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  Experiment No. 1LABORATORY SAFETY AND PREVENTIVE MEASURES I. Objectives Given a lecture-discussion on the laboratory techniques and safetyprecautions, the students will be able to:1.make known the dierent laboratory techniques;2.describe what they should do if an accident occurs; and3.realize the importance of knowing the various laboratory techniquesand safety precautions in their lives. II. Pre-test Instruction: Answer by writing the letter of the BEST CHOICE in your journalnotebook.A. Multiple Choice . 1. The person eventually accountable for your safety in the laboratory is: (a) the program chair(c) the laboratory-Incharge (b) yourself (d) the laboratory assistant2. Which of the given ways for hazardous chemicals to enter the body is the most common? (a) injection (c) inhalation (b) ingestion (d) all of these3. The Chemical's Material Safety Data Sheet / MSDS is appropriately used __  (a)unnecessarily.(b)when it’s your rst-time encounter of the chemical. (c)when your instructor told you to do so.(d)when you do not recognize the chemical formula.. 4. When an emergency happens:(a) report the nature and location to your teacher.(b) vacate at once without notifying anyone.(c) telephone friends in other labS.(d) move the injured persons to safety ground.5. When disposing of chemicals, it is suitable to: (a) pour them down the drain. (b) segregate the waste according to class. (c) wait until large quantities have accumulated.(d) dispense all the trash into a general container. B.Discussion (5 points each)  1.Discuss some laboratory techniques in the laboratory.2.Discuss some precautionary measures needed in the laboratory. III. Introduction : (Read again and adhere to the general guidelines and safety precautionsin the laboratory mentioned on pages vi-iii in the preliminaries.)  The Chemistry laboratory is capable of great learning and discovery.Additional safety precautions and laboratory techniques where potential danger,accidents, and injuries exist during the conduct are specied below. Heating Substances 1) In case the Bunsen burner IS UNCONTROLLABLE, immediately turn o the gas at the gas outlet valve, then lock the needle valve and barrel of the apparatus. 2) Never allow a lit burner or hot plate unattended. Always turn o and clean them when not utilized. 3) In using the Bunsen burner, always produced a high-quality, non-luminous ame to avoid soot, unless you are not directed by theinstructor. 4) Heated metals, glassware, and porcelains do not cool them o using running water immediately. Make sure to pick them upusing tongs, test tube holders, or gloves if needed. Check if theapparatus is still hot by nearing your hand before grasping orholding it. 5)  Your Instructor will demonstrate the correct technique of heatingand boiling solutions or liquids in test tubes, observe him. Neverpoint the open end of a test tube that is heated to anybody.Bring the test tube forward and backward, never in a steadyposition to avoid popping up of the sample. Care and Use of Balances Any kind of balances you used in the lab is expensive. Therefore, youpracticed proper handling and extra care in using them. The following is a stepby step guide in using the balance (digital or analytical) more eciently andsafely.  1.Appropriately select a vessel (plastic, weigh boat, weigh paper, orglassware) to determine the weight of the substance. 2.The balance cover should be removed and then placed the clean anddry vessel on the balance pan. Check if the balance is put in an evenplain, for the analytical balance, make sure that the small minusculeliquid droplet at the back of the balance is inside the circle.3.Stabilize the reading of the balance before recording it. You can press TARE to have a ZERO weight of your container. Record the balancereading in your notebook.4.Check the values of your balance for unit consistency, and to modify ithold down the tare button/bar. 5.For analytical balance, slide one glass door of it and carefully get thedesired chemical to the vessel by using a clean, dry spatula.6.Unavoidably, If there is spillage of chemical on the balance pan, cleanthe pan immediately by using a brush or clean, and dry rags. Do not letchemicals left in the pan, it will cause rusting of it. 7.In case you get more than of the chemical that is required, transferthe excess amount to a secondary vessel.8.DO NOT RETURN excess chemical to its srcinal chemical container!Share it to the other groups or give it to the lab assistant for areservation to other lab class.9.Make sure that the balance is clean, dry, and return the balance coverafter using. 10.You follow the proper disposal of the chemicals used. Some Laboratory Safety Equipment & Protection: Fume hood Fire blanket Safety Shower    Medicine cabinet Fire Alarm Eye Wash Station Fire extinguisher   Lab gown   Goggles   Gloves   Closed-toed, at shoes CHEMICAL SAFETY SYMBOLSPoisonous  The poison symbolis self-explanatory.Whereas mostchemicals are fairlydangerous if ingested or inhaled,many of these aredangerous even oncontact. Stow away fromfoodstus Harmful material to bekept away from ediblematerial. Environmentalhazard Relatively rare withlaboratorychemicals (most of which pose someenvironmentalhazard if not got ridof correctly), theserequire  particular  care to be taken ondisposal Dangerous when wet  This generally meansthat it will react fairlyviolently with water.
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