Answer
B (The campfire wood burns)
Work Step by Step
The burning of wood is a chemical change. Cellulose is one of the main components of wood. When cellulose is burnt, new compounds are formed. The products of burning wood in an adequate supply of air, such as in the campfire, are carbon dioxide, water vapor, and ashes (a mixture of various salts). Energy is also released in the form of heat, which makes the water boil.
Cellulose contains carbon atoms covalently bonded to hydrogen and oxygen. Its formula is (C6H10O5)n, where n represents the number of repeating units within the chain.
Word Equation
Cellulose+ Oxygen→ carbon dioxide+ water vapor
+wood ash+ Heat
Chemical equation
C6H10O5+6O2→6CO2+5H2O+Heat
