This worksheet helps students identify proper safety procedures and recognize common laboratory hazard symbols.

Worksheet: Recognizing Lab Safety Worksheet

#### Part 1: Identifying Safe and Unsafe Procedures
The task is to determine whether the proper safety procedures are being followed in each scenario. If they are, write "yes"; if not, write "no" and provide a reason.

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#### Scenario 1
Bubba cannot find matches to light his Bunsen burner. The student next to him picks up a lit burner and says, “Here, you can use my flame to light your burner.”

- Answer: No
- Reason: Using one lit burner to light another is extremely dangerous because it increases the risk of fire or explosion. Each burner should be lit individually using a dedicated lighter or match under controlled conditions.

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#### Scenario 2
Jim Bob notices that the electrical cord on his microscope is frayed near the plug. He takes the microscope to his teacher and asks for permission to use another one.

- Answer: Yes
- Reason: Jim Bob is following proper safety protocol by identifying a potential hazard (frayed cord) and reporting it to the teacher. This prevents the risk of electrical shock or fire.

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#### Scenario 3
The directions in the lab manual instruct students to pour a small amount of hydrochloric acid into a beaker. Hawkeye puts on safety goggles and a lab apron before pouring the acid into the beaker.

- Answer: Yes
- Reason: Hawkeye is taking appropriate safety precautions by wearing protective gear (safety goggles and a lab apron) when handling hazardous chemicals like hydrochloric acid. This protects against splashes or spills.

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#### Scenario 4
Trapper John finds a paper clip on the floor and becomes curious. He wants to know what will happen if he sticks the paper clip in the electrical outlet at his lab desk. His lab partners agree, and he performs his experiment.

- Answer: No
- Reason: Sticking a paper clip into an electrical outlet is extremely dangerous and could result in severe injury, such as electrocution. This is a reckless and unsafe action that violates basic laboratory safety rules.

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#### Scenario 5
While using ice in a lab, Major Burns puts a piece of ice down Captain Pierce’s shirt. To get even, Pierce grabs a handful and returns the favor.

- Answer: No
- Reason: Playing with ice or engaging in horseplay in a laboratory is unsafe and distracts from proper lab procedures. It also increases the risk of accidents, such as slips or falls, which could lead to injuries.

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#### Part 2: Identifying Safety Symbols
The task is to identify the meaning of each safety symbol provided.

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#### Symbol 6
- Meaning: Flammable materials. Indicates substances that can easily catch fire or burn.

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#### Symbol 7
- Meaning: Corrosive materials. Indicates substances that can cause chemical burns or damage to skin, eyes, or other surfaces.

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#### Symbol 8
- Meaning: Radioactive materials. Indicates substances that emit ionizing radiation, which can be harmful to living organisms.

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#### Symbol 9
- Meaning: Explosive materials. Indicates substances that can explode or detonate under certain conditions.

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#### Symbol 10
- Meaning: Toxic materials. Indicates substances that are poisonous or harmful if ingested, inhaled, or absorbed through the skin.

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#### Symbol 11
- Meaning: Biohazard materials. Indicates substances that pose a biological hazard, such as infectious agents or pathogens.

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Final Answer Summary

1. No (Using one lit burner to light another is dangerous.)
2. Yes (Reporting a frayed cord is safe.)
3. Yes (Wearing protective gear when handling acids is safe.)
4. No (Sticking a paper clip into an electrical outlet is dangerous.)
5. No (Playing with ice in a lab is unsafe.)
6. Flammable materials
7. Corrosive materials
8. Radioactive materials
9. Explosive materials
10. Toxic materials
11. Biohazard materials

Boxed Final Answer:
\boxed{
\begin{array}{ll}
1. \text{No} & 6. \text{Flammable materials} \\
2. \text{Yes} & 7. \text{Corrosive materials} \\
3. \text{Yes} & 8. \text{Radioactive materials} \\
4. \text{No} & 9. \text{Explosive materials} \\
5. \text{No} & 10. \text{Toxic materials} \\
& 11. \text{Biohazard materials} \\
\end{array}
}