Octane is one of the commonest compounds found in petrol (gasoline). When it burns in a car engine this reaction takes place: C8H18(l) + 12.5O2(g) > 8CO2(g) + 9H2O(l) ∆H = –5400kJ mol–1 (a) Do the products contain more or less chemical energy than the reactants?

12. complete each of the following word equations for synthesis reactions. a. sodium + oxygen -> b. magnesium + fluorine -> 13. complete and balance the equations for the decomposition reactions. a. hgo -> [with the triangle heat symbol above the arrow] b. h2o(l) -> [with "electricity" written above the arrow]

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

Take a look at this dandelion. the yellow flower on the right is pollinated and the seeds on the left are transported by