Lab 1B Results

.docx

School

University of Northwestern St. Paul *

*We aren’t endorsed by this school

Course

1006

Subject

Chemistry

Date

Jan 9, 2024

Type

docx

Pages

Uploaded by SuperHumanRabbitPerson1000

Name: Student ID: Date: 09/14/2023 Lab 1B Results The Scientific Method Record the uncertainties for which blanks are provided. Thereafter, we will assume that the uncertainties are the same for the rest of the values that are measured with that particular device. This will save a lot of tedium. Part 1: Water Plus Water Measured Values 1. Mass of empty graduated cylinder, g 41.01 2. Mass of empty pipet, g 44.12 3. Volume of water in graduated cylinder, ml 25.05 ± 0.1 4. Mass of graduated cylinder plus water, g 66.06 5. Mass of beaker plus water, g 59.30 6. Measured total volume of water in graduated cylinder, ml 49.74 7. Measured total mass of graduated cylinder plus water, g 90.75 8. Mass of beaker plus remaining water, g 34.86 9. Mass of pipet with water residue inside, g 44.19 Calculated Masses The mass of the first portion of water is the mass of the water that was first in the graduated cylinder, which is equal to Line 4 minus Line 1. Write this value on Line 10. The mass of the second portion of water is the mass of water that was delivered from the pipet, which is equal to the mass of water that was drawn into the pipet (Line 5 minus Line 8) minus the mass of the water residue that was left in the pipet (Line 9 minus Line 2). Write this value on Line 11. The predicted total mass of water is the sum of the two individual masses of water. If masses are additive, then the measured total mass of water should be equal to the predicted total mass of water. 10. Mass of first portion of water, g 25.08 11. Mass of second portion of water, g 24.37 12. The predicted total mass of water, g 49.45 (Line 10 plus Line 11) 13. The measured total mass of water, g 49.74(Line 7 minus Line 1) Calculated Volumes The volume of the first portion of water, which was measured with the graduated cylinder, was already recorded on Line 3. It is repeated here on Line 14 for convenience. The volume of the second portion of water, which was measured with the pipet, is equal to the capacity of the pipet and is recorded on Line 15. The predicted total volume of water is the sum of the two individual volumes of water. If volumes are additive, then the measured total volume of water should be equal to the predicted total volume of water. 14. Volume of first portion of water, ml 25.05 15. Volume of second portion of water, ml 24.44 ±

16. The predicted total volume of water, ml 49.49 17. The measured total volume of water (same as Line 6), ml 49.74 Questions 1. Based on your results , not on what you think you know, does the concept of additivity of mass appear valid for a mass of water mixed with another mass of water? Assume that masses are additive if the masses on Line 12 and Line 13 agree within ±0.20 g. Explain.No the masses are not within 0.20 g 2. Based on your results , not on what you think you know, does the concept of additivity of volumes appear valid for a volume of water mixed with another volume of water? Assume that volumes are additive if the masses on Line 16 and Line 17 agree within 0.5 ml. Explain. Yes the volumes are within 0.5 ml Part 2: Alcohol Plus Alcohol Measured Values 1. Mass of empty graduated cylinder, g 40.7 2. Mass of empty pipet, g 44.20 3. Volume of alcohol in graduated cylinder, ml 20.16 4. Mass of graduated cylinder plus alcohol, g 60.92 5. Mass of beaker plus alcohol, g 49.38 6. Measured total volume of liquid in graduated cylinder, ml 39.55 7. Measured total mass of graduated cylinder plus liquid, g 80.25 8. Mass of beaker plus remaining alcohol, g 29.53 9. Mass of pipet with alcohol residue inside, g 44.50 Calculated Masses The mass of the first portion of alcohol is the mass of the alcohol that was first in the graduated cylinder, which is equal to Line 4 minus Line 1. Write this value on Line 10. The mass of the second portion of alcohol is the mass of water that was delivered from the pipet, which is equal to the mass of alcohol that was drawn into the pipet (Line 5 minus Line 8) minus the mass of the alcohol residue that was left in the pipet (Line 9 minus Line 2). Write this value on Line 11. The predicted total mass of alcohol is the sum of the two individual masses of alcohol. If masses are additive, then the measured total mass of alcohol should be equal to the predicted total mass of alcohol. 10. Mass of first portion of alcohol, g 20.22 11. Mass of second portion of alcohol, g 19.55 12. The predicted total mass of alcohol, g 39.77 (Line 10 plus Line 11) 13. The measured total mass of alcohol, g 39.55(Line 7 minus Line 1) Calculated Volumes

The volume of the first portion of alcohol, which was measured with the graduated cylinder, was already recorded on Line 3. It is repeated here on Line 14 for convenience. The volume of the second portion of alcohol, which was measured with the pipet, is equal to the capacity of the pipet and is recorded on Line 15. The predicted total volume of alcohol is the sum of the two individual volumes of alcohol. If volumes are additive, then the measured total volume of alcohol should be equal to the predicted total volume of alcohol. 14. Volume of first portion of alcohol, ml 20.16 15. Volume of second portion of alcohol, ml 19.33 16. The predicted total volume of alcohol, ml 39.49 17. The measured total volume of alcohol, (same as Line 6), ml 39.55 Questions 3. Based on your results , not on what you think you know, does the concept of additivity of mass appear valid for a mass of alcohol mixed with another mass of alcohol? Assume that masses are additive if the masses on Line 12 and Line 13 agree within ±0.20 g. Explain. Yes the masses are within 0.20g 4. Based on your results , not on what you think you know, does the concept of additivity of volumes appear valid for a volume of alcohol mixed with another volume of alcohol? Assume that volumes are additive if the masses on Line 16 and Line 17 agree within 0.5 ml. Explain. yes the masses are within 0.5 ml Part 3: Alcohol Plus Water Measured Values 1. Mass of empty graduated cylinder, g 40.76 2. Mass of empty pipet, g 44.49 3. Volume of alcohol in graduated cylinder, ml 19.89 4. Mass of graduated cylinder plus alcohol, g 60.65 5. Mass of large beaker plus water, g 91.44 6. Measured total volume of liquid in graduated cylinder, ml 44.74 7. Measured total mass of graduated cylinder plus liquid, g 85.50 8. Mass of large beaker plus remaining water, g 66.84 9. Mass of pipet with water residue inside, g 44.24 Calculated Masses The mass of the alcohol is the mass of the liquid that was first in the graduated cylinder, which is equal to Line 4 minus Line 1. Write this value on Line 10. The mass of the water is the mass of water that was delivered from the pipet, which is equal to the mass of water that was drawn into the pipet (Line 5 minus Line 8) minus the mass of the water residue that was left in the pipet (Line 9 minus Line 2). Write this value on Line 11. The predicted total mass of liquid is the sum of

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version

Access to all documents
Unlimited textbook solutions
24/7 expert homework help

Recommended textbooks for you

Chemistry

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Cengage Learning

Chemistry

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Cengage Learning

Introductory Chemistry: A Foundation

Chemistry

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Cengage Learning

Chemistry & Chemical Reactivity

Chemistry

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:Cengage Learning

Chemistry & Chemical Reactivity

Chemistry

ISBN:9781133949640

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:Cengage Learning

Introductory Chemistry: An Active Learning Approa...

Chemistry

ISBN:9781305079250

Author:Mark S. Cracolice, Ed Peters

Publisher:Cengage Learning

SEE MORE TEXTBOOKS

Recommended textbooks for you

Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry
Chemistry
ISBN:9781133611097
Author:Steven S. Zumdahl
Publisher:Cengage Learning
Introductory Chemistry: A Foundation
Chemistry
ISBN:9781337399425
Author:Steven S. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Introductory Chemistry: An Active Learning Approa...
Chemistry
ISBN:9781305079250
Author:Mark S. Cracolice, Ed Peters
Publisher:Cengage Learning