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A卷原子墩:H…1 c一12 N—14 0—16 Na一23 Mg川一24 Al一27 S一32 C卜一35.5 Call一一 40 Cu一64 Zn一一65 一、选择题(共30分,俅小题2分) 1.化学变化的特征是( ). A.发光发热 B.有沉淀生成 c.放出气体 D.生成r新物质 2.卜列物质巾属于纯净物的是( ). A.澄清的行灰水 B.冰水混
A volume atom atomic pier: H ... 1 c 12 N - 14 0 - 16 Na 23 Mg Chuanyi 24 Al - 27 S - 32 C Bu - 35.5 Call - 40 Cu - 64 Zn - 65 First, multiple-choice questions ( A total of 30 points, 2 questions) 1. The characteristics of chemical changes are (). A. Luminescence fever B. Precipitation generated c. Emission of gas D. Generate r new material 2. Bu column towel is pure material is () A. Clarified ash water B. Ice water mixing