Boeing aircraft manufacturing corporation use rivets that are made of an aluminum alloy containing 5.4% Cu, then are heated to 500 degrees Celsius and quenched in water to become soft. They are kept in boxes cooled by liquid nitrogen. Finally, they are taken and promptly used when needed. Explain why Boeing engineers follow such procedure.

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone, due to its high light availability and warm water temperature

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.

Mercury turns to a vapor at 629.88 k. how much heat is lost when 75.0 g of mercury vapor at 650 k condenses to a liquid at 297 k?