题干

下列关于反应热的说法正确的是

A:当∆H为“-”时,表示该反应为吸热反应

B:已知C(s)+O2(g)=CO(g)的反应热为110.5kJ/mol,说明碳的燃烧热为110.5kJ

C:反应热的大小与反应物所具有的总能量和生成物所具有的总能量无关

D:化学反应的反应热只与反应体系的始态和终点状态有关,而与反应的途径无关

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答案(点此获取答案解析)

D

同类题1

     What would you do if you found a snake in your house? Many people might be afraid or try to kill it. However, if you live in North Carolina in the USA, one thing you can do is to call the Snake Catchers.
    The Snake Catchers are four men who love snakes, even poisonous ones. Their newspaper advertisement says, “Snake Catchers: free snake removal(除去)一Please do not kill them — Call us. ”
    The Snake Catchers, who started their service in 1998, don't charge anything for helping people. “We do this as a hobby,” explained Fred Johnson, one of the Snake Catchers.
    Because of their love of snakes, the Snake Catchers try to keep them alive. “One man asked us to kill a python(蟒蛇), so he could make a pair of boots from the skin. We refused, because we like snakes, and we don't want to see them killed, ” said Fred.
Some of the snakes that they catch are kept as pets; some are given to the North Carolina State University. Most, including the poisonous snakes, are set free in the wild, usually in a national park.
    Fred suggests that people should treat snakes with care. “Actually snakes are very shy and gentle creatures. They only attack if they are frightened. However, you have to know how to treat a snake properly!”
    According to one happy family, the Snake Catchers are good. One day, the Greenwood family found a snake skin in the kitchen. They looked very carefully and saw a snake sleeping behind a cupboard. They thought about what to do. Then Steve Greenwood remembered the advertisement for the Snake Catchers. He called them.
  “The Snake Catchers arrived within an hour and they finished the job quickly too,” said Steve Greenwood. “One of them went into the kitchen, found the snake and took it out alive. The Snake Catchers did a very good job.”
Last year, the Snake Catchers removed more than seventy snakes from houses in North Carolina.