LABORATORY SAFETY MISS HANZES CHEMISTRY & BIOLOGY BAHS Safety in the science classroom/lab is the #1 PRIORITY for students, teachers and parents. What are the lab safety rules and procedures? RULE #1 CONDUCT YOURSELF IN A RESPONSIBLE, MATURE MANNER AT ALL TIMES IN THE LABORATORY! RULE #2 Follow all written and verbal instructions carefully. If you do not understand a direction or a part of a procedure, ask the instructor before proceeding. RULE #3 Do not eat food, drink beverages, or chew gum in the laboratory. Do not use laboratory glassware as containers for food or beverages. Hazardous chemical or orange juice? RULE #4 Never fool around in the laboratory. Horseplay, practical jokes, and pranks are dangerous and prohibited. No horseplay in the laboratory, please! RULE #5 Perform only those experiments authorized by the instructor and outlined in the laboratory procedure. TRUE OR FALSE? You read over the lab procedures and safety precautions before class, so you don’t need to listen to the teacher’s verbal instructions. FALSE! TRUE OR FALSE? It is okay to drink water in the lab. FALSE! TRUE OR FALSE? You should throw away your gum before entering the lab. TRUE! GENERAL LAB SAFETY PRINCIPLES: Keep work areas clean and tidy. Only place necessary materials on the lab tables. Keep aisles clear. Push chairs in when not in use. Never work alone. Do not work in the laboratory without the instructor present. GENERAL LAB SAFETY PRINCIPLES: Know the locations and operating procedures of all safety equipment, including the first aid kit, eyewash station, safety shower, and fire extinguisher. Know where the fire alarm and exits are located. Always work in a well-ventilated area. Use the fume hood when working with volatile substances or poisonous vapors. TRUE OR FALSE? You should keep your chair pushed in during a lab activity. TRUE! TRUE OR FALSE? You don’t want to get your new bag dirty, so you can leave it on the table when performing a lab. FALSE! TRUE OR FALSE? Since you plan to always wear your safety goggles, you don’t need to know where the eyewash station is. FALSE! LABORATORY ATTIRE For your personal safety, appropriate lab attire must be worn at all times! GOGGLES: any time chemicals, heat, or glassware are used, students will wear safety goggles/glasses LONG HAIR, BAGGY CLOTHES, & DANGLING JEWELRY must be secured CONTACT LENSE wearers should not use safety glasses, only goggles APRONS should be worn when working in the lab OPEN-TOE SHOES are not permitted in the lab TRUE OR FALSE? It is not necessary to wear goggles if you are only heating water. FALSE! TRUE OR FALSE? If you wear sandals to school, you should bring extra shoes for the lab. TRUE! ENTERING THE LAB 1. Before entering the lab, read all procedures thoroughly and familiarize yourself with safely precautions. 2. Dress in appropriate laboratory attire, including goggles. 3. Enter the laboratory and sit only at your assigned work station with your assigned partner. ENTERING THE LAB 4. Locate emergency wash stations, fire extinguisher, and fire exits. 5. Do not touch any equipment, chemicals, or other laboratory materials until instructed to do so. 6. You may begin the lab when instructed, after you feel fully prepared. TRUE OR FALSE? If your lab partner is absent, you should just sit with a few of your friends. FALSE! TRUE OR FALSE? Before starting a lab, you should make sure you know were the safety shower is located. TRUE! WORKING IN THE LAB Experiments must be personally monitored at all times. DO NOT DISTRACT OTHER STUDENTS! Keep hands away from face, eyes, mouth, and body when using chemicals or preserved specimens. Be alert and proceed with caution at all times in the lab. Check all labels twice before adding/removing contents. TRUE OR FALSE? You and your partner should work together to make sure one of you is always monitoring the experiment. TRUE! TRUE OR FALSE? If you get an eyelash in your eye, you should alert the instructor, thoroughly wash your hands, and head to the restroom before attempting to get it out. TRUE! HANDLING CHEMICALS All chemicals in the lab are to be considered dangerous Do not touch, smell, or taste any chemicals unless specifically instructed to do so. Remember to waft chemical vapors in order to smell them. Never return unused chemicals to their original containers. Never remove chemicals from the laboratory. HANDLING CHEMICALS Hold chemical containers away from your body. When transporting chemical containers, hold them securely with 2 hands. Be aware of your surroundings and walk carefully. A person holding a chemical always has the rightof-way. Handle acids with extreme care. Always add acid to water. Do not dispense flammable liquids near a source of heat. TRUE OR FALSE? You are working in the lab with a solution of sucrose. You recognize this as table sugar. It is okay to have a taste. FALSE! TRUE OR FALSE? You pour out too much of a chemical into your flask. Even though it is wasteful, you should dispose of it. TRUE! TRUE OR FALSE? To save time, you can carry two beakers of chemicals, one in each hand. FALSE! HANDLING GLASSWARE & EQUIPMENT Never handle broken glass with your bare hands, use a brush and dustpan. Place broken glassware in the designated disposal container. Never use glassware that is chipped, cracked, or dirty. If you do not understand how to use a piece of equipment, ask the instructor for help. Do not immerse hot glassware in cold water; it may shatter. Hands must be completely dry before touching an electrical switch, plug, or outlet. TRUE OR FALSE? You notice a crack in one of your beakers. It still seems to hold water, so you can keep using it. FALSE! TRUE OR FALSE? You can’t figure out how to light your Bunsen burner. The instructor seems busy, so you can just ask a friend instead. FALSE! HEATING SUBSTANCES Exercise extreme caution when using a gas (Bunsen) burner. Take care that hair, clothing, and hands are a safe distance from the flame at all times. Do not put any substance into the flame unless specifically instructed to do so. Never reach over an exposed flame. Never leave a flame unattended. Light gas burners only as instructed. Turn the burner/hot plate off when not in use. HEATING SUBSTANCES Use tongs or heat-protective gloves when handling heated metals or glass. These materials take a long time to cool! Allow plenty of time for hot equipment to cool before moving it. Touch with caution. Direct the open end of heating containers away from yourself or anyone else. Never look into a container that is being heated. Hot glass looks like cold glass! TRUE OR FALSE? When using a Bunsen burner, one lab partner should always keep an eye on the flame. TRUE! TRUE OR FALSE? You cannot visually tell the difference between hot glass and cold glass. TRUE! TRUE OR FALSE? While heating a chemical in a test tube, you should look down inside to better observe the chemical reaction. FALSE! CLEANING UP THE LAB Dispose of all chemical waste properly. Chemicals should NEVER be poured down the sink drain unless the instructor says to do so. Follow the instructor’s directions for chemical and material disposal. Wash your hands with soap and water after performing all experiments. Clean all work surfaces and equipment at the end of the experiment. Return all equipment to the proper storage area. TRUE OR FALSE? You should take the time to wash your hands before leaving the lab, even if it means you will be late for you next class. TRUE! TRUE OR FALSE? You see your classmate about to pour their leftover chemicals down the sink drain. You should immediately stop them. TRUE! PREVENTING LABORATORY ACCIDENTS The simplest way to prevent accidents in the laboratory is to follow all safety rules, procedures, and guidelines outlined thus far in the presentation, and those listed on the lab instructions. PREVENTING LABORATORY ACCIDENTS Keep your workspace organized and keep aisles clear from stools, backpacks, etc. Notify the instructor immediately of any unsafe conditions you observe. You and your lab partner are working together as a team: keep an eye out for any unsafe practices that your partner may be engaging in. For example, if she forgets to wear her goggles, remind her to put them on. WHAT TO DO IF AN ACCIDENT OCCURS? Report any accident (spill, breakage, etc.) or injury (cut, burn, etc.) to the instructor immediately, no matter how trivial it may appear. WHAT TO DO IF AN ACCIDENT OCCURS? If a chemical splashes in your eyes or on your skin, immediately flush with running water from the eyewash station or safety shower for at least 20 minutes. If a fire occurs, notify the instructor immediately. If it cannot be extinguished, turn off any gas sources and exit using the fire escape route. Pull the fire alarm to notify others in the building. Avoid touching mercury from broken thermometers. TRUE OR FALSE? While using the hot plate, you get a little burn on your finger. You have survived burns much worse, so you don’t need to bother telling the teacher. FALSE! TRUE OR FALSE? You drop a test tube and it breaks into several pieces. You don’t want to get in trouble with the teacher, so you can just pick up the pieces and throw them away. FALSE! IN THE EVENT OF A FIRE DRILL… Close all containers. Turn off all gas valves, electrical equipment, and fume hood.