🔍 Key Concepts

• Physical properties of toluene (boiling point, vapor pressure, flash point) as listed in typical chemical data tables or Coast Guard/MSDS references • Difference between aromatic hydrocarbons and aliphatic hydrocarbons • USCG/46 CFR and cargo-chemical reference definitions of Grade A flammable liquid and how they relate to flash point and boiling point

💭 Think About

• Think about what chemical family toluene belongs to based on its structure (relation to benzene) • Consider whether the listed boiling point and Reid Vapor Pressure values seem more like a light, highly volatile product (like gasoline) or a heavier solvent • Recall how Grade A flammable liquids are defined: are they the very light, extremely volatile products or the somewhat heavier, less volatile solvents?

✅ Before You Answer

• Check which description correctly identifies the chemical class of toluene • Verify approximate boiling point range of toluene from memory or reference material and compare it with 174°F • Confirm whether toluene’s volatility and flash point really fit the regulatory definition of a Grade A flammable liquid (very low flash point, very high vapor pressure)