CM8001

A) Exothermic, energy is released in the burning process.
B) Endothermic, heat has to be absorbed in order for the water to evaporate (overcoming hydrogen bond) . The body cools as a results
C) Endothermic, heat has to be absorbed to overcome the intermolecular forces, the hydrogen bonding between water molecules.

For a good explosion, the relative bond strengths of products should be way stronger, so that more heat will be released upon formation. For a better explosion, gaseous reactants are more effective.

Heat of an object refers to the kinetic energy in the object. Temperature is a form of heat measurement. Heating of water can be a an example. As water heats up, the molecules gain more heat energy and move faster, this will be reflected with a rise in temperature.

A) it means a knocking characteristic of 98% isooctane and 2% of heptane. The octane rating is a measure of the ability of the gasoline to burn smoothly without knocking.
B) The rating does not indicate if the fuel contains oxygenates. Information on oxygenates can be found on the other labels.