Combustion is not always complete, usually because of an insufficient supply of oxygen. Describe a hypothesis, including a chemical equation, to...

Combustion is not always complete, usually because of an insufficient supply of oxygen. Describe a hypothesis, including a chemical equation, to explain the following events.

a.

When ethyne (acetylene) is burned in air, black soot appears.

b.

Deaths have occurred when charcoal briquettes (assume pure carbon) are burned inside a tent to keep campers warm on a cold night.