题目

下列热化学方程式书写正确的是(△H的绝对值均正确)( )A. 2NO2 = O2 + 2NO △H=+116.2kJ/mol(反应热)B. NaOH(aq)+HCl(aq)= NaCl(aq)+H2O(l) △H=+57.3 kJ/mol(中和热)C. C2H5OH(l)+3O2(g)= 2CO2(g)+3H2O(g) △H=﹣1367.0 kJ/mol(燃烧热)D. S(s)+O2(g)= SO2(g) △H=﹣296.8 kJ/mol(反应热) 答案:【答案】D【解析】A.热化学反应方程式要注明物质在反应时的状态,故A错误;B.中和反应是放热反应,△H应小于0,故B错误;C.燃烧热要求可燃物的物质的量必须为1mol,得到的氧化物必须是稳定的氧化物,H2O的状态必须为液态,故C错误;D.热化学方程式的书写注明了物质的聚集状态、△H的正负号完型填空。It’s Sunday today. The weather_____fine. Tom and John have a big party ____ home. They invite many friends to come. They sing and dance together. Tom is cool. He plays____ piano. He also sings many ____ songs. John is cool, too. He plays the guitar. He sings a Chinese song“The Jasmine Flower”.They have _____ good time.【1】A. amB. isC. are【2】A. atB. inC. on【3】A. aB. theC. /【4】A. englishB. chineseC. English【5】A. aB. theC. an
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