🔍 Key Concepts

• Flash point definition: the lowest temperature at which a liquid gives off enough vapor to ignite in air • General volatility and flammability of light hydrocarbons like hexane and iso-hexane • Typical temperature ranges for flash points of very volatile solvents versus heavier oils

💭 Think About

• Compare each option to what you know about how quickly iso-hexane evaporates and how easily it ignites at room temperature • Think about whether such a solvent is likely to have a flash point above, near, or well below normal room temperature • Eliminate any options that clearly belong to heavy fuel oils or non-volatile liquids rather than light hydrocarbons

✅ Before You Answer

• Be sure you understand Celsius vs Fahrenheit and convert mentally where needed (room temperature ≈ 20–25°C ≈ 68–77°F) • Ask whether iso-hexane is considered a highly volatile solvent or a relatively stable, less flammable liquid • Verify which choices represent below-freezing, around room temperature, or very hot temperatures and decide which range fits a light hydrocarbon solvent