Anyone have a test answer for conexxus? It is the Energy in chemical reaction.
1. Which result occurs during endothermic reaction?
A. He is absorbed from the environment into the chemical(s)
B. Heat absorbed from the environment equals heat released into the environment
C. He is released from the chemical(s) into the environment
2. If,when electrolyzing water (2H2O——>2H2+O2), the total bond energy of the reactant is 2000KJ and the total bond energy of the products is 934KJ, what is The total energy of the reaction and is this an endothermic or exothermic reaction?
A. 1066KJ, exothermic
B. -1066kJ, exothermic
C. -1066KJ, endothermic
D. 1066KJ, endothermic
And so on…
First, there is absolutely nothing wrong with a girl of 12 being intested in chemistry. We need more females in chemistry, physics, engineering and other scientific fields.
second. Your answer to #1 is correct. To be transparent about #2, there is no correct answer listed. I expect the author of the problem thinks the answer is
BE reactants - BE products = energy reaction and
2000 kJ - 934 kJ = + 1066 kJ so if I were struggling to answer I would answer D. It would be endothermic also. However, that isn't correct for two reasons. First is the equation Bond energy reactants - bond energy products = delta H reaction applies ONLY for ALL gases and this problem isn't about all gases. It works so-so for gases but only so-so since bond energies for bonds listed in tables are averages. Bond energy calculations give estimates. If you desire a better answer than an estimate you should use delta Ho formation. The bond energy calculation can be improved by adding a correction factor for the delta H evaporation for H2O liquid to H2O vapor. That value is 41 kJ/mol but that 41 is not in any of the answers. Go with 1066 kJ endothermic. I have seen several problems posted on this web site recently in which reactions other than all gases are given and the problem is to be solved with bond energies. Apparently this "ALL GASES" as a requirment has slipped through the cracks.
12? Definitely shouldn’t be in chemistry
and you think...
I think 1. Is A and I’m not sure what 2. Is
I think it might be C but you might want to go with your gut
=just a 12 year old girl tryin to help