Lab safety worksheet for students to identify and understand proper safety practices in a laboratory setting.

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Practicing Lab Safety (1)

Directions: Read each situation below and circle the letter of the choice that best describes the correct action to take in each case.

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1.
- A: You are doing an experiment with a Bunsen burner. Your lab partner asks you to hold a test tube for them while they heat it.
- B: You are doing an experiment with a Bunsen burner. You notice that the flame is yellow instead of blue.
- C: You are doing an experiment with a Bunsen burner. You smell something strange.

✔ Correct answer: C — If you smell something strange, you should immediately report it to your teacher because it could indicate a gas leak or chemical hazard.

> 🔍 Explanation: A yellow flame may be due to incomplete combustion but isn’t always dangerous. Holding a test tube for someone else is unsafe (you should never do this). But smelling something strange is a red flag—it could mean toxic fumes or a hazardous reaction. Always report unusual smells to your teacher.

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2.
- A: You are wearing goggles while working with chemicals.
- B: You are wearing gloves while handling a hot beaker.
- C: You are using a pipette to transfer a liquid into a test tube.

✔ Correct answer: A — Wearing goggles is essential when working with chemicals to protect your eyes.

> 🔍 Explanation: Goggles are mandatory when handling chemicals to prevent splashes or vapors from damaging your eyes. Gloves may be appropriate depending on the substance, but not all liquids require gloves. Using a pipette correctly is important, but the safest behavior here is wearing protective eyewear.

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3.
- A: You spill a small amount of acid on the lab bench.
- B: You spill a large amount of acid on the floor.
- C: You spill a small amount of acid on your skin.

✔ Correct answer: C — If acid spills on your skin, rinse immediately with water and inform your teacher.

> 🔍 Explanation: Acid on skin is a medical emergency. Immediate rinsing with water is crucial. Small spills on benches can be cleaned up safely with neutralizing agents. Large spills on floors require evacuation and teacher intervention—but skin exposure must be treated first.

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4.
- A: You see a fire extinguisher near the exit.
- B: You see a fire extinguisher on the wall.
- C: You see a fire extinguisher behind a cabinet.

✔ Correct answer: B — The fire extinguisher should be clearly visible and accessible on the wall.

> 🔍 Explanation: Fire extinguishers must be mounted on walls where they are easily seen and reachable. Placing one behind a cabinet makes it inaccessible during emergencies.

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5.
- A: You are using a graduated cylinder to measure 10 mL of water.
- B: You are using a graduated cylinder to measure 10 mL of concentrated sulfuric acid.
- C: You are using a graduated cylinder to measure 10 mL of ethanol.

✔ Correct answer: A — Measuring water in a graduated cylinder is safe and appropriate.

> 🔍 Explanation: Graduated cylinders are used for measuring liquids accurately. However, concentrated sulfuric acid is highly corrosive and reactive—it should only be measured in a fume hood with proper protection and possibly in a graduated cylinder designed for such use, but still risky. Ethanol is flammable; so caution is needed. Water is the safest option here.

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✔ Summary of Answers:

1. C
2. A
3. C
4. B
5. A

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