Which chemical has the fastest response rate(heats up the quickest) for Hotpacks? and please include detailed reasoning.

How have the greenhouse gasses increased from the year 2000 to 2018

In a heat engine of 1000 j of heat enters the system and the piston does 500 j of work what is the final internal energy of the system if the inital energy was 2000 j we have to do all of these down here 1)write the equation 2)list out your know variables 3)plug the numbers into the equations 4)solve 5)write your solution statemtn that includes inital energuy and final energuy added

How many moles of bromine are needed to produce 3.23 moles of potassium bromide