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3. Evaluate, with reasoning, the statement: "Fossil fuels must contain significant quantities of nitrogen because nitrogen oxides are found in the exhaust of cars and 1: Module 5: Lesson 6 3 Assignment trucks. Answer: Combustion is not always complete, usually because of an insufficient supply of oxygen. Write a hypothesis, including a chemical equation, to explain the following events a. When ethyne (acetylene) is burned in air, black soot appears. Answer: I b. Deaths have occurred when charcoal briquettes (assume pure carbon) are burned inside a tent to keep campers warm on a cold night. Answer: GA Deaths have occurred when people fall asleep in the back seat of a car that has a leaky muffler