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原子量:C—12 O-16 H—1 S—32 Cl—35.5 Ba—137 Cu—64 Na—23 Mg—24 Al—27 Ag—108 一、单选题(共20分,每题1分.每题只有一个正确答案) 1.下列变化属于化学变化的是( ). (A)天然金刚石琢磨成钻石 (B)醋酸凝结成像冰一样的晶体
Atomic weight: C—12 O-16 H—1 S—32 Cl—35.5 Ba—137 Cu—64 Na—23 Mg—24 Al—27 Ag—108 First, single choice question (total 20 points, 1 point for each question. There is only one correct answer for each question.) 1. The following changes are chemical changes (). (A) Natural Diamond Honing into Diamonds (B) Acetic Acid Condensation Imaging Ice Crystals