# SCH4U0 2 CHECKBRIC Lab Medical Cold Packs Calorimetry

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```					SCH4U0                                                              Name: ______________________________
Unit: Energy Changes and Rates of Reaction                                ______________________________
Lab 5.1.1. Medical Cold Pack Marking Scheme                               ______________________________

Section                                          Criteria                                      Marks
Title                     Clear and concise original title that indicates exactly what was        0   1
/1 C     studied

Purpose           /1 C    Problem/purpose is clearly stated                                       0   1

Procedure                 Steps are numbered, with each containing only one step                  0   1
(Formal)                  Included clearly identified masses, volumes, and specific equipment     0   1
 All required steps are included in the correct order                    0   1   2   3
 Past tense and third person (no personal pronouns) with no spelling     0   1
errors
/7 TI       Safety and disposal are included                                        0   1
Results                   Tables are appropriately titled and numbered on top                     0   1
(Formal)                  Tables are properly formatted with units in headings                    0   1
 Data is complete and includes the proper number of significant          0   1
digits
ANALYSIS AND CALCULATIONS
 All formulas and all calculations of molar enthalpy are included with   0   1   2
proper units; and are correct
 Percentage error calculation between your experimental value and        0   1
the accepted value for enthalpy of solution of the identified salt is
included
/7 TI
 Correct identification of salt with explanation                         0   1
Discussion                Restate purpose of lab                                                  0   1
(Formal)                  Identity of salt and percentage error are restated                      0   1
 Two experimental errors are identified                                  0   1   2
 Discussion of how each of the experimental errors affect the            0   1   2
results
 Answer to question (g), which is:                                       0   1   2
If some heat were transferred to the air or Styrofoam cups, would
your calculated enthalpy of solution of the unknown slat be too high
or too low? Explain
 Answer to question (h), which is:
0   1   2
If some salt were accidentally spilled as it was transferred from the
balance to the Styrofoam cup, would your calculated enthalpy of the
/11 TI        unknown salt be too high or too low? Explain.
 One relevant suggestion on how to improve the lab next time
0   1
Miscellaneous             Spelling and grammar                                                    0   1
 Discussion is in paragraph format                                       0   1
/3 C    Embedded citations and references are included if outside               0   1
information is used (i.e. textbook, internet, etc.)

/ 25 TI                     / 5 C                     Grand Total                        / 30

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