🔍 Key Concepts

• Chemical Data Guide health hazard rating system and what each of the three digits represents • Difference between toxicity/poisoning by inhalation or ingestion vs. local irritation to skin and eyes • Relative severity levels often described as slight, moderate, severe

💭 Think About

• Identify which aspect of hazard (overall toxicity, vapor effects on breathing/eyes, or skin/eye contact effects) the last digit is meant to describe in this 3-digit system • Compare the wording in each choice and decide which one best matches a moderate level of a specific type of effect, not the most extreme effect • Ask yourself whether a rating of "2" is likely to indicate "slight," "moderate," or "severe" for that type of effect

✅ Before You Answer

• Verify what the third digit in the Chemical Data Guide health hazard code specifically refers to (e.g., skin/eye contact vs inhalation toxicity) • Check which options clearly describe systemic poisoning vs local irritation/burns • Eliminate any choice that sounds like a description of the most severe category (what you’d expect for a rating of 3 or higher, not 2)