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Chem Post Lab Questions 3. Given that accuracy is how close values are to an accepted value and precision refers to reproducibility, comment on the accuracy and precision of your experiment. Predict causes the errors with in the experiment? (Do NOT state human error.)

Chem Post Lab Questions 3. Given that accuracy is how close values are to an accepted value and precision refers to reproducibility, comment on the accuracy and precision of your experiment. Predict causes the errors with in the experiment? (Do NOT state human error.)

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Chem 105-Online DATA TABLE Mass of test tube Mass of test tube & metal Mass of metal Mass of calorimeter Mass of calorimeter & water Mass of water Temp of boiling water (metal) Temperature of water in foam cup Highest temp (after metal added) Change in water temperature (ATW) Change in metal temperature (ATM) Trial 1 19.34g 38.14g 18.89 3.819 51.749 247.9x4-184[37°C 47.99 206°F 98°C 72.5°F 23° 80 of 26°C 3°C -72°C Trial 2 19.20g 37.95g 18.75g 4.26g 49.309 45.04g १८०० 72.5° 23°C 27% Trial 2:9-MCS A Tw Post-lab Calculations: 1. Calculate the specific heat, for both trials, by setting heat gained by the water (qw) = to heat lost by the metal (am). Trial 1: qw-mwCS ATW, 4°C ۹۰۰ ما - - 2.45.04x4.184 x 4°c=753.79J 9w:-9m=753.79J 9M-Mm Cs ATm c=601.245 9w=-9m=601.24⁰ am=ms (s(-12) (5=0.4445/9°C -753.79 J-16.75g Cs (-69) ( Cg=0.5833/9°C Average specific heat of the trials: 2. Calculate your percent error with the accepted value for the specific heat being of 0.5024J/gºC. Qwader = Mwater x Swater x (Tf-T:) 47.9x 4.184 x (26-23) Cmetal Metal xSmetalx (Ti-Tf) = 18.8 x 5metal x (98-26) @metal: Qwater Quater: 45.04x4.184 x(27-23) &meta=18.78x Smetal x(96-27) @metal-Qwater %error: (as134-0.5024 0.5024 18.75 x5 metal (96-27):45.04x4.184x(27-23) 18.75x5metal x69=45.04x4.184x4 Smetal x129375-753.79 18.8x5metal x (98-26)=47.9x4-184x (26-23) Smetal = 753.79 1/9-c 18.8 x ³metal x 72=479x4.184x3 Smetal x 1353-6=601.2408 metal=0.5835/gfc 1293.75 Smetal = 6012.4083/g.c Smetal 20.442 5/9- -°C % error -0.011 Saug 20.4442 +0.58263/g-0.51343/9-c 0.5ozy 100 0.5024 = 2.19% Posl 3.
Transcribed Image Text:Chem 105-Online DATA TABLE Mass of test tube Mass of test tube & metal Mass of metal Mass of calorimeter Mass of calorimeter & water Mass of water Temp of boiling water (metal) Temperature of water in foam cup Highest temp (after metal added) Change in water temperature (ATW) Change in metal temperature (ATM) Trial 1 19.34g 38.14g 18.89 3.819 51.749 247.9x4-184[37°C 47.99 206°F 98°C 72.5°F 23° 80 of 26°C 3°C -72°C Trial 2 19.20g 37.95g 18.75g 4.26g 49.309 45.04g १८०० 72.5° 23°C 27% Trial 2:9-MCS A Tw Post-lab Calculations: 1. Calculate the specific heat, for both trials, by setting heat gained by the water (qw) = to heat lost by the metal (am). Trial 1: qw-mwCS ATW, 4°C ۹۰۰ ما - - 2.45.04x4.184 x 4°c=753.79J 9w:-9m=753.79J 9M-Mm Cs ATm c=601.245 9w=-9m=601.24⁰ am=ms (s(-12) (5=0.4445/9°C -753.79 J-16.75g Cs (-69) ( Cg=0.5833/9°C Average specific heat of the trials: 2. Calculate your percent error with the accepted value for the specific heat being of 0.5024J/gºC. Qwader = Mwater x Swater x (Tf-T:) 47.9x 4.184 x (26-23) Cmetal Metal xSmetalx (Ti-Tf) = 18.8 x 5metal x (98-26) @metal: Qwater Quater: 45.04x4.184 x(27-23) &meta=18.78x Smetal x(96-27) @metal-Qwater %error: (as134-0.5024 0.5024 18.75 x5 metal (96-27):45.04x4.184x(27-23) 18.75x5metal x69=45.04x4.184x4 Smetal x129375-753.79 18.8x5metal x (98-26)=47.9x4-184x (26-23) Smetal = 753.79 1/9-c 18.8 x ³metal x 72=479x4.184x3 Smetal x 1353-6=601.2408 metal=0.5835/gfc 1293.75 Smetal = 6012.4083/g.c Smetal 20.442 5/9- -°C % error -0.011 Saug 20.4442 +0.58263/g-0.51343/9-c 0.5ozy 100 0.5024 = 2.19% Posl 3.
Chem Post Lab Questions Given that accuracy is how close values are to an accepted value and precision refers to reproducibility, comment on the accuracy and precision of your experiment. Predict causes the errors with in the experiment? (Do NOT state human error.) C 3. 4. Suppose you took the test tube out of the boiling water bath for ~30 seconds as you forgot to take the initial temperature of the water in the calorimeter. How would your specific heat calculation be affected for your metal? How do you know? (Be specific, do not simply state the value would be "different", "off" or "incorrect".) 5. Suppose a student took the test tube of metal and placed it directly into the cup of water instead of actually pouring the metal in the cup. How would this impact the results of the experiment? (Be specific, do not simply state the value would be "different", "off" or "incorrect". Hint, think of what else is being added to the calorimeter).
Transcribed Image Text:Chem Post Lab Questions Given that accuracy is how close values are to an accepted value and precision refers to reproducibility, comment on the accuracy and precision of your experiment. Predict causes the errors with in the experiment? (Do NOT state human error.) C 3. 4. Suppose you took the test tube out of the boiling water bath for ~30 seconds as you forgot to take the initial temperature of the water in the calorimeter. How would your specific heat calculation be affected for your metal? How do you know? (Be specific, do not simply state the value would be "different", "off" or "incorrect".) 5. Suppose a student took the test tube of metal and placed it directly into the cup of water instead of actually pouring the metal in the cup. How would this impact the results of the experiment? (Be specific, do not simply state the value would be "different", "off" or "incorrect". Hint, think of what else is being added to the calorimeter).
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