What is an example of chemical change

 When Sugar is cooked to make caramel, the heat from the cooking converts sugar into a different molecular structure and give the caramel its color and flavor Note that chemical changes are not reversible. 

I'm sorry i cant you if you don't list the elements : (

Heat capacity = mcδtheat capacity = 2.676×10^3 j ..the heat capacity given is for 7.00 g of kcn,potassium cyanide which is equal to 0. mole of mole = mass  ÷ mr of kcn is 7  ÷ 65 =0.therefore: 0. of kcn liberates 2.676×10^3 j of heat1 mole   (2.676×10^3    ÷  0.107 )  × 1 =do the calculation to obtain 25009 j = 25kj