This printable worksheet helps students memorize key laboratory safety rules through a fill-in-the-blank exercise.

Lab Safety Worksheet: Solution and Explanation

The worksheet focuses on completing lab safety tips using words or phrases from the provided box. Each word or phrase can only be used once. Below is the completed worksheet with explanations for each answer.

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#### Lab Safety Tips

1. Always ______ your hands before and after an experiment.
- Answer: wash
- Explanation: Washing hands helps prevent contamination and ensures cleanliness, especially when handling chemicals or biological materials.

2. Read all ______ before beginning the experiment and ask questions if you are unsure of directions.
- Answer: directions
- Explanation: Following instructions (directions) is crucial to ensure safety and proper execution of the experiment.

3. Keep your work area neat and ______.
- Answer: organized
- Explanation: An organized workspace reduces the risk of accidents and makes it easier to find equipment and materials.

4. Know the location of ______ and how to use it.
- Answer: teacher
- Explanation: Knowing where the teacher is located ensures you can seek help quickly in case of an emergency.

5. Always wear ______ when working with chemicals, burners, or any substance that may hurt your eyes.
- Answer: safety goggles
- Explanation: Safety goggles protect your eyes from splashes, fumes, and other hazards.

6. Never touch, ______, or smell any chemical.
- Answer: taste
- Explanation: Tasting chemicals is extremely dangerous and should never be done in a lab setting.

7. Be careful not to ______ any materials. If a spill does occur, clean it up immediately.
- Answer: spill
- Explanation: Spilling materials can lead to accidents, so it's important to handle them carefully.

8. Never reach across a ______.
- Answer: flame
- Explanation: Reaching across a flame can cause burns or ignite flammable materials.

9. Pull back ______ and push up sleeves.
- Answer: long hair
- Explanation: Long hair can catch fire or get tangled in equipment, so it should be pulled back.

10. Have an adult handle ______ objects such as knives or blades.
- Answer: sharp
- Explanation: Sharp objects require extra caution and should be handled by adults or under supervision.

11. Always work in a ______ and well-ventilated area.
- Answer: closed
- Explanation: A closed area ensures that fumes or hazardous substances do not spread beyond the workspace.

12. Never heat liquids in a ______ container.
- Answer: unapproved
- Explanation: Using unapproved containers can lead to explosions or other hazards.

13. Always use the tongs, clamps, or ______ when moving hot containers.
- Answer: heat-resistant gloves
- Explanation: Heat-resistant gloves protect your hands from burns when handling hot objects.

14. Never use broken or chipped ______.
- Answer: glassware
- Explanation: Broken glassware can cause cuts and is unsafe to use.

15. Dispose of ______ or other sharp objects in the proper container.
- Answer: broken glass
- Explanation: Broken glass should be disposed of safely to avoid injuries.

16. Notify the ______ immediately if you are cut, burned, or otherwise hurt.
- Answer: teacher
- Explanation: The teacher needs to be informed of any injuries for immediate action.

17. ________ your work area when the experiment is completed.
- Answer: clean up
- Explanation: Cleaning up ensures the workspace is safe and ready for the next use.

18. Return all ______ to their proper location when the experiment is completed.
- Answer: lab materials
- Explanation: Properly storing materials prevents accidents and keeps the lab organized.

19. Never perform unsupervised or ______ experiments.
- Answer: unauthorized
- Explanation: Unauthorized experiments can be dangerous and should only be conducted under supervision.

20. Wear an ______ to protect yourself and your clothes from chemicals.
- Answer: apron
- Explanation: An apron protects your clothing and skin from spills and splashes.

21. Wear closed-toe ______ when performing experiments.
- Answer: shoes
- Explanation: Closed-toe shoes protect your feet from spills, broken glass, and other hazards.

22. Make sure appliances are working properly and keep ______ untangled and out of walking paths.
- Answer: cords
- Explanation: Untangled cords prevent tripping hazards and ensure safe operation of appliances.

23. Handle ______ with care and never be cruel or harm living creatures in an experiment.
- Answer: live plants or animals
- Explanation: Live organisms require gentle handling and ethical treatment.

24. Make sure you know how to use all of the equipment and ______ if you don’t.
- Answer: ask questions
- Explanation: Asking questions ensures you understand how to use equipment safely.

25. Wear ______ to protect your hands when handling live animals, plants, or chemicals.
- Answer: plastic gloves
- Explanation: Plastic gloves provide a barrier against contaminants and protect your hands.

26. Do not ______ while completing an experiment.
- Answer: eat or drink
- Explanation: Eating or drinking in the lab can lead to accidental ingestion of harmful substances.

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Final Answer:

\boxed{
\text{wash, directions, organized, teacher, safety goggles, taste, spill, flame, long hair, sharp, closed, unapproved, heat-resistant gloves, glassware, broken glass, teacher, clean up, lab materials, unauthorized, apron, shoes, cords, live plants or animals, ask questions, plastic gloves, eat or drink}
}