11. I would say physical because the color of the item is changed and the texture and density is changed aswell.
Answer:
the mantle because it's just built different
X moles of CO₂, and x moles of H₂O
CxH2x + 3x/2 O₂ -------> xCO₂ + xH₂O
CxH2x or CnH2n ----> ALKENE ( hydrocarbon with double bond)