CM8001

a. Exothermic. Burning involves combustion with oxygen, energy is released.

b. Endothermic. Water absorbs energy from the skin to break the hydrogen bonds and evaporate.

c. Endothermic. Ice absorbs energy from the surroundings to change from solid to liquid state
– Hydrogen bond breaking.

The bond energies of the products are larger than those of the reactants. This leads to a large negative net energy change indicating an exothermic reaction.

Heat is the total energy of all molecular motion inside an object. Temperature is the measure of the average heat or thermal energy of the molecules in a substance.
The human body produces heat to support life and keep you warm. The measurement of the heat produced is your body temperature.

a. Fairly resistant to engine knocking due to higher activation energy. Less likely to have uncontrolled ignition when compressed.

b. Not sure. Octane rating does not indicate if any additives were added. Will have to look deeper into the other properties of the fuel to determine if any other additives were added.