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第1卷 一、选择题 1.下列变化一定属于化学变化的是( ) ①变色 ②导电 ③燃烧 ④爆炸⑤白磷转变成红磷 ⑥工业制氧气 ⑦久置浓硝酸变黄 (A)①⑥ (B)②④ (C)④⑤⑥ (D)③⑤⑦ 2.下列各组指定原子序数的元素,能够形成A_2B_3型化合物的是( ) (A)12和17 (B)11和9 (C)13和8 (D)16和8 3.H~-和H~+的微粒半径前者比后者( ) (A)大 (B)小 (C)相等 (D)不能确定 4.乙酸分子在气态时能形成二聚分子:现要测定乙酸的分子量,应采用的条件为( )
Volume 1 I. Multiple-choice questions 1. The following changes must be chemical changes () 1 Discoloration 2 Electrically conductive 3 Combustion 4 Explosion 5 White phosphorus Conversion to red phosphorus 6 Industrial oxygen 7 Concentrated nitric acid Yellowing (A) 16 (B )24 (C)456 (D) 357 2. The following groups specify atomic number elements that are capable of forming A_2B_3 type compounds () (A)12 and 17 (B)11 and 9 (C)13 and 8 (D) ) 16 and 8 3. The particle radii of H(H) and H(+) are larger than the latter () (A) larger (B) smaller (C) equal (D) cannot be determined 4. Acetic acid molecules can form dimerization in the gas state Molecular: Now we want to determine the molecular weight of acetic acid, the conditions should be used ()