以下两幅微观示意图揭示了化学变化的微观实质。相关说法中错误的是
A．化学变化前后原子的种类、数目都是守恒的
B．原子在化学变化中是可以再分的
C．左图表示的是化合反应
D．右图表示的是中和反应
答案：B
题目分析：根据图示，结合化学变化的微观实质分析。
A、在化学变化前后，原子是不变的，包括原子的种类和数目都不变，正确；
B、在化学变化中，原子不能再分，只是重新组合，错误；
C、左图中，氢气和氯气反应生成氯化氢，是两种物质反应生成了一种物质，符合化合反应的特点，正确；
D、右图中，氢氧化钠与硫酸反应生成硫酸钠和水，是酸和碱反应生成盐和水的中和反应，正确。故选B
点评：本题主要考查了学生对于化学变化实质的理解，并能根据微观示意图分析解答相关问题，同时还需熟练掌握化合反应、中和反应的相关知识。
| 完形填空。 | ||||
| He lost his arms in an accident that claimed his father's life who was the main 1 of support for the family. He had to 2 the arms of his younger brother, and his younger brother became his 3 , never leaving him alone for years. Except for writing with his toes, he was completely unable to do 4 in his life. One late night, his younger brother accompanied him into the toilet and went back to 5 . But being so 6 , his younger brother fell asleep, leaving him on the toilet for two hours. As the two brothers grew up together, they had their share of problems and they would often 7 . His younger brother wanted to live 8 from him, living his own life, as many normal people do. So he was 9 and didn't know what to do. A 10 misfortune befell (降临) a girl. One night her mother, who suffered from mental illness 11 . So her father went out looking for her mother, leaving her alone at home. She tried to prepare a 12 for her parents, only to overturn the stove, 13 in a fire which took her hands away. Though her elder sister who was studying in another city, showed her 14 to take care of her, she was determined to be completely 15 . At school, she always studied hard. One day, the boy and the girl were both invited to appear on a television interview program. They were both asked to write something on a piece of paper with their toes. The boy wrote: My younger brother's arms are my arms; 16 the girl wrote: Broken wings, flying heart. Disasters can 17 at any time. If you choose only to complain and 18 from the ordeal (苦难的经历), it will always follow you wherever you go. But if you decide to be 19 , the hardship will turn out to be a(n) 20 on which new hopes will arise. | ||||
|
，钙原子核内质子数为________，它在化学反应中易________（填“得”或“失”）电子。