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Klein Forest Chemistry Fall 2014 8/25/20141. 5 6.

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Presentation on theme: "Klein Forest Chemistry Fall 2014 8/25/20141. 5 6."— Presentation transcript:

1 Klein Forest Chemistry Fall /25/20141

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4  1. Listen to all instructions given by your teacher and follow them carefully. Read your lab assignments before beginning the experiment.  2. Perform only those experiments on which you have been instructed.  3. Report all accidents or injuries to your instructor.  4. Listen for directions or procedural alterations from your instructions as the lab progresses and follow them carefully.  5. Your behavior and attitude in lab should be excellent; both your safety and the safety of others depend upon it. There should not be any loud talking or horseplay.  6. Wear safety goggles when: ◦ A. working with heat. ◦ B. working with any type of grinding, cutting, soldering, etc. ◦ C. working with chemicals. ◦ D. instructed to do so by your teacher. 7

5  7. It is your responsibility to take care of the lab equipment, use it only as instructed, and report any damages to your teacher.  8. If you are in doubt about any procedure or how to use any equipment, ask your teacher.  9. Tie back long hair to prevent injury.  10. Wash your hands after each lab.  11. Clean and dry your lab work area at the close of the period. Return all equipment and material to the proper place. 8

6  12. Know the correct fire exit procedures for your lab area.  13. Be very careful when operating electrical equipment. ◦ A. Lab surface, equipment, or hand should not be wet. ◦ Check all cords and plugs to be sure they are in good condition. Look for exposed or broken wire and insulation in poor condition.  14. If a corrosive chemical is spilled or splashed on your skin or in your eye, flood with water immediately then notify your teacher.  15. Whenever you are asked to note the odor of any chemical, carefully waft the fumes toward your nose. Do not inhale any fumes directly. 9

7  16. When heating any solids or liquids in a test tube, keep the tube in constant motion and do not point the mouth of the test tube at anyone. Always hold the test tube at an angle and heat the sides of the test tube as well as the bottom. If the bottom alone is heated, vapor can be produced at that point which will cause the entire contents to spurt out.  17. Carefully read the label twice on any bottle prior to using the chemical. Many formulas and chemicals look very much alike but confusing them could be dangerous.  18. Never use an open flame near a flammable liquid. You should become familiar with the location and use of fire extinguishers and other emergency equipment. 10

8  19. Never taste any chemical in the laboratory. Not all poisonous materials in the laboratory are so labeled.  20. When diluting acids, always pour the acid into water while stirring. Never pour water into a concentrated acid.  21. Be cautious of any glass that has recently been heated. Hot glass looks just like cold glass but can inflict severe burns.  22. When inserting glass tubing or thermometers through stoppers, always use a cloth or towel. Grasp the tubing (or thermometer) close to the stopper which has been moistened with water or glycerin.  23. Wear an apron at all times to protect your clothing.  24. Dispose of waste chemicals as prescribed by your teacher. Do not put any solids, paper, or matches in the sink.  25. Take only the amount of materials that you actually need for an experiment. 11

9  26. Never leave flames, or materials that are being heated unattended. Extinguish all flames or hot plates before leaving the area.  27. In case of a small fire, smother them with an inflammable object. Larger fires require the use of a fire extinguisher. Major fires require evacuation of the area by the proper and orderly exit route.  28. Fire blankets should be used to extinguish fires on a person’s clothing.  29. No one is to be out their lab station except the gofer.  30. No one is to be dismissed from class on lab days until all equipment is properly returned or accounted for and all work areas are cleaned and dried.  31. Use glassware correctly. Beakers and flasks are used to contain chemicals for mixing, heating, observing, or transferring. Graduated cylinders are used to only determine the volume of chemicals described. 12

10  32. Thermometers are used to determine temperature not as stirring rods. They are not to be “shaken” down nor allowed to touch the bottom of the container while the temperature is being read.  33. During labs, all student books, purses, and backpacks are placed under the lab desk to protect them from chemical spills or damages.  34. Some volatile chemicals to recognize by name: ◦ A. acetone(l)F. ether (l) ◦ B. alcohol(l)G. carbon disulfide (l) ◦ C. gasoline (l)H. p-dichlorobenzene (s) ◦ D. benzene (l)I. naphthalene (s) ◦ E. chloroform (l) 13

11  35. The NFPA color code is to  identify hazards in chemicals. ◦ Red- Firehazard ◦ Blue- Health hazard ◦ Yellow- Instability ◦ White- Special  0 = Minimal  1=Slight  2= Moderate  3= Serious  4 =Severe 144/27/2015


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