题目

依据事实，写出下列反应的热化学方程式。 （1） 在25℃、101kPa下，1g甲醇燃烧生成CO2和液态水时放热23.0kJ。则表示甲醇燃烧热的热化学方程式为。 （2） 若适量的NO和O2完全反应，每生成23g NO2需要放出17.0kJ热量。 答案：【1】CH3OH（l）+ 32 O2(g)=CO2(g)+2H2O(l)△H=-736.0kJ/mol 【1】2NO(g)+O2(g)=2NO2(g)△H=-68 kJ/mol Scientists in the United States have developed a method that may help to predict earthquakes earlier. They say it could give people who live in deadly earthquake areas enough warning to leave before an earthquake occurs. Currently, the most modern systems for predicting earthquakes find them only a short time before the event. Like most strong earthquakes, Wenchuan earthquake in 2008 and Haiti earthquake in 2010 were not identified early enough for people to flee the area, killing hundreds and thousands of people.But scientists who study earthquakes are reporting that new technology could measure very small changes in the Earth’s surface. Scientists performed experiments along California’s San Andreas Fault, an area famous for its earthquakes. Highly sensitive electrical devices are placed about one kilometer below ground in two different places. The devices were able to measure even small changes in air pressure on the Earth’s surface. The scientists say such changes are caused when rocks pushed together, forcing air out of small cracks in the rock. Two earthquakes hit the area in late 2005. The first took place on Dec.25. A smaller earthquake struck five days later. The scientists noted changes in the earth’s surface about ten hours before the first quake struck. That quake measured three in intensity(强度). They then found similar changes taking place two hours before the other quake struck five days later. If additional tests confirm the changes are linked to earthquakes, the scientists believe their equipment could be used for early warning systems. A system that provides a warning signal ten hours before a major earthquake could help move people from the area and save lives. The scientists now hope they can find earthquakes with even greater intensity by placing their equipment deeper in the ground.71. What’s the best title for the passage?A.A new way to help predict earthquakes.B.The earthquakes in the worldC.A better understanding of earthquakeD.Scientists and modern systems of earthquakes72.If the new method does work, _______.A.fewer earthquakes will break outB.rescue workers can save more buried people in ruinsC.a warning can be given at least ten days before the major earthquakeD.fewer people will be killed in an earthquake73.According to the passage, the devices can predict the earthquake by______reaching the center of the earthquakedetecting the temperature changes in the earth’s crustmeasuring changes in air pressure on the Earth’s surfacerecording sound waves under the ground74.We can infer from the passage that ______.the equipment is perfect enough to be used in practiceit’s unknown if greater earthquake can be predicted by the equipmentthe deeper the equipment is placed, the more accurate the measurement isthe equipment has helped save many lives in the earthquake in Haiti .75.How many earthquakes are mentioned in the passage?A. One           B. Two           C. Three         D. Four