Lab safety and chemical hazard signs worksheet for educational use.

The task is to label each of the chemical hazard signs shown in the image. Below is the explanation and labeling for each sign:

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1st Row:

1. Sign: ☠️ (X inside a red square)
- Label: Prohibition or Do Not Enter
- Explanation: This sign indicates that something is prohibited, such as entering a restricted area.

2. Sign: ⚡ (Lightning bolt inside a yellow triangle)
- Label: Electrical Hazard
- Explanation: This sign warns of the presence of electrical hazards, such as high voltage or live wires.

3. Sign: 🔥 (Flame inside a yellow triangle)
- Label: Flammable Materials
- Explanation: This sign indicates that flammable materials are present, which can catch fire easily.

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2nd Row:

4. Sign: 🔥 (Flame with circle inside a yellow triangle)
- Label: Combustible Materials
- Explanation: This sign warns of combustible materials that can burn but require an ignition source.

5. Sign: 💣 (Explosion symbol inside a red circle)
- Label: Explosive Materials
- Explanation: This sign indicates the presence of explosive materials that can detonate under certain conditions.

6. Sign: 📏⚡ (Electric shock symbol inside a red square)
- Label: High Voltage
- Explanation: This sign warns of high-voltage electrical equipment or areas where there is a risk of electric shock.

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3rd Row:

7. Sign: ☠️ (Skull and crossbones inside a black square)
- Label: Toxic Substances
- Explanation: This sign indicates the presence of toxic substances that can cause harm or death if ingested, inhaled, or absorbed.

8. Sign: ⚠️ (Exclamation mark inside a yellow triangle)
- Label: General Warning
- Explanation: This sign is a general warning symbol used to indicate potential hazards that do not fit into other specific categories.

9. Sign: ☠️ (Skull and crossbones inside a yellow triangle)
- Label: Health Hazard
- Explanation: This sign warns of health hazards, such as exposure to harmful chemicals or biological agents.

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4th Row:

10. Sign: 💥 (Bursting symbol inside a yellow triangle)
- Label: Reactive Materials
- Explanation: This sign indicates reactive materials that can undergo violent chemical reactions under certain conditions.

11. Sign: 💥 (Bursting symbol inside a red circle)
- Label: Explosive Decomposition
- Explanation: This sign warns of materials that can decompose explosively when exposed to heat, pressure, or other conditions.

12. Sign: 🌳🔥 (Tree with flames inside a yellow triangle)
- Label: Oxidizing Agents
- Explanation: This sign indicates the presence of oxidizing agents that can enhance combustion or fire risks.

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5th Row:

13. Sign: 🔥 (Flame inside a red square)
- Label: Fire Hazard
- Explanation: This sign warns of fire hazards, indicating materials that can ignite easily or contribute to fires.

14. Sign: ⚫⚫⚫ (Three dots inside a yellow triangle)
- Label: Radioactive Materials
- Explanation: This sign indicates the presence of radioactive materials, which emit ionizing radiation.

15. Sign: 🦠 (Biohazard symbol inside a yellow triangle)
- Label: Biohazard
- Explanation: This sign warns of biological hazards, such as infectious agents or pathogens that can cause disease.

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Final Answer:

Here is the labeled table:

| Sign | Label |
|--------------------------|---------------------------------|
| ☠️ (X) | Prohibition / Do Not Enter |
| ⚡ | Electrical Hazard |
| 🔥 | Flammable Materials |
| 🔥 (with circle) | Combustible Materials |
| 💣 | Explosive Materials |
| 📏⚡ | High Voltage |
| ☠️ (Skull & Crossbones) | Toxic Substances |
| ⚠️ | General Warning |
| ☠️ (Skull & Crossbones) | Health Hazard |
| 💥 | Reactive Materials |
| 💥 (Bursting) | Explosive Decomposition |
| 🌳🔥 | Oxidizing Agents |
| 🔥 | Fire Hazard |
| ⚫⚫⚫ | Radioactive Materials |
| 🦠 | Biohazard |

Final Answer:
\boxed{
\begin{array}{|c|c|}
\hline
\text{Sign} & \text{Label} \\
\hline
☠️ (X) & \text{Prohibition / Do Not Enter} \\
\hline
⚡ & \text{Electrical Hazard} \\
\hline
🔥 & \text{Flammable Materials} \\
\hline
🔥 (\text{with circle}) & \text{Combustible Materials} \\
\hline
💣 & \text{Explosive Materials} \\
\hline
📏⚡ & \text{High Voltage} \\
\hline
☠️ (\text{Skull \& Crossbones}) & \text{Toxic Substances} \\
\hline
⚠️ & \text{General Warning} \\
\hline
☠️ (\text{Skull \& Crossbones}) & \text{Health Hazard} \\
\hline
💥 & \text{Reactive Materials} \\
\hline
💥 (\text{Bursting}) & \text{Explosive Decomposition} \\
\hline
🌳🔥 & \text{Oxidizing Agents} \\
\hline
🔥 & \text{Fire Hazard} \\
\hline
⚫⚫⚫ & \text{Radioactive Materials} \\
\hline
🦠 & \text{Biohazard} \\
\hline
\end{array}
}