🔍 Key Concepts

• Combustion products of sulfur in fuel oil • How water or water vapor in the engine or exhaust system can react with combustion gases • Long-term effects of acidic compounds on metal surfaces and engine parts

💭 Think About

• When sulfur in fuel burns, what new chemical compounds can it form with oxygen? • If those sulfur-oxygen compounds then come into contact with moisture, what can they turn into? • Which of the choices describes a result that would particularly damage metal parts in the engine, exhaust system, or boiler over time?

✅ Before You Answer

• Identify which option involves formation of an acidic substance • Eliminate options that describe issues more typical of incomplete combustion (smoke/soot) rather than sulfur-specific effects • Focus on the choice that clearly leads to corrosion of metal rather than just operational inconvenience like clogging strainers