For sugar and oxygen to turn into carbon dioxide and water, carbon and oxygen bonds as well as carbon and hydrogen bonds in sugar must break. Also, the bonds between the oxygen atoms must break.
Chemical reactions involves the forming and breaking of bonds. The both processes happen at the same time and enable the rearrangement of atoms in reactants to yield products.
In the reaction; C6H12O6 + 6O2 -------> CO2 + H2O, the bonds between carbon and oxygen as well as well as the bonds between carbon and hydrogen are broken. Also, the bonds between oxygen atoms are broken and in their place, carbon bonds to two oxygen atoms to form CO2 and oxygen bonds to two hydrogen atoms to form water.
Summarily, in chemical reactions, existing bonds are broken in reactants and new bonds are formed in products.
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