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(学普6-1)网络答疑((general 6-1) network answering)
(学普6-1)网络答疑((general 6-1) network answering) The winter vacation homework three chemical comprehensive exercises (a) (xuepu 6-1) network answer Answer: teacher Liu Xiaohua teacher According to the students response to many problems, focus on answering: The 1:C option, a chemical change involving peripheral electronic (mainly outermost electrons), before and after the reaction type and number of elements. Changes of nuclear reactions involving nuclear, type and number of elements have been changed, so it does not belong to the chemical change of nuclear reaction Question 4: the criterion of spontaneous reaction is before and after the delta H-T Delta S0. reaction gas coefficient and increase general entropy. The A reaction is endothermic and entropy reduction, Delta H-T Delta S is greater than 0., it is not spontaneous. The most typical example is made of stainless steel 6:A Question 8: red is due to Fe3+ and SCN- formed by the combination of red, fade, or Fe3+ reaction, or SCN- reaction. According to the knowledge we have learned, A KMnO4 strong oxidation, but no reduction of Fe3+, which can only be oxidized SCN-. BC we know Fe3+ can see the overall oxidation of SO2, D, is known to have increased the valence of elements. What pseudohalogen ion means and halogen ions (F-, Cl-, Br- I-), similar in nature, can launch the non oxidation of C, so wrong Question 9: according to the element conservation, reaction N atoms amol, O atoms (a+2b mol) The 10 problem: colorless exclude A. Starting without precipitation, indicating that OH- and H+ reaction; after the precipitation increased first and then decreased, the soluble part shows the Al3+ precipitation remaining shows Mg2+. C Ba (OH) 2 soluble Question 11: chemical reaction is generated, breaking the old bond bond. The old bond breaking total energy absorption (1molN2 and 3molH2): 939+3 * 436; new generation key total energy released (2molNH3, 1 NH3 with 3 N-H key): 390 x 6; so the total release of 93KJ energy Three kinds
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