4 Pages

# Density of Liquids Lab SU 2006

Course Number: CHEM 207, Summer 2006

College/University: Cornell

Word Count: 1051

Rating:

###### Document Preview

Introduction: Density can be defined by the mass of the substance over the volume which this substance occupies. This is described by the well known equation D=m/ V, where D is the density of the substance, m is the mass of the substance and V is the volume occupied by the substance. The typical units for density are g/mL. Density is an intensive property of matter. This means that it does not depend on the mass...

##### Unformatted Document Excerpt
Coursehero >> New York >> Cornell >> CHEM 207

Course Hero has millions of student submitted documents similar to the one
below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

Course Hero has millions of student submitted documents similar to the one below including study guides, practice problems, reference materials, practice exams, textbook help and tutor support.

Density Introduction: can be defined by the mass of the substance over the volume which this substance occupies. This is described by the well known equation D=m/ V, where D is the density of the substance, m is the mass of the substance and V is the volume occupied by the substance. The typical units for density are g/mL. Density is an intensive property of matter. This means that it does not depend on the mass of the substance present but rather on the nature of the substance. Each pure substance has a defined, unchanging density. As a result, density is very useful in determining the identity of an unknown liquid. The purpose of this experiment was to determine the identity of an unknown liquid based on its density using a procedure that we designed in order to maximize the precision and accuracy of our measurements of the liquids density. Experimental Procedure: Part I: Distilled Water: The procedure was first tested on samples of distilled water, which is known to have a density of about 0.997 g/ mL. 1. Distilled water was obtained in a 50mL beaker 2. A 30 mL beaker was cleaned, dried and massed on an analytical balance. The analytical balance was chosen because provided a greater degree of precision because it provided the mass to three decimal places. This mass was recorded. 3. 10.00mL0.04mL were measured in a clean calibrated pipet and placed in the 30mL beaker. The pipet was used because it provided a greater degree of precision than the graduated cylinder, which provides an uncertain measurement in the tenths place. (Before actually using the pipet for the procedure, the amount delivered by the pipet was initially tested by measuring the amount of distilled water in a graduated cylinder. The result was always very close to the 10.0 mL mark.) 4. The water and the beaker were massed in the analytical balance. This mass was recorded. 5. Steps 2-4 were repeated three times to yield three sets of data. Part II: The Unknown Liquid: 1. The glassware was cleaned and the pipet was rinsed with two washes of acetone and one of the unknown. 2. Steps 2 through 4 of the distilled water procedure were repeated but the distilled water was replaced with the unknown. Five trials were performed to yield five sets of results in order to increase the precision of our density data. Results and Discussion: Part I: Distilled Water The procedure for determining the density of 10.00mL 0.04mL distilled water was repeated three times. The data for the three trials follow. Table 1: Data and Results for the Distilled Water Procedure. Trial # 1 2 3 Mass of Beaker (g) 29.678 29.681 29.678 Mass of Beaker and Distilled Water (g) 39.617 39.672 39.619 Mass of Distilled Water Alone (g) 9.939 9.991 9.941 Density of Distilled Water (g/mL) 0.9939 0.9961 0.9941 The density of the distilled water for each trial was calculated by subtracting the mass of the empty beaker from the total mass of the beaker and the 10.00mL 0.04mL of water. This yielded the mass of the distilled water alone. This value was then divided by 10.00mL which is the average amount of water delivered by the pipet, yielding the density of the sample of distilled water. A sample calculation follows using the data from Trial 1. Sample Calculation for Density of Distilled Water: 30.617 g Beaker Distilled and Water -29.678g Empty Beaker=9.939 g Distilled Water 9.939 g Distilled Water/ 10.00mL Distilled Water = 0.9939 g/mL The average of the densities obtained in the three trials was calculated in the following manner. The average deviation for the densities obtained in the three trials was calculated in the following manner: g/mL Given the relatively small average deviation of the calculated densities for the distilled water samples (0.0938% of the average density for the distilled water), the results were determined to have an adequate degree of precision. Based on the given accepted value of .997g/mL for the density of distilled water, the percent error for our average density for distilled water was calculated in the following manner. Based on this relatively small percentage error, it was determined that our procedure produced adequately accurate results. Our conclusion on this part of the experiment was that our procedure could be safely used on the unknown in order to find its density with a great degree of precision and accuracy, meaning that our results would be reproducible as well as close to the actual accepted value. Sources of error may be contamination of the distilled water with substances that may have been present in the beaker or slight errors in pipet usage that may have allowed too little volume to be delivered into the empty beaker accounting for our slightly low average density. Part II: The Unknown Liquid: The procedure for determining the density of 10.00mL0.04mL of the unknown liquid was reproduced five times. The data for the five trials is in the following table. The mass of the unknown liquid and the density of the unknown liquid were found using the same calculation methods used in the distilled water section. Table 2: Data and Results for the Unknown Liquid Procedure Trial # Mass of Beaker (g) 32.072 29.697 32.064 29.680 29.679 Mass of Beaker and Unknown Liquid (g) 38.686 36.256 38.684 36.265 36.268 Mass of Unknown Liquid Alone (g) 6.614 6.577 6.620 6.585 6.589 Density of Unknown Liquid (g/mL) 0.6614 0.6577 0.6620 0.6585 0.6589 1 2 3 4 5 The average density of the unknown liquid was obtained in the same manner as in the distilled water section and was calculated to be 0.6597g/mL. The average deviation was calculated to be 0.0016. This relatively small average deviation (about 0.2425% of the average calculated density) led us to the conclusion that our procedure produced sufficiently precise results. The average value for the density of the unknown liquid was very close to the 0.6603 g/mL value for hexane. Using this information, the percent error was calculated to be about 0.09089%. This relatively small percent error suggests that our results were highly accurate and that it was most likely that our unknown liquid was hexane. Sources of error may be contamination of the Hexane with substances that may have been present in the beaker (acetone or distilled water for example) or slight errors in pipet usage that may have allowed too little volume to be delivered into the empty beaker accounting for our slightly low average density. Conclusion: It was determined with a high degree of precision and accuracy that the unknown liquid was hexane with an average density of 0.6597 g/ mL.

Find millions of documents on Course Hero - Study Guides, Lecture Notes, Reference Materials, Practice Exams and more. Course Hero has millions of course specific materials providing students with the best way to expand their education.

Below is a small sample set of documents:

Mercy NY - FRENCH - 115
Le plat national au Burkina Faso est le t (ou saghbo en plus), une pte faite de farine de mil, de mas et de sorgho avec une sauce. La fameuse sauce gombo, vert et visqueux, l'oseille base. Mais il est rare de trouver dans les restaurants: c'est une jungle
twsu.edu - FIN - 100
Consider the cash flows presented in the table below. What is th cash flows in year 5? Rate Year 1 2 3 4 5 15% (Same as .15) NPER Cash Flow Future Value 4 1000 \$1,749.01 3 3000 \$4,562.63 2 5000 \$6,612.50 1 7000 \$8,050.00 0 9000 \$9,000.00Total PV \$29,974.
Ashford University - EDU - 360
Developmental Assets 1Ursula KupfererKandi WojtysiakEDU 36010/25/2010Developmental Assets 2 Developmental assets are very important at any stage of a childs life, but in my opinion, the adolescence stage is one the most crucial of them all. This peri
Ashford University - PSY - 372
Classroom Management Page 1Classroom Management PSY 372 Ursula Kupferer Instructor: Kristin Hamilton September 12th 2010Classroom Management Page 2It is a known fact the every child is unique and has his/her own abilities, challenges, skills and backgr
Ashford University - HIS - 324
FCAT 1The FCAT in Florida HIS 324 Ursula Kupferer Instructor: Jennifer Hanson July 5th 2010FCAT 2A heated debate in Floridas education policy regarding standardized test for accountability purposes is the ongoing battle between students, parents, teach
Ashford University - EDU - 321
Lesson Plan Grading Rubric Content Area Points Possible Grade level and academic subject are identified. 3 The lesson plan includes features of sheltered instruction. 3Rules of grammar, usage, and punctuation are followed. Sentences are complete, clear,
Qatar University - IT - IT432
KING SAUD UNIVERSITY CCIS, IS DEPARTMENT IS466 Decision Support System Quiz Duration: 0h15mn.Exercise (5 marks) a. (0.5 pts) In classification some examples may stay without classes b. (0.5 pts) Prediction is a more general than classification c. (0.5 pt
Strayer - CIS - 305
Oracle Database 10g: Administration Workshop IStudent GuideD17090GC10 Edition 1.0 March 2004 D39126Authors Ric Van Dyke Russ Lowenthal Technical Contributors and Reviewers Donna Keesling S. Matt Taylor Jean-Francois Verrier Craig Hollister Bob Bungenst
McMaster - ECON - 1B03
ENGINEER 1C03Week 6 Midterm (version 2)Fall/Winter 20067 Term 1Question A1. Question A2. Question A3./3 /3 /3 /3 /3 /21 /21 /57Name Student NumberQuestion A4. Question A5. Question B Question C TotalInstructions1. Write and sketch all answers on t
McMaster - ECON - 1B03
Some practice multiple choice for the final exam (chapters 12-15).For the following questions, consult the diagram below: Figure 34-11. Refer to Figure 34-1. There is excess money demand at an interest rate of a. 2 percent. b. 4 percent. c. 3 percent. d
McMaster - ECON - 1B03
PRACTICE QUESTIONS, FINAL EXAM SHORT ANSWER 1. Show what happens when the central bank of a small open economy with fixed exchange rates tries to reduce the money supply. Also explain what happens in words. (5 points)rMSMD MPAD Y2. Suppose that nomi
McMaster - ECON - 1B03
PRACTICETEST1,ECON1BB3,FALL2009ECONOMICS 1BB3 Introductory Macroeconomics Sections C03, C04Term Test #1 February 7, 2009This examination paper includes 14 pages including the title page and 53 questions. You are responsible for ensuring that your copy
McMaster - ECON - 1B03
PRACTICE TEST 2b, ECON 1BB3, FALL 2009ECONOMICS 1BB3 Introductory Macroeconomics Section C02Term Test #2 March 11, 2009 This examination paper includes 13 pages including the title page and 53 questions. You are responsible for ensuring that your copy o
McMaster - ECON - 1B03
ECONOMICS 1BB3 Introductory Macroeconomics Sections C01, C02Term Test #1 October 17, 2009 This examination paper includes 14 pages including the title page and 43 questions. You are responsible for ensuring that your copy of the paper is complete. Please
McMaster - ECON - 1B03
ViewAttempt1ofunlimitedTitle: Assignment 1 DUE JAN 18 Started: January 5, 2010 11:15 PM Submitted: January 12, 2010 8:11 PM Time spent: 164:55:51 Total score: 20/20 = 100% Total score adjusted by 0.0 1. Which of the following is a positive macroeconomics
McMaster - ECON - 1B03
ViewAttempt1ofunlimitedTitle: Assignment 2 DUE JAN 25 Started: January 12, 2010 8:18 PM Submitted: January 12, 2010 8:58 PM Time spent: 00:40:05 Total score: 20/20 = 100% Total score adjusted by 0.0 1. If an increase in income results in an increase in t
McMaster - ECON - 1B03
ViewAttempt1ofunlimitedTitle: Assignment 3 DUE FEB 1 Started: January 21, 2010 10:05 PM Submitted: January 21, 2010 10:59 PM Time spent: 00:54:25 Total score: 20/20 = 100% Total score adjusted by 0.0 1. Demand is said to be elastic if Student Response 1.
Georgia Tech - ECON - 4350
4TRADE AND RESOURCES: THE HECKSCHER-OHLIN MODEL1 Heckscher-Ohlin Model 2 Effects of Trade on Factor Prices 3 Extending the Heckscher-Ohlin Model 4 ConclusionsChapter Outline Introduction Heckscher-Ohlin Model Assumptions No-Trade Equilibrium Free Tra
University of Phoenix - BUS - 210
TheScientific MethodScientific Investigation Testable Question Writing A Hypothesis Gathering Materials Writing A Procedure Conducting The Investigation Observations and Recording Data Drawing Conclusions and Sharing Results QuizThe Testable Question
Davenport - FIN - 510
125 250 375 125 250 375 500 400 100 200 300 500 0 125 250 375 125 250 375 50010%11-24a.10 15 20 25 10 20 30 40 50 0 WACC1=(1.181)3 /1(1.10)/1.10 (1.10)2 /10% /1.1812 1 / 1 3 2 .10 / 1 1 (1.181) (1.10) 10 1 Crossover Rate 1 9% IRR18.1%ALLIED COMPONEN
Rhode Island - AVS - 101
Lactose intolerant people lack the ability to produce the enzyme lactase. True A variety of muscles control movement into and out of various parts of the GI tract. True All amino acids are needed by all animals. True Adult ruminants need to have B vitamin
Auburn Montgomery - ECO - 550
4/16/2010Chapter 2. 2-15a. Using the financial statements shown below, calculate net operating working capital, total net operating capital, net operating profit after taxes, free cash flow, and return on invested capital for the most recent year. Lan &amp;
Purdue - SOC - 324
Chapter 8: Labeling or Social Reaction Theories of Crime Introduction: 1) What is the normative view of law? (also refered to as positivism) The assumption that that something is inherently bad about behaviors that are defined as crime by the criminal law
South - CHEM - 151
Abundance and Sources Nitrous oxide is produced from both natural and human-related sources Natural sources of nitrous oxide are primarily a result of bacterial breakdown of nitrogen in soils and in oceans Human sources of nitrous oxide include agricult
Mercer County Community College - PHY - 101
Physics 110 Spring 2006 Forces in 1- and 2-Dimensions Their Solutions1. Two forces F1 and F2 acts on a 5kg mass. If the magnitudes of F1 and F2 are 20N and 15N respectively what are the accelerations of each of the masses below? Fnet , y 2 2 a. Fnet = F
Mercer County Community College - PHY - 101
Whitman College Tournament 2009 Writing1 File TitleTheWritingsectionoftheSATmakesuponethirdofyourtotalcompositescore(800outof2400).Here istherundownthatIgaveintheintroductorysection:Quote:The SAT Writing section, added in 2005, is a slightly shorter 6
USC - AME - 301
194CHAPTER 4. WORK AND ENERGY4.2 Chapter 4, Problem 2Problem: A block of mass m starts from rest at the top of an incline, slides a distance s and encounters a spring of constant k . The block compresses the spring by a displacement s and then reverses
USC - AME - 301
198CHAPTER 4. WORK AND ENERGY4.4 Chapter 4, Problem 4Problem: A ball of mass m rests against the bearing plate of mass mp in a childs spring gun. The bearing plate is attached to a spring of constant k that is initially compressed through a distance .
USC - AME - 301
208CHAPTER 4. WORK AND ENERGY4.10 Chapter 4, Problem 10Problem: A block of mass m moves in a vertical slot as shown. A spring of unstretched length L and spring constant k is attached to the block. The coefficient of sliding friction between the block
USC - AME - 301
4.12. CHAPTER 4, PROBLEM 122114.12 Chapter 4, Problem 12Problem: An electric motor is pulling a block of mass, m, at constant speed, V , up an incline that is at an angle to the horizontal. The coefficient of sliding friction between the block and the
USC - AME - 301
216CHAPTER 4. WORK AND ENERGY4.15 Chapter 4, Problem 15Problem: A block of mass m is dropped from a distance H above a spring-supported surface. The mass of the surface is negligibly small and the spring constant is k. If the blocks speed, v , is half
USC - AME - 301
4.19. CHAPTER 4, PROBLEM 192234.19 Chapter 4, Problem 19Problem: A vehicle is in a circular orbit of radius rA about the moon. To transfer to an orbit of larger radius rB , the vehicle is first placed on a Hohmann transfer orbit from Point A to Point B
USC - AME - 301
5.3. CHAPTER 5, PROBLEM 32295.3 Chapter 5, Problem 3Problem: A series of n identical balls of mass m lie on a frictionless surface. Ball 1 has initial speed v1 = V and all of the other balls are initially at rest. Ball 1 collides with Ball 2, which in
USC - AME - 301
234CHAPTER 5. IMPULSE AND MOMENTUM5.6 Chapter 5, Problem 6Problem: Two balls of mass m1 = 4m and m2 = 3m and coefficient of restitution e approach each other with velocities v1 = V i and v2 = 4 V i. Determine their velocities after the impact, v1 and v
USC - AME - 301
242CHAPTER 5. IMPULSE AND MOMENTUM5.12 Chapter 5, Problem 12Problem: A large sphere of mass mL = M collides with a small sphere of mass mS = 4 M as shown. 5 Just before the impact, the large spheres velocity is vL = V j and the small spheres velocity i
USC - AME - 301
5.15. CHAPTER 5, PROBLEM 152495.15 Chapter 5, Problem 15Problem: A bullet of mass mB is fired into a wooden block of mass mA and becomes embedded in it. The block and bullet then move up the frictionless incline for a time before they come to a stop. (
USC - AME - 301
5.19. CHAPTER 5, PROBLEM 192575.19 Chapter 5, Problem 19Problem: A ball initially at rest falls from a height H above a flat surface. If the coefficient of restitution between the ball and the surface is e, to what height, h, does it rebound on the fir
USC - AME - 301
258CHAPTER 5. IMPULSE AND MOMENTUM5.20 Chapter 5, Problem 20Problem: A ball of mass m and coefficient of restitution e is dropped from a height H above a fixed incline of angle to the horizontal as shown. The height of the point of impact relative to t
USC - AME - 301
264CHAPTER 5. IMPULSE AND MOMENTUM5.22 Chapter 5, Problem 22Problem: A ball of mass m rolls into a horizontal corner with initial velocity v. After it reflects from the two walls forming the corner, it encounters a spring. The coefficient of restitutio
USC - AME - 301
268CHAPTER 5. IMPULSE AND MOMENTUM5.24 Chapter 5, Problem 24Problem: Ball B of mass 2m hangs from an inextensible cord attached to support C. Ball A of mass m strikes B with a velocity V as shown. Assuming the collision is perfectly elastic and that al
USC - AME - 301
274CHAPTER 6. SYSTEMS OF PARTICLES6.1 Chapter 6, Problem 1Problem: At a given moment in time, a system of five particles is in motion as shown. Compute the position and velocity of the center of mass. Compute the angular momentum of the system relative
USC - AME - 301
280CHAPTER 6. SYSTEMS OF PARTICLES6.4 Chapter 6, Problem 4Problem: A man of mass 4m is initially standing at one end of a canoe of mass m. Then, he moves to the opposite end of the canoe. The length of the canoe is L and it is perfectly symmetric about
USC - AME - 301
6.10. CHAPTER 6, PROBLEM 102916.10 Chapter 6, Problem 10Problem: A rocket of mass m is launched vertically and reaches a height H with speed vo when it explodes. Part A has mass 2 m and, at time after the explosion, it strikes the ground a distance H 5
USC - AME - 301
6.11. CHAPTER 6, PROBLEM 112936.11 Chapter 6, Problem 11Problem: Three identical spheres A, B and C of mass m are attached to a ring G with strings of length . Initially, the spheres all rotate about the ring with rotation rate and the ring has velocit
USC - AME - 301
298CHAPTER 6. SYSTEMS OF PARTICLES6.14 Chapter 6, Problem 14Problem: A particle of mass 2m translating at speed U approaches two vertically aligned pairs of particles connected by rods of negligible mass. The four particles connected by the rods all ha
USC - AME - 301
314CHAPTER 7. RIGID-BODY KINEMATICS7.9 Chapter 7, Problem 9Problem: Rod AB is rotating in the counterclockwise direction with constant angular velocity . Collar P slides without friction as shown with constant relative speed u. If r = 1 when = 0o and 2
USC - AME - 301
7.10. CHAPTER 7, PROBLEM 103157.10 Chapter 7, Problem 10Problem: A disk of radius R is mounted on L-shaped Rod CD and rotates with constant angular velocity as shown. Rod CD rotates with constant angular velocity about the z axis. Determine the absolut
USC - AME - 301
320CHAPTER 7. RIGID-BODY KINEMATICS7.11 Chapter 7, Problem 11Problem: A gun with Barrel OP of length is mounted on a turret as shown. The rates of change of the barrels azimuth and elevation angles, and , are d /dt = and d /dt = 1 . Determine the 3 ang
USC - AME - 301
320CHAPTER 8. RIGID-BODY KINETICS8.1 Chapter 8, Problem 1Problem: A thin disk of mass m and radius r is mounted on horizontal Axle AB as shown. The plane of the disk is inclined at an angle to the vertical. The axle rotates with constant angular veloci
USC - AME - 301
322CHAPTER 8. RIGID-BODY KINETICS8.2 Chapter 8, Problem 2Problem: A space probe of mass M is struck at Point A by a meteorite of mass m and initial velocity vo = V ( 3 i 15 j + k). Point A is located at rA = 6R i + 1 R k. The coordinate axes shown are
USC - AME - 301
8.4. CHAPTER 8, PROBLEM 43258.4 Chapter 8, Problem 4Problem: A right-circular cone of mass m, height h and base radius r spins about its axis of symmetry with angular velocity . Simultaneously, the entire cone revolves about the x axis with angular vel
USC - AME - 301
8.6. CHAPTER 8, PROBLEM 63338.6 Chapter 8, Problem 6Problem: A thin square plate of side a and mass m is hinged at Points A and B to a clevis, which rotates with constant angular velocity = j. The components of the moment of inertia tensor for the cent
USC - AME - 301
336CHAPTER 8. RIGID-BODY KINETICS8.7 Chapter 8, Problem 7Problem: Gear A of mass m and radius r is constrained to roll on fixed Gear B. It rotates with counterclockwise angular velocity about Axle AD, which has negligible mass and length L. Axle AD is
USC - AME - 301
8.8. CHAPTER 8, PROBLEM 83358.8 Chapter 8, Problem 8Problem: A projectile of mass m has a radius of gyration R about its axis of symmetry (x axis) and a radius of gyration 4R about the transverse axis (y axis). Its angular velocity, , can be resolved i
USC - AME - 301
9.2. CHAPTER 9, PROBLEM 23439.2 Chapter 9, Problem 2Problem: A weight of mass M is suspended from a horizontal surface with a three-spring arrangement as shown. The springs above the bar have constants k1 = k and k2 = 3 k. The lower spring has 2 consta
USC - AME - 301
9.5. CHAPTER 9, PROBLEM 53539.5 Chapter 9, Problem 5Problem: A block of mass m is attached to a spring with constant k from below. It is also connected to a spring with constant 5k from above by a cable and pulley as shown. At time t = 0 the block is r
USC - AME - 301
9.8. CHAPTER 9, PROBLEM 83559.8 Chapter 9, Problem 8Problem: The motion of a small cart of mass m is governed by two springs, a dashpot and an oscillating attachment, which moves horizontally with a displacement given by xA = a cos t. The length a is t
USC - AME - 301
Course OutlineAME 301Fall 2010Required Text: Vector Mechanics for Engineers - Dynamics, Beer, JohnstonSeventh, Eigth and Ninth editions of the text are are suitable for this course.Class web site: http:/www.dcwindustries.com/3011. INTRODUCTION (Week
USC - CIVIL ENG - CE 334
CE334L Fall 2010Prof. NastarHomework #1Due: 9/27/2010, 3:30 PM (Hardcopy to be submitted in class before the lecture starts)1) Problem 3.10 of CE334L class notes posted on Blackboard.2)3) Draw the Mohrs circle for problem 2 and show the graphical pr
USC - CIVIL ENG - CE 334
CE334L Fall 2010Prof. Navid NastarHomework #2Due: No need to submit (Practice Problems)Problems 3.4, 3.6, 3.7, and 3.13 of CE334L class notes posted on Blackboard.
USC - CIVIL ENG - CE 334
CE334L Fall 2010Prof. NastarHomework #3Due: 10/18/10, 3:30 PM (Hardcopy to be submitted in class before the lecture starts)Provide concrete mix design given the following conditions:Target concrete strength = 3000psi in 28days Type of Construction: R