i) Write a full balanced equation for (a) the complete combustion of glucose and (b) the incomplete combustion of glucose. ii) Following from part i) suggest a reason (and explain) the difference with the product in reaction (a) and that of reaction (b).

Part I (4 marks) a) C₆H₁₂O₆ + 6O₂ -> 6CO₂ + 6H₂O b) C₆H₁₂O₆ + 3O₂ -> 6CO + 6H₂O Part II (2 marks) Equation (a) could be carried out in an open vessel where there is an excess of oxygen, whereas equation (b) would be carried out within a closed vessel. The reaction being carried out in a closed vessel means that the supply of oxygen is less and thus carbon monoxide is produced rather than carbon dioxide.