CM8001

a: Exothermic. Heat is released during combustion
b: Endothermic. Heat from the body allows water from the skin to change from liquid to gas and evaporate
c. Endothermic. Heat is absorbed from surrounding to melt the ice from solid to liquid

The bond energy of the products are larger than those of the reactants . This will lead to a large negative net energy indicating on an exothermic reaction. Hence, products should have a higher bond strength than reactants.

Heat is energy that that is transferred from one body to another as a result of a difference in temperature. In this case, when you touch a cup of coffee, what you feel is heat. On the other hand, temperature is a measure of hotness/ coldness expressed in terms of any scales like Celsius / Fahrenheit. Hence, if you use a thermometer to measure the hotness of the coffee, that is temperature.

a. 98% isooctane and 2% n-heptane
It has a higher octane rating than other blends sold at gasoline stations and hence is more resistant to knocking than these blends.

b. The octane rating provides no information about whether or not the fuel contains oxygenates. other labels around the pump should reveal this information.