Wood changes chemically to carbon dioxide when it burns and leaves a residue of ashes. These ashes cannot be changed back to wood. When air and water act on an object made of iron, a new substance, rust, is formed. Rust is a different substance than iron.
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Answer:
Wood changes chemically to carbon dioxide when it burns and leaves a residue of ashes. These ashes cannot be changed back to wood. When air and water act on an object made of iron, a new substance, rust, is formed. Rust is a different substance than iron.