Laboratory Techniques and Measurements

Name Kensley ShelleyDate 9-17-12 Exp 2 Laboratory Techniques & metersLab Section 0000 information instrument panels measuring stick 1 Length and touchstones target MeasuredLength in cmLength in mm key5. 15 cm51. 5 mm CD12. 0 cm120. 0 mm Fork Spoon18. 05 cm 16. 30 cm180. 5 mm 163. 0 mm Step 2 Warm Temperature Measurements Hot tap weewee temperature49. 50_? C Boiling piddle temperature __immediately104. 5 after 5 bitutes 103. 0__? C Step 3 refrigerant Temperature Measurements Cold tap pissing system temperature_24. 5_? C wish-wash water temperature after 1 min4. 5, after 5 min1. 0 ? C Step 4 loudness Measurements intensity take of half filled calibrated piston chamber__12. 5__mL flashiness of completely filled small foot race tube __n/a__mL Number of drops in 1 mL___14_drops hoi polloi of the micro pipet __28__ drops_2___mL Step 6 absorption Measurements Part A galvanic pile of empty receive cylinder_16. 9_g nap of graduated cylinder and water 21. 1_g last-plac e potbelly of the water __4. 2_g Density of the water_0. 84_ g/mL Part B the great unwashed of graduated cylinder and alcohol _20. 4_g dinero pile of the alcohol __3. 5_g Density of the alcohol__0. 7__ g/mL Part C destiny of graduated cylinder and flavor upshot ____g Net potentiometer of the salt solution____gDensity of the salt solution____ g/mL Part D Volume of half filled graduated cylinder__8. 0__mL Volume of half filled graduated cylinder and metallic element bolt_9. 1__mL Volume of the metal bolt_1. 1_mL multitude of the metal bolt __7. 2__g Density of the metal bolt__6. 55__g/mL Part E portion of half filled beaker__89. 0__g aggregate of water displaced by metal bolt__90. 1__g Volume of the metal bolt__1. 1__cc Density of the metal bolt__6. 55__g/cc band of half filled beaker__89. 0__g Mass of water displaced by drawing card__89. 8__g Volume of the magnet _0. _cc Mass of the magnet __4. 0_g Mass when displace the magnet in the beaker__92. 9__g Density of the ma gnet__5. 00__g/cc Calculated ledger of the magnet exploitation dimensions of length x width x height__0. 78__cc Density of magnet using the reckon strength_5. 13___g/cc Conclusion Questions and Problems A. Which method of ascertain density is to a greater extent correct, the water version method in Part D or Archimedes dominion method in Part E? wherefore? For the metal bolt, I received the same arrange for both experiments, so I would swan both were equalizely finished in my experiment.B. What is the relationship in the midst of mL and cm3? They equal each other mL = cc C. Every i slams that water is supposed to boil at 100 C. Why did your water audition boil at a variant temperature? Water boils at different temperatures depending on the altitude. The higher pressure in the vent keeps the molecules from escaping as good. D. To facilitate you get a feel for metric metres, you need to know the relative magnitude of a some basic measurements. For example 1 mm = thickness of a dime, a cent weighs 2 ? grams, and 20C = teaching room temperature. Determine the following . What is the piling in kilograms (kg) of a person who weighs 143 lb? 64. 86 kg 2. What weighs approximately 1 g? dollar bill, makeup cultivate 3. What is approximately 1 cm long, considerable or thick? fingernail is 1 cm wide 4. What weighs about 100 g? 20 nickels, 40 pennies 5. What weighs about green g? 1 liter of water Conclusion The experiment was designed to assistant acquaint the student with proper science laboratory measurements and techniques. This was done by allowing the student to put on the different lab tools in a variety of ways, such as heating, measurements, flock, and density.In terminate this lab, I am better informed of the different tools which will be utilize and how to justly go for them, because a comminuted mistake in measuring lowlife skew your entropy. I witnessed this in the density calculations in that the wrong mass or passe l could greatly skew the results of the density. I first dispositioned 7. 6 g as the mass for the metal bolt, however on second glance I realized it was only 7. 2 g. speckle this may non seem hearty at first, having a difference of 0. 4 g is very signifi whoremastert in determining the correct density. I in either case observed how important it is to account for one unsure public figure.When measuring items using the cm side of the ruler, I had to account for an uncertain digit when it measured in between dickens lines. Accounting for this uncertain digit helps to gain a more accurate reading. Also, reading at the bottom of the semilunar cartilage is also very important when measuring. When I first used the beaker, I did not get down to eye level and therefore I could not properly see the meniscus, but after pose it to eye level, I could see that I was slightly off on my measurement. I also learned how to determine the mass of certain quarrys that argon not easily meas ured.I did so by first measuring the cylinders mass and then measuring the mass of the cylinder with the liquid in it. I was then able to subtract the two and get a good measurement of the mass of the liquid. Another technique effective was using displaced water to determine the volume and subsequently the density of an heading. By putting the object on a pull out and placing it in the water, I was able to record the mass of the displaced water (90. 1 g), which i was then able to convert to the volume of the object (1. 1 mL). This number on with the mass of the object (7. g), could then be converted to the density of the object (6. 55 g/cc). There were a a few(prenominal) potential errors that could call for occurred while preforming the experiments. First, when calibrating my at home scale, I had to place an object that was 500 g on the scale. enchantment I believe the object I placed on it was close to that mass, it could have been off slightly which could have skew my resu lts. Also, there is always the possibility of miscalculations when I was determining the volume of the magnet using the ruler. There is always the chance of dud counting something which can led to outside results.Laboratory Techniques and MeasurementsMeasurementLength, Mass, Volume, Density, and term hammer Jeschofnig, Ph. D. Version 42-0267-00-01 Lab RepoRt suspensor This document is not meant to be a substitute for a formal laboratory report. The Lab Report Assistant is merely a summary of the experiments questions, diagrams if needed, and data tables that should be addressed in a formal lab report. The function is to facilitate students writing of lab reports by providing this information in an editable file which can be sent to an instructor. data parry 1 Estimation of various measurements Measurement Estimated Actual % Error Length (m) clock (s) Mass (g) Data Table 2 Measurement of an object using various instruments Length(cm) Width(cm) Height(cm) Volume(cm 3) target organism Measured ease up (hand units) pass along (cm) pattern Meter mag tape Data Table 3 Measurement of an object using various instruments Length(cm) Width(cm) Height(cm) Volume(cm3) Object Being Measured Hand (hand units) Hand (cm) Ruler Meter tape Data Table 4 Measurement of an object using various instruments Length(cm) Width(cm) Height(cm) Volume(cm3) Object Being Measured Hand (hand units) Hand (cm) Ruler Meter tape Data Table 5 Determination of ? Object diameterD(cm) CircumferenceC(cm) list % Error Data Table 6 Density measurements Method Volume of water in graduated cylinder (mL) Volume of water+ bolt(mL) Volume of bolt (mL) Mass of bolt in air (g) Mass of bolt in water (g) Mass of bolt lost in water (g) Density orS. G. ofbolt(g/mL)S. G. =unitless Water- displacement method Archimedes principle method Data Table 7 Time measurements using visual cues inclina tion duration (s) attempt 1 Trial 2 Trial 3 median(a) Data Table 8 Time measurements using auditory cues Drop time (s) Trial 1 Trial 2 Trial 3 Average Questions movement 1 Estimation of Various Measurements A. Why is it important to correctly estimate length, time, and mass? Exercise 2 Measuring development Instruments of Varying Degrees of Precision A. Can you phone of an occasion when it would be adequate to use your hand measurement? B. What would happen to your volume calculations if the length, width and height measurements were off a little? Exercise 3 Graphing data and the determination of ?Object Description Diameter (cm) Circumference (cm) Measuring Device cent 1. 90 0. 01 5. 93 0. 03 Vernier caliper, penning D cell battery 3. 30 0. 02 10. 45 0. 05 Vernier caliper, paper polyvinyl chloride cylinder A 4. 23 0. 02 13. 30 0. 03 Vernier caliper, paper PVC cylinder B 6. 04 0. 02 18. 45 0. 05 plastic ruler, paper Tomato soup can 6. 6 0. 1 21. 2 0. 1 Pl astic ruler, paper 5. Graph C vs. d using a computer spreadsheet program. 7. What is the dispose of the line? What does it represent? 8. Calculate the percentage error of your set from the true value of pi.Exercise 4 Density Measurements A. Which of the two volume determinations will be more accurate? Why? B. Research the Archimedes principle method. relieve one paragraph explaining why it is called Archimedes principle Exercise 5 Time Measurements A. Which is more accurate, the individual times or the middling? Explain. B. Sometimes many trials are ply and recorded. Then the highest and lowest data points are disregarded when taking the average. Could this technique help in this experiment? How? C. Explain any differences that occurred between recording the data visually and aurally.