________ c) What phase change, if any, is taking place? _____________________________________________ 3) a)What phase or phases are present during segment (3) _______________________________________ b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________ c) What phase change, if any, is taking place? _____________________________________________ 4) a)What phase or phases are present during segment (4) _______________________________________ b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________ c) What phase change, if any, is taking place? _____________________________________________ 5) a)What phase or phases are present during segment (5) _______________________________________ b) What is happening to the energy being absorbed from the heat source? (answer in terms of potential and/or kinetic energy) ________________________________________________________________ __________________________________________________________________________________ c) What phase change, if any, is taking place? _____________________________________________ 6) What is the melting point of this substance? 7) At what temperature would this sample finish boiling? 8) a. b. c. d. When this substance is melting, the temperature of the ice-water mixture remains constant because: Heat is not being absorbed The ice is colder that the water Heat energy is being converted to potential energy Heat energy is being converted to kinetic energy 9) When a given quantity of water is heated at a constant rate, the phase change from liquid to gas takes longer than the phase change from solid to liquid because a. The heat of vaporization is greater than the heat of fusion b. The heat of fusion is greater than the heat of vaporization c. The average kinetic energy of the molecules is greater in steam than in water d. Ice absorbs energy more rapidly than water does