🔍 Key Concepts

• Hazard classes and labels used for flammable metals like magnesium under U.S. hazardous materials rules (49 CFR) • Difference between an oxidizer, a corrosive, and a flammable solid • How official labels are named (e.g., "flammable solid," "oxidizer," etc.), not by color alone

💭 Think About

• Ask yourself what actually happens when magnesium scrap burns or reacts with water or air—does it behave like an oxidizer, a corrosive, or something else? • Look at each choice and decide: is this the formal hazard label name used for magnesium scrap, or does magnesium belong in a different hazard class? • Consider whether any regulatory label would be named only by a color, or if official labels always describe the type of hazard.

✅ Before You Answer

• Verify which hazard class magnesium or magnesium scrap is normally assigned to (for example, flammable solid vs oxidizer vs corrosive). • Check if "yellow" is ever used as an official hazard label name, or if colors are just background colors behind a different worded label. • Confirm whether magnesium scrap is known to supply oxygen (oxidizer) or chemically eat away skin/metals (corrosive), or if it mainly acts as a combustible metal.