Laboratory Safety Worksheet featuring safety questions, answer spaces, and relevant illustrations such as a balance, funnel, flask, spilled chemicals, and a hazard symbol.
Laboratory Safety Worksheet with questions, answers, and illustrations including a balance scale, funnel, flask, question mark, spilled chemicals, and a skull and crossbones symbol.
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Show Answer Key & Explanations
Step-by-step solution for: Laboratory Safety Worksheet | Free Laboratory Safety Worksheet ...
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Show Answer Key & Explanations
Step-by-step solution for: Laboratory Safety Worksheet | Free Laboratory Safety Worksheet ...
Let's go through each question on the Laboratory Safety Worksheet and provide clear, accurate answers with explanations. The worksheet includes questions about lab safety procedures, proper handling of chemicals, and recognition of safety symbols.
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Answer:
Moist or corrosive substances, powders, or chemicals that may react with the metal surface should not be placed directly on the balance pan.
Explanation:
Direct contact can damage the balance, cause inaccurate readings, or lead to contamination. Always use containers like weighing paper, glassware, or watch glasses to protect the balance.
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Answer:
Funnel and pipette (or graduated cylinder with a spout)
Explanation:
The illustration shows a funnel and a pipette. A funnel helps guide liquids into narrow openings without spillage, while a pipette allows precise transfer of small volumes.
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Answer:
Hold the stopper in your hand, not on the desk.
Explanation:
When removing a stopper from a flask (especially if it contains volatile or hazardous chemicals), always hold it in your hand so you don’t lose track of it or contaminate it. This prevents contamination and ensures you can reseal the flask safely.
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Answer:
This is likely a typo or misphrasing. There is no such thing as an "acid or base pill" in standard lab contexts. It might refer to acid/base spills or chemical pills used in emergency kits.
Correct Interpretation:
If it refers to spills, then:
→ Neutralize carefully using appropriate neutralizing agents (e.g., sodium bicarbonate for acids, vinegar for bases), wear PPE, and follow lab protocols.
Alternative (if referring to "pill" as in a chemical tablet):
→ Treat with caution—do not ingest, handle with gloves, and dispose properly.
Best Answer:
Acid or base spills should be neutralized safely using appropriate reagents, and the area should be cleaned and ventilated. Never touch or ingest them.
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Answer:
No, chewing gum is not allowed in the laboratory.
Explanation:
Chewing gum increases the risk of accidental ingestion of chemicals, contamination, or distraction. Labs require strict hygiene and safety rules—eating, drinking, and chewing gum are prohibited.
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Answer:
Wash your hands immediately under running water, then clean the spill using appropriate spill kits or neutralizers.
Explanation:
Your skin is exposed and at risk. The priority is to rinse contaminated skin thoroughly (at least 15–20 minutes) using the eyewash station or sink. Then, notify your instructor and clean the spill following protocol.
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Answer:
Do not pour unused chemicals down the drain or leave them on the bench. Return them to the designated storage area or dispose of them according to waste disposal guidelines.
Explanation:
Chemicals must be disposed of properly to prevent environmental harm, contamination, or dangerous reactions. Follow the lab’s waste management procedures.
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Answer:
Toxicity (or poison).
Explanation:
The skull and crossbones symbol is a universal warning sign for toxic substances. It indicates that the chemical can be harmful or fatal if ingested, inhaled, or absorbed through the skin.
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| Question | Answer |
|--------|--------|
| 1 | Moist, corrosive, or reactive materials; use weighing paper or containers. |
| 2 | Funnel and pipette |
| 3 | Hold the stopper in your hand, not on the bench. |
| 4 | Neutralize spills safely; never ingest. |
| 5 | No, chewing gum is not allowed. |
| 6 | Wash hands immediately, then clean the spill. |
| 7 | Dispose of unused chemicals according to lab waste procedures. |
| 8 | Toxicity / Poison |
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Let me know if you'd like this formatted as a completed worksheet!
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1. What materials should not be placed directly on the balance pan?
Answer:
Moist or corrosive substances, powders, or chemicals that may react with the metal surface should not be placed directly on the balance pan.
Explanation:
Direct contact can damage the balance, cause inaccurate readings, or lead to contamination. Always use containers like weighing paper, glassware, or watch glasses to protect the balance.
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2. What are the two tools that can assist in pouring liquid chemicals from one container to another?
Answer:
Funnel and pipette (or graduated cylinder with a spout)
Explanation:
The illustration shows a funnel and a pipette. A funnel helps guide liquids into narrow openings without spillage, while a pipette allows precise transfer of small volumes.
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3. How should you hold the stopper when removing chemicals from a flask, for example?
Answer:
Hold the stopper in your hand, not on the desk.
Explanation:
When removing a stopper from a flask (especially if it contains volatile or hazardous chemicals), always hold it in your hand so you don’t lose track of it or contaminate it. This prevents contamination and ensures you can reseal the flask safely.
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4. How should an acid or base pill be treated?
Answer:
This is likely a typo or misphrasing. There is no such thing as an "acid or base pill" in standard lab contexts. It might refer to acid/base spills or chemical pills used in emergency kits.
Correct Interpretation:
If it refers to spills, then:
→ Neutralize carefully using appropriate neutralizing agents (e.g., sodium bicarbonate for acids, vinegar for bases), wear PPE, and follow lab protocols.
Alternative (if referring to "pill" as in a chemical tablet):
→ Treat with caution—do not ingest, handle with gloves, and dispose properly.
Best Answer:
Acid or base spills should be neutralized safely using appropriate reagents, and the area should be cleaned and ventilated. Never touch or ingest them.
---
5. Can you chew gum during a lab?
Answer:
No, chewing gum is not allowed in the laboratory.
Explanation:
Chewing gum increases the risk of accidental ingestion of chemicals, contamination, or distraction. Labs require strict hygiene and safety rules—eating, drinking, and chewing gum are prohibited.
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6. What is the first thing to do if you spill a chemical on both the lab table and your hands?
Answer:
Wash your hands immediately under running water, then clean the spill using appropriate spill kits or neutralizers.
Explanation:
Your skin is exposed and at risk. The priority is to rinse contaminated skin thoroughly (at least 15–20 minutes) using the eyewash station or sink. Then, notify your instructor and clean the spill following protocol.
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7. What should you do with unused chemicals at the end of the lab?
Answer:
Do not pour unused chemicals down the drain or leave them on the bench. Return them to the designated storage area or dispose of them according to waste disposal guidelines.
Explanation:
Chemicals must be disposed of properly to prevent environmental harm, contamination, or dangerous reactions. Follow the lab’s waste management procedures.
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8. I am the head and cross-bone seen on chemical bottles or boxes. I can be found on chemical bottles or boxes. I am a symbol for ___?
Answer:
Toxicity (or poison).
Explanation:
The skull and crossbones symbol is a universal warning sign for toxic substances. It indicates that the chemical can be harmful or fatal if ingested, inhaled, or absorbed through the skin.
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✔ Final Answers Summary:
| Question | Answer |
|--------|--------|
| 1 | Moist, corrosive, or reactive materials; use weighing paper or containers. |
| 2 | Funnel and pipette |
| 3 | Hold the stopper in your hand, not on the bench. |
| 4 | Neutralize spills safely; never ingest. |
| 5 | No, chewing gum is not allowed. |
| 6 | Wash hands immediately, then clean the spill. |
| 7 | Dispose of unused chemicals according to lab waste procedures. |
| 8 | Toxicity / Poison |
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Let me know if you'd like this formatted as a completed worksheet!
Parent Tip: Review the logic above to help your child master the concept of lab safety worksheet middle school.
