化学五年高考真题精练（Five years of chemistry college entrance exam is refined）.doc

化学五年高考真题精练（Five years of chemistry college entrance exam is refined） In 2009, the second round of hot topic training of the college entrance examination was 35 - comprehensive calculation (five years of college entrance examination) The (Shanghai) ecological solution involves the synthesis of agricultural fertilizer, which is fermented to produce a mixture of methane, carbon dioxide and nitrogen. 2.016 L (standard condition) the gas is produced by a hard glass tube with a red CuO powder. The reaction is: CH4 + 4CuO CO2 + 2H2O + 4Cu. When the methane completely reacts, the quality of the hard glass tube is reduced by 4.8 g. The gas generated by the reaction will be absorbed by an overdose of clarification of the limewater, and the precipitation will be 8.5 g. (1) the amount of methane in the original mixture is ____________. (2) what is the volume fraction of nitrogen in the original mixture? (write the calculation) 2. (08 Shanghai) baking soda, stomach shu, and pingda xi are commonly used drugs to neutralize gastric acid. (1) the baking soda tablets contain 0.5 gNaHCO3, 2 slices of baking soda and stomach acid completely neutralized, and the neutralized H + is ___________mol. (2) the stomach shu ping contains 0.245 gAl (OH) 3. To neutralize stomach acid, 6 pieces of baking soda are equivalent to the stomach. (3) dhis chemical composition is basic salt of aluminum and magnesium. So you take this base salt of 3.01 grams, and you add 2.0 moles. Hydrochloric acid to dissolve the L - 1, when adding hydrochloric acid 42.5 mL, began to join the hydrochloric acid to produce CO2 45.0 mL reaction completely, calculated the basic salt samples hydroxyl and the ratio of the amount of substance of carbonate ions. (2) in the above basic salt soluble in hydrochloric acid after adding too much sodium hydroxide solution, filtration, precipitates after drying weighs 1.74 g, if the mass fraction of hydrogen in the basic salt is 0.040, try to speculate the basic salt chemical formula. P