The reaction that takes place in a hydrogen-oxygen fuel cell is 2H2(g)+O2(g)⟶2?

Select the major product of the reaction and determine whether the reaction is exothermic or endothermic.

H2O2 , endothermic

H2O2 , exothermic

H2O , endothermic

H2O , exothermic

Energy is released during which phase changes? check all that apply. boiling condensing depositing freezing melting subliming

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Which are examples of how technology has advanced scientific understanding.1using hot water to sterilize medical equipment.2transplanting a human organ into another individual.3inserting genes from one sheep into another cell to make a cloneunderstanding the different structures that make up a cell.4examining microorganisms from the deepest parts of the ocean