Which description best matches the appearance of crude oil?

Which description best matches the appearance of crude oil?

• A. Gaseous substance
• B. Sticky, smelly dark brown liquid
• C. Colorless liquid
• D. White powdery solid

Answer: (B)

Crude oil is a mixture of large hydrocarbon molecules that is a liquid at room temperature but is very viscous, so it feels sticky and flows slowly. Its color is typically dark brown to black because the many components absorb light strongly, giving it a dense, opaque appearance. It also has a distinctive smell from sulfur-containing compounds and other organics. So the description that fits best is a sticky, smelly dark brown liquid. It’s not a gas, not colorless, and not a white solid powder.

Crude oil is a mixture of large hydrocarbon molecules that is a liquid at room temperature but is very viscous, so it feels sticky and flows slowly. Its color is typically dark brown to black because the many components absorb light strongly, giving it a dense, opaque appearance. It also has a distinctive smell from sulfur-containing compounds and other organics. So the description that fits best is a sticky, smelly dark brown liquid. It’s not a gas, not colorless, and not a white solid powder.