Chemistry Safety Worksheet

Transcription

1 Chemistry 12 Block: Laboratory Safety A. Lab Preparation Chemistry Safety Worksheet Name: Partner's name(s): Date: 1. Briefly describe where the following pieces of safety equipment are, in our laboratory, and one circumstance where you would have to use this equipment: Safety equipment Location in our classroom When (and how) it would be used Eye Wash Safety Shower Fire Extinguisher Fire Blanket Fume Hood First Aid Kit Fire Alarm 2. List 4 things you should do before starting a lab experiment. B. Handling Chemicals Safely 1. List the important pieces of information should you be looking for on the label on a chemical container. 2. What should you do with unused chemicals after an experiment? 3. What should you do with the products of an experiment? 4. If you spill a chemical, what should you do? 5. Should you add acid to water or water to acid? 6. You are asked to collect a 100 ml sample of a solution. The label on the bottle says highly corrosive. The stock bottle is a 20L bottle. How do you get your sample?

2 B. Handling Chemicals Safely continued 7. You get some chemical on your hands, and you know for a fact that it is acetic acid, which, with water, is what vinegar is made of. Would it be safe if you accidentally put your hand near your mouth? 8. A chemical that you are heating in the lab smells like vanilla. Since vanilla is an ingredient we put in cookie dough, you decide it is safe to bring it closer to your nose to get a better smell. Is this O.K.? C. Bunsen Burner Safety 1. Before hooking a Bunsen burner to the gas line, what should you look for? 2. If your Bunsen Burner flames out what should you do? 3. If you smell gas in the room, what should you do? 4. You are asked to heat an Erlenmeyer flask. The teacher provides you with a flask of sample and there is a rubber stopper on the flask. Should you proceed in heating it? Explain. 5. How do you safely heat a chemical in a test tube, with a Bunsen Burner? 6. While heating a reactant (using a Bunsen Burner, OR a hot plate), you inadvertently touch the red hot beaker with the back of your finger. What should you do? D. General Laboratory Safety 1. In the middle of a laboratory experiment, your teacher falls ill or gets injured. List the steps you should take in this situation. 2. In the middle of a laboratory experiment, a FIRE ALARM occurs. List the steps you should take in this situation. 3. In the event of an EARTHQUAKE, how would these steps change, or what extra step will be taken? E. Finishing a Lab Experiment 1. List 4 things you should do when you have finished a lab experiment.

3 A. Lab Preparation Chemistry Safety Worksheet 1. Briefly describe where the following pieces of safety equipment are, in our laboratory, and one circumstance where you would have to use this equipment: Find all safety equipment and an exit route from the classroom. Safety equipment Eye Wash Safety Shower Fire Extinguisher Fire Blanket Fume Hood First Aid Kit Fire Alarm Location in our classroom When it would be used Chemicals splashed into eyes. Flush eyes for a minimum of 15 minutes if chemicals have splashed into the eyes. Chemicals (that are deemed dangerous) have splashed onto skin. Notify teacher before using shower, as some corrosive chemicals will have stronger effects if water is used. Chemical reaction in beaker or on desktop has burst into flames. Your clothes have caught on fire. Chemicals are noxious or toxic. Known to be hazardous when inhaled. Small injury that can be treated in the classroom, before the first aid attendant is called. Only used, if instructed by teacher, in the case that a lab fire has escalated beyond the control of the classroom.

4 2. List 4 things you should do before starting a lab experiment i) Wear proper safety equipment and clothing (goggles, gloves, aprons). ii) Keep lab benches clear of books and clothes iii) Keep hair tied back and do not wear loose clothing. iv) Notify teacher ahead of time if you wear contact lenses. B. Handling Chemicals Safely 1. When you read the label on a chemical container, what important pieces of information should you be looking for? i) Is it dangerously reactive? ii) Is it corrosive? iii) Is it toxic? Also acceptable: Is it an oxidizer? Is it flammable? Is it soluble in water or in organic solvents? 2. What should you do with leftover chemicals after an experiment? Read lab instructions carefully and only do as instructed (never perform unauthorized lab experiments). Never return chemicals to a stock bottle. 3. What should you do with the products of an experiment? Dispose of chemicals and breakage as instructed. 4. If you spill a chemical, what should you do? Notify the teacher immediately if an accident, spillage, or breakage occurs. Dispose of chemicals and breakage as instructed.

5 5. Should you add acid to water or water to acid? Always add Acid to Water, this way the acid won t splash back up onto your eyes or skin. 6. You are asked to collect a 100 ml sample of a solution, that is labeled highly corrosive. The stock bottle is a 20L bottle. How do you get your sample? The teacher should have already provided a pre-poured sample of the solution in an intermediate container, for example a 500 ml beaker. This makes it easier to pour into your graduated cylinder or smaller beaker. This also prevents contamination of the stock bottle, if students incorrectly try to pour the excess solution back into the original stock bottle. 7. You get some chemical on your hands, and you know for a fact that it is acetic acid, which, with water, is what vinegar is made of. Would it be safe if you accidentally put your hand near your mouth? Never taste or touch a chemical (even if it is H2O!!!) -unless instructed to do so. Thoroughly rinse skin that has come into contact with a chemical. 8. A chemical that you are heating in the lab smells like vanilla. Since vanilla is an ingredient we put in cookie dough, you decide it is safe to bring it closer to your nose to get a better smell. Is this O.K.? Always smell chemicals in the proper manner. Waft it towards your nose and keep bottle safely away from your face.

6 C. Bunsen Burner Safety 1. Before hooking a Bunsen burner to the gas line, what should you look for? Check for: Blockages at gas tap Tears in gas tubing Check that the Bunsen burner can be choked that the throat is not jammed shut. 2. If your Bunsen Burner flames out what should you do? Immediately turn off the gas tap. Notify the teacher and she will tell you if you should try re-lighting your burner. 3. If you smell gas in the room, what should you do? Notify the teacher and she will turn off the main gas line to the classroom. 4. You are asked to heat an Erlenmeyer flask. The teacher provides you with a flask of sample and there is a rubber stopper on the flask. Should you proceed in heating it? Explain. It is unsafe to heat a corked or sealed sample, under the high heat of a Bunsen burner, as high pressure gases will need to find an escape route. Ask the teacher if it is O.K. to remove the lid, and then proceed.

7 5. How do you safely heat a chemical in a test tube, with a Bunsen Burner? Stand when heating chemicals. Never leave a bunsen burner unattended. Keep hair and loose clothing away from a bunsen flame. Always hold the test tube with tongs, at a 45 degree angle, with the mouth of the tube pointed in a direction that is not pointed at any person. The bottom of the test tube is slightly above the flame, but not pushed into the flame. 6. While heating a reactant (using a Bunsen Burner, OR a hot plate), you inadvertently touch the red hot beaker with the back of your finger. What should you do? Rinse burns with cold running water. Have your partner tell the teacher. D. General Laboratory Safety 1. In the middle of a laboratory experiment, your teacher falls ill or gets injured. List the steps you should take in this situation. Send one person to get the nearest teacher to help. Send another student to the office to get the first aid attendant. Shut off all hot plates, Bunsen burners, (and gas taps) and stop all experiments. Tell all students to sit quietly until help arrives.

8 2. In the middle of a laboratory experiment, a FIRE ALARM occurs. List the steps you should take in this situation. Shut off all hot plates, Bunsen burners, (and gas taps) and stop all experiments. The teacher will shut off the main gas supply to the classroom. If possible, do an arm sweep of all chemicals into the sink. Exit the classroom through the predetermined route. 3. In the event of an EARTHQUAKE, how would these steps change, or what extra step will be taken? Shut off all hot plates, Bunsen burners, (and gas taps) and stop all experiments. The teacher will (try to) shut off the main gas supply to the classroom. Even more important in this situation, do an arm sweep of all chemicals into the sink. Duck under desk until earthquake stops. Wait 60 seconds. Exit the classroom through the pre-determined route. E. Finishing a Lab Experiment 1. List 4 things you should do when you have finished a lab experiment i) Wash hands well after completing a lab. ii) Ensure that the bench space and sink are clear, clean, and dry after completing an experiment. iii) Ensure that the gas and water are turned off at the end of an experiment. iv) Be sure that equipment is clean and properly stored after a lab experiment.