化学反应与能量变化（Chemical reactions and energy changes）.doc

化学反应与能量变化（Chemical reactions and energy changes） 1. The chemical reaction usually accompanies energy change, and the following statement is wrong () A. When coal burns, some chemical energy can be converted into heat energy B. Partial chemical energy can be converted into electrical energy at the time of electrolysis melting Al2O3 C.T. T explosion converts partial chemical energy into kinetic energy D. Magnesium strips are burned with partial chemical energy to light energy The reactions that occur in the following changes must be the REDOX reaction and the exothermic reaction is () A. saponification reaction b. aluminum heat reaction C. Neutralization reaction D. Reversible reaction 3. The following statement of reaction Zn + 2HNO3 + NH4NO3 = N2 arrow + 3H2O + Zn (NO3) 2 is correct () A.N 2 is just a reduction product. Zn (NO3) 2 is just a product of oxidation B.N H4NO3 is just an oxidant, and Zn is the reducing agent C. There are 5 moles of electron transfer in 1 mole of N2 D.H NO3 showed no acid in the reaction The following false recognition of chemical reactions is () A. It causes A change in chemical bonds. B C. The change of material state must be caused by the change of energy 5. When the Beijing standard time on September 25, 21 10 minute 04 second, Chinas space industry and usher in a historic moment, developed by our country the shenzhou vii manned spacecraft launch at the jiuquan satellite launch center, on 28th afternoon back to the beauty of the earth. The shenzhou-7 contains a large number of latest technologies, and the conventional propellant for launching the rocket is tetroxide and dimethyl hydrazine (C2H8N2). The total combustion of 5.00g C2H8N2 can release 212.5 kJ heat. The following statement is correct () A. Combustion is not necessarily oxygenated, nor is it an exothermic reaction B. After the rocket is ignited, the flame of the red flame is generated by the flame of the metal C. Rocket fuel combustion is mainly to convert chemical energy in