Download Lab Experiment: Measuring Specific Heats of Metals using Calorimetry and more Lab Reports Chemistry in PDF only on Docsity! Ch100: Fundamentals for Chemistry page 1 of 6 Instructor: Tony Zable Experiment: Heat and Energy Objective: In this laboratory, the properties of heat and temperature will be investigated to measure the specific heats of common metals. Required: File: qkdcmk-481243-2646842-ch100-lab04heat-only-crc-s07-doc.doc Ch100: Fundamentals for Chemistry page 2 of 6 Instructor: Tony Zable o electric hot plate o specific heat specimen o 800 or 1000 mL beaker o tongs o 2 styrofoam cups & cover o digital gram balance o 2 stainless steel temperature probes o LabPro Interface o cold deionized water o CRC Handbook of Chemistry & Physics File: qkdcmk-481243-2646842-ch100-lab04heat-only-crc-s07-doc.doc Ch100: Fundamentals for Chemistry page 5 of 6 Instructor: Tony Zable Table A: Your Data Specimen: Calorimeter Specimen Both Temperature Changes Mass (g): Tinitial (oC) Tinitial (oC) Tfinal (oC) Tw (oC) Ts (oC) Analysis 1. Calculate the specific heat capacity values for your specimen using the equation on page 1 (in cal/goC) and record the values in Table B. 2. Convert the specific heat capacity values to units of J/goC. Note: The units J/goC are the same as J/g.K, since a temperature change in oC is the same as a temperature change in K units. You will only need to convert the cal units to J. Table B: Analysis s (cal/goC) s (Joules/goC) Average s Accepted s Value % Error % Range Summing Up: 1. Look up the specific heat capacity values for all of the elements in Table C (back page). Fill in the corresponding accepted value in the table above. 2. Convert the specific heat capacity values in Table C from J/goC to cal/goC. 3. Compare your value for the average specific heat to the accepted value from Table C for the corresponding substance. Conceptually, how do your values compare? 4. Determine the % error between the measured value and the accepted value for your specimen. Record % error value in Table B. 5. Determine the % range for your measured s values and record in Table B. 6. Based on your % error values, how do your measured values of specific heat capacity File: qkdcmk-481243-2646842-ch100-lab04heat-only-crc-s07-doc.doc Ch100: Fundamentals for Chemistry page 6 of 6 Instructor: Tony Zable compare to the accepted CRC values? What would be your criteria for “good” agreement between those values? 7. Is your calculation in Question 4 a measure of accuracy or precision? Explain. 8. Is your calculation in Question 5 a measure of accuracy or precision? Explain. Table C: {from Specific Heats of Elements @ 25 oC (CRC)} Specific Heat Capacity Substance s (cal/goC) s (Joules/goC) Aluminum Cadmium Copper Gold Iron Lead Silver Tin Zinc Mercury Water File: qkdcmk-481243-2646842-ch100-lab04heat-only-crc-s07-doc.doc
