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可能用到的原子量 :Ｋ 3 9 Ｃｌ 3 5 5 Ｏ 1 6 Ｍｎ 5 5 Ｍｇ 2 4 Ｚｎ 65 Ｃ 1 2 Ｈ 1 Ｆｅ 5 6 Ｎａ 2 3一、单项选择题 (每小题 2分 ,共 40分 )1 物质发生化学反应的本质特征是 ( ) .(Ａ)有两种以上新物质生成 (Ｂ)状态和颜色发生了变化(Ｃ)有放
Possible atomic weight: K 3 9 Cl 3 5 5 O 1 6 Mn 5 5 Mg 2 4 Zn 65 C 1 2 H 1 Fe 5 6 Na 2 3 I. Single-choice questions (2 points for each question, 40 points total) )1 The essential characteristic of the chemical reaction of a substance is (). (A) There are two or more new substances generated (B) The state and color have changed (C) There is