Phase changes of water - Oakland Schools

More documents

Recommendations

Info

Phase Changes Activity #6—Phase Change Problem Solving Lab Question to be investigated: How can you derive the heating curve for water? Objective: C5.4B Measure, plot and interpret the graph of a temperature vs. time graph of an ice water mixture, under slow heating, through melting and boiling. Materials: Graph paper Source: Buthelezi, T. et al. Glencoe Science Chemistry Matter and Change, Columbus, OH: The McGraw-Hill Companies, Inc.,2008. Procedure: Water molecules have a strong attraction to one another because they are polar. They form hydrogen bonds that affect water’s properties. The polarity of water accounts for its high specific heat and relatively high enthalpies of fusion and vaporization. Analysis: Use the data in the table to plot a heating curve of temperature vs. time for a 180 g sample of water as it is heated at a constant rate from -20 degrees Celsius to 120 degrees Celsius. Draw a best-fit line through the points. Note the time required for water to pass through each segment of the graph. Time (min) Temperature (degrees C) Time (min) Temperature (degrees C) 0.0 -20 13.0 100 1.0 0 14.0 100 2.0 0 15.0 100 3.0 9 16.0 100 4.0 26 17.0 100 5.0 42 18.0 100 6.0 58 19.0 100 7.0 71 20.0 100 8.0 83 21.0 100 9.0 92 22.0 100 10.0 98 23.0 100 11.0 100 24.0 100 12.0 100 25.0 120 44
Think Critically: Analyze each of the five regions of the graph, which are distinguished by an abrupt change in slope. Indicate how the absorption of the heat changes the energy (kinetic and potential) of the water molecules. 45
Page 1 and 2: Oakland Schools Chemistry Resource
Page 3 and 4: Instructional Background Informatio
Page 5 and 6: Conduction If you have ever left a
Page 7 and 8: Properties of Solids • Solids can
Page 9 and 10: Kinetic Molecular Theory Terms and
Page 11 and 12: KINETIC MOLECULAR THEORY Activity #
Page 13 and 14: Conduction http://youtube.com/watch
Page 15 and 16: Procedure: 1. Wash your hands. 2. O
Page 17 and 18: Assessment Ideas: Have students des
Page 19 and 20: Source: Chemistry: Chapter 16--Home
Page 21 and 22: KINETIC MOLECULAR THEORY Activity #
Page 23 and 24: Assessment: Have students pair and
Page 25 and 26: Pre-Lab 1. What are two major diffe
Page 27 and 28: Analysis 1. Structure analysis: a)
Page 29 and 30: Content Statements C4.3x - Solids P
Page 31 and 32: Types of Phase Changes Start from:
Page 33 and 34: Phase Changes Terms and Concepts So
Page 35 and 36: Phase Changes Activity #1--Phase ch
Page 37 and 38: Observations: 1. Describe the tempe
Page 39 and 40: Procedure: Hand warmers can be pass
Page 41 and 42: Phase Changes Activity #4--Phase Ch
Page 43: Phase Changes Activity #5-Everyday

Phase changes of water - Oakland Schools

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?