Cuprous oxide (cu2o) is being reduced by hydrogen in a furnace at 1000 k. a. write the chemical reaction for the reduction of one mole of cu2o. b. how much heat is released or absorbed per mole reacted? give the quantity of heat and state whether heat is evolved (exothermic reaction) or absorbed (endothermic reaction). data: heats of formation at 1000 k in kj mol−1 : for cu2o = −175.31 kj mol−1 ; for h2o = −247.73 kj mol−1 .

Ms. sullivan's class is designing a miniature roller coaster. after first setting it up, they find that it didn't have enough speed to go through the loop de loop. instead of taking out the loop, they decide to increase the height of the first hill the coaster goes down, and this adds the speed needed to make it through the loop. what would be a drawback to this plan in real life? a) no one likes loop de loops. b) there is no downside to this plan. c) a higher hill means a scarier ride. d) a higher hill takes more time and material to build.