🔍 Key Concepts

• Oxidation reactions between cargo and air • Meaning of unstable oxygen compounds (tend to decompose suddenly) • Typical dangerous outcomes of cargo reacting with air in enclosed spaces

💭 Think About

• Which option describes a sudden, violent release of energy that might happen if an unstable oxygen compound breaks down? • Which options (B, C, D) are more like ordinary chemical changes or by‑products, not necessarily tied to instability? • Think about what hazard safety data sheets warn about when materials are labeled as "oxidizers" or "spontaneously combustible".

✅ Before You Answer

• Identify which choice represents a violent hazard rather than a routine by‑product or gradual reaction • Ask: does forming CO2 or water usually describe something unstable and dangerous, or normal combustion products? • Consider whether polymerization is primarily about linking molecules together or about sudden decomposition of unstable oxygen compounds.