CM8001

(a) exothermic- a charcoal briquette releases heat as it burns
(b) endothermic- water absorbs the heat necessary for evaporation from your skin, and your skin feels cooler.
(c) endothermic- ice absorbs the necessary heat to melt from the environment.

weak bond strengths for reactants, strong bond strength for products, and in doing so, the overall reaction becomes a very exothermic one. Less energy is taken in to break weak bonds, and more energy released to form strong bonds.

Heat is the energy that flows from a hotter to a colder object; consequence of motion at the molecular level. Temperature determines the direction to which heat flows (degree of hotness and coldness); average speed of that motion.

Heat from the fire cooks the food.
Temperature is the measurement of the day’s weather, and it tells us of the degree to which the temperature changes at different time intervals.

(a) It has a knocking characteristic of 98% isooctane, and 2 % hectane, which makes it 98% resistant to knocking, which is great.
(b) No, if there is a need to find out, we can’t be looking purely at octane ratings.