Pre-experiment Basic Laboratory Techniques PDF

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PRE-EXPERIMENT: BASIC LABORATORY TECHNIQUES WORKSHEET A. Label the parts of the burner and identify its corresponding functions. (12 points total) A. Barrel B. Collar C. Air Holes D. Gas Regulator E. Gas Inlet F. Base

B. Label the parts of the triple beam balance.(5 points) 1. Pan 2. Riders 3. Pointer and Zero mark 4. Beams 5. Zero adjustment knob C. Answer the following question. (12 points total) 1. What are the basic units of length, mass, volume, temperature in the SI sytem? The metric system measures mass in grams or kilograms, distance in meters or kilometers, and volume in liters. It measures temperature in Kelvin or Celsius degrees instead of the Fahrenheit degrees used in the imperial system. 2. Why should you never weigh a hot object? Air rises when warmed by a hot sample. 3. Why is it necessary to calibrate a thermometer and a volumetric glassware? It is necessary to standardize values and ensure the instruments work properly. 4. What is precision? Precision refers to the amount of information that is conveyed by a number in terms of its digits. 5. Define density? density, mass of a unit volume of a material substance.

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D. Measurements Solve the following problems. (2 points each, 30 points total) 1. Convert 10 in3 to cm3 10x16.387064=163.87064 2. Convert 20 ft3 to cm3 20 Cubic Ft. x 28316.8467117 = 566336.934234 Cubic Centimeters 20 Cubic Ft. is equivalent to 566336.934234 Cubic Centimeters. 3. Convert 10oC to oF T(ºF) = 10ºC × 9/5 + 32 = 50ºF 4. Convert 15.3 oF to K Formula: [K] = ([°F] + 459.67) × 5⁄9 15.3 Fahrenheit = (15.3 + 459.67) × 5⁄9 = (474.97) × 5⁄9 = 263.87 Kelvin. 5. Sodium hydroxide pellet weighs 0.25grams, what is mass in milligrams 0.25g 1000 mg=250mg 1g

6. The velocity of an object is 5mi/hr. Express the velocity in km/sec? 5 mi/hr x

1 mi/s 5280 ft/s 1 m/s x x = 2.2352 m/s 3600 mi/hr 1 mi/s 3.2808 ft/s

7. The ethyl alcohol used in plant extraction measures 60cm 3. Convert its volume to liters. 60cm3 0.001L= 0.06L 1cm3 8.The mass velocity in certain plant is 5.2 kg/sec; state the mass velocity in lbs/min. 5.2kg/sec 132.277 lbs/min.= -687.8404 lbs/min. 1kg/sec. 9. The length of the jumping rope is 3 yard, what is the length in terms of mm. 3 yard 36in 2.54cm 0.01m 1000mm = 2748.2 1 yard 1in 1cm 1m 10. A man weighs 7.5 kg, what is the mass in pounds? 7.5kg x 2.20 lbs = 16.5lbs // Ikg 11. What is the density of a cube having 5.5 cm measurement on its side and its mass is 500g? V = (5.5cm) ³ = 166-375cm ³

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Density= Mass = 500g = 3.005 g/cm³ // Volume 166-375cm³ 12. What is the density of the liquid that has a volume of 55ml and weighs 110g? p = m = 110g = 2 g/ml // V 55ml

13. What is the mass of a slab iron, density 7g/cm3, dimensions are 2.50cm by 3.20 cm by 6mm? m = pv = (7 9/m³) (2.5cm • 3.2cm • 6mm • Icm. 1cm 10mm m = 33.6 grams// 14. What is the volume of a rectangular box that has a density of 2g/cm3 and has a mass of 43g? p = m; v = m v P =43g 2 g/cm³ = 21.5cm³//

15. What is the volume of 0.15kg alcohol and its density is 0.79g/m? Express your answers in L. v = m = 0.15 kg (0.79_9 x1kg x 1m3 3 P m 1000g 1000L V = 189,873.4177L //

E. Identify the lab apparatus and enumerate the uses of the following lab apparatus. Write your answers in the table below. (66 points total) 1. Burette - used in quantitative chemical analysis to measure the volume of a liquid or a gas. 2. Graduated pipet - A graduated pipette is a pipette with its volume, in increments, marked along the tube. It is used to accurately measure and transfer a volume of liquid from one container to another.[1] It is made from plastic or glass tubes and has a tapered tip. 3. Volumetric - are used for precise dilutions and preparation of standard solutions. 4. Dropper - used for measuring and transferring liquids in small amounts. 5. Beaker - are useful as a reaction container or to hold liquid or solid samples. 6. Graduated cylinder - are for measurement of an amount of liquid. The volume of liquid can be estimated to the nearest0.1 mL with practice. 7. Erlenmeyer Flasks - are useful to contain reactions or to hold liquid samples. They are also useful to catch filtrates. 8. Thermometer - measure temperature with a high level of precision for applications such as experiment monitoring, instrument calibration, materials testing, and maintaining a sterile work environment.

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9. Evaporating dish - is a tool used in labs to separate liquids and solids from a solution by allowing the water to evaporate off into the air. The result is either a more concentrated solution or the solid precipitate of the dissolved substance. 10. Watch glass - are for holding small samples or for covering beakers or evaporating dishes. 11. Test Tube - are for holding small samples or for containing small scale reactions. 12. Funnels - are for funneling liquids from one container to another or for filtering when equipped with filter paper. 13. Stirring rods - used to stir or mix solutions. 14. Distilling flasks - are used to separate mixtures of two liquids with different boiling points. 15. Liebig - is used to cool and condense a gas back to a liquid, often as part of the process of chemical distillation. 16. Test tube racks - are laboratory equipment used to hold upright multiple test tubes at the same time. 17. spatulas - are used to transfer samples or chemicals from their original containers to weighing paper, weighing boats, weighing bottles, weighing funnels, or other vessels or containers for weighing. 18. Test tube - holders are for holding test tubes when tubes should not be touched of liquid. 19. utility clamp/ thermometer clamp - Used to attach test tubes and other glassware to ring stand. 20. Crucible tong - Used to hold crucibles and evaporating dishes when they are hot. 21. ring stand - Used to hold items being heated. Clamps or rings can be used so that items may be placed above the lab table for heating by Bunsen burners or other items. 22. Double buret clamps hold two burets simultaneously. The clamps do not obscure the buret graduation lines and numbers. The clamps are intended to be attached to either 5/16" or ½" rod diameter support stands. 23. wire gauze - Used with a ring clamp to support glassware over a Bunsen burner. Spreads flame out for more even heating. 24. Tripod - is to support or hold the flasks and beakers during experiments. 25. Bunsen burner - Used for heating and exposing items to flame. 26. Triple beam balance - is a typical instrument used to measure the mass of various objects. 27. Rubber tubing - is used for the flow of fluids and gases. 28. Rubber bulb aspirator - It is suitable for moving small amounts of liquid that does not need precision measuring. 29. Safe goggles - used to protect the eye against particles, chemicals, water, glare and from things striking the eyes. 30. Safety glasses - Eye protection (safety glasses and goggles) is a personal item and should be issued for exclusive use by a particular individual. 31. Calorimeter - measures the temperature change accompanying a process.If a calorimeter experiment is carried out under constant pressure, the heat transferred provides a direct measure of the enthalpy change of the reaction. 32. Bomb Calorimeter Computer Simulation - is used to determine the enthalpy of combustion of a compound. 33. Materials Testing Machine - is a device for measuring force and displacement for various materials as they are stretched, compressed

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Reference: E. 1. https://www.britannica.com/science/burette 2.https://en.wikipedia.org/wiki/Graduated_pipette#:~:text=A%20graduated%20pipette%20is%20a, and%20has%20a%20tapered%20tip. 3.https://en.wikipedia.org/wiki/Volumetric_flask#:~:text=A%20volumetric%20flask%20(measuring %20flask,and%20preparation%20of%20standard%20solutions. 4. https://www.ehow.com/info_8003522_uses-dropper.html 5. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 6. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 7. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 8. https://www.labcompare.com/Laboratory-Analytical-Instruments/1354-LaboratoryThermometer/#:~:text=Laboratory%20thermometers%20measure%20temperature%20with,mainta ining%20a%20sterile%20work%20environment. 9. https://www.homesciencetools.com/chemistry/glassware-plasticware/evaporating-dishes-testplates/ 10. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 11. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 12. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 13. https://labsociety.com/lab-equipment/glass-stirring-rod/ 14. https://www.fishersci.com/us/en/browse/90111060/DistillingFlasks#:~:text=Distilling%20flasks%20are%20used%20to,distillation%20processes%20of%20varying% 20complexities. 15.https://americanhistory.si.edu/collections/search/object/nmah_729033#:~:text=A%20Liebig%20conde nser%20is%20used,through%20which%20the%20gas%20travels. 16. https://www.laboratory.com.ph/product/test-tube-rack-philippines/#:~:text=Description,Test%20tube%20racks%20are%20laboratory%20equipment%20used%20to%20hold%20upright,the%2 0transport%20of%20multiple%20tubes. 17. https://www.fishersci.com/us/en/browse/90227061/LaboratorySpatulas#:~:text=Commonly%2C%20spatulas%20are%20used%20to,vessels%20or%20containers%20 for%20weighing. 18. https://www2.southeastern.edu/Academics/Faculty/delbers/Common_lab_app.pdf 19. https://sites.google.com/a/d219.org/mr-kretsos/home-2/labwork/lab-equipment-and-uses 20. https://sites.google.com/a/d219.org/mr-kretsos/home-2/labwork/lab-equipment-and-uses 21. https://sites.google.com/a/d219.org/mr-kretsos/home-2/labwork/lab-equipment-and-uses 22. https://www.flinnsci.com/double-buretclamp/ap2261/#:~:text=Double%20buret%20clamps%20hold%20two,%C2%BD%22%20rod%20diamet er%20support%20stands. 23. https://sites.google.com/a/d219.org/mr-kretsos/home-2/labwork/lab-equipment-and-uses 24. http://www.canfortlab.com/Laboratory-iron-tripodp442.html#:~:text=A%20laboratory%20iron%20tripod%20is,flasks%20and%20beakers%20during%20ex periments. 25. https://sites.google.com/a/d219.org/mr-kretsos/home-2/labwork/lab-equipment-and-uses 26. https://www.webassign.net/question_assets/tamucalcphysmechl1/lab_1/manual.html 27. https://www.vedantu.com/question-answer/are-the-uses-of-glassrubber-tubes-in-the-class-11chemistry-cbse-5f836d3347e76306bacc0143

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28. https://www.nichiryo.co.jp/en/productline/pipette.html#:~:text=Same%20as%20with%20the%20K omagome,does%20not%20need%20precision%20measuring. 29. https://www.safeopedia.com/definition/73/safetygoggles#:~:text=Essentially%2C%20goggles%20are%20safety%20glasses,from%20things%20str iking%20the%20eyes. 30. https://ehs.stonybrook.edu/programs/laboratory-safety/personal-protective-equipment/eyeprotection.php 31. Module page 263 32. Module page 272 33. Module page 295

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