Ward's World Activity Guides

Laboratory Safety Contract (continued) + ward ' s science Use Fire Safely 16. Do not use an open flame without first putting on safety goggles. 17. Know how to light and regulate a flame on a burner. 18. Never leave an open flame when flammable liquids are present. 19. Keep your area clean and free from clutter. 20. Do not reach across an open flame. 21. Always point the open end of a test tube away from others when heating liquids. Some chemicals can boil out of the test tube violently and unexpectedly when being heated. 22. Never heat chemicals in a closed container, such as a corked test tube. The expanding gas inside will cause the test tube to explode or turn the stopper into a projectile with considerable force. 23. Do not pick up a container that has been heated or hand a heated container to someone. Hold the back of your hand near the container and check for heat. If you can feel heat, use a mitten or tongs to pick up the container. 24. Know the location of all fire alarms and exits. Use Chemicals Safely 25. Never touch, taste, or smell chemicals. Many chemicals are toxic. If you are instructed to smell fumes during an investigation, do so by gently waving your hand over the container so that the fumes are brought to you. Do not bring the container to your nose. Do not inhale the fumes directly from the container, as they may be concentrated and cause you injury. 26. Use only chemicals that are listed in the investigation, and do not substitute other chemicals for the ones listed. 27. Notify the teacher immediately if chemicals have been spilled. 28. Dispose of the chemicals properly as directed by the teacher. Do not pour them into the sink or trash container. 29. Use extra precautions with acids and bases. Always pour acid into water, never pour water into acids. 30. Remember to wash any acid or base from your skin immediately and notify the teacher. 31. Use a pipette bulb. Never pipette liquids using your mouth. 32. Read the labels twice before using a chemical. Use Glassware Safely 33. Never force glass tubing into a rubber stopper. Use a lubricant and a turning motion on the glass tubing when inserting it into a rubber stopper or rubber tubing. 34. When heating glassware, use a wire or ceramic screen to protect glassware from the flame. 35. After cutting glass tubing, always fire-polish the ends to remove any sharp edges. 36. Never use broken, cracked, or chipped glassware. If glassware breaks, notify your teacher and properly dispose of it in a broken-glassware container. 37. Never eat or drink from laboratory glassware. 38. Clean glassware thoroughly before returning it to storage.

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