用酒精灯时,以下哪种操作正确?( )A. 点火时用火柴点B. 点火时用另一个点着的灯去点C. 灭火时可用嘴去吹D. 灭火时要用灯帽盖灭

下列物质中在一定条件下即能发生氧化反应,又能发生还原反应是( )A. 乙醛B. 丙酮C. 乙酸

[单选] 国际纯粹化学和应用化学联合会将作为标准物质的化学试剂按纯度分为（）。A. 6级B. 5级C. 4级D. 3级

2. Lambert-Beer 定律是描述 __ 与 __ 和 __ 的关系,它的数学表达-|||-式为 __ 。

对带有刻度的计量仪器，干燥方法是（）。A. 加有机溶剂B. 烘干C. 烤干D. 吹干

某反应,无论反应物初始浓度为多少,在相同时间和温度时,反应物消耗的浓度为定值.此反应是( ).A. 负级数反应B. 一级反应C. 零级反应D. 二级反应

燃烧三角形发生的必要条件不包括( )A. 助燃物B. 引火源C. 链式反应自由基D. 可燃物

对固态酸、碱可用手直接操作。A. 对B. 错

10.5 完成下列转化:-|||-a.-|||-OH-|||-b. (H)_(3)C(H)_(2)C(H)_(2)Brarrow C(H)_(3)C(H)_(2)C(H)_(2)COOH-|||-C. (C(H)_(3))_(2)CHOHarrow (C(H)_(3))_(2)CCOOH-|||-OH-|||-CH3 O-|||-O-|||-d.-|||-O-|||-CH3 O -0-|||-e. (C(H)_(3))_(2)C=C(H)_(2)arrow (C(H)_(3))_(3)CCOOH-|||-COOH-|||-f. 一-|||-g. equiv CHarrow C(H)_(3)COO(C)_(2)(H)_(5)-|||-h. 0-|||-i. (H)_(3)C(H)_(2)C(O)_(2)Harrow C(H)_(3)(C(H)_(2))_(3)COOH-|||-j.CH3 COOH- →CH2((COOC2H5 )2-|||-k. 0 CH2COONH4-|||-CH2CONH2-|||-CO2CH33 COOH-|||-1.-|||-OH O2CCH310.5 完成下列转化:-|||-a.-|||-OH-|||-b. (H)_(3)C(H)_(2)C(H)_(2)Brarrow C(H)_(3)C(H)_(2)C(H)_(2)COOH-|||-C. (C(H)_(3))_(2)CHOHarrow (C(H)_(3))_(2)CCOOH-|||-OH-|||-CH3 O-|||-O-|||-d.-|||-O-|||-CH3 O -0-|||-e. (C(H)_(3))_(2)C=C(H)_(2)arrow (C(H)_(3))_(3)CCOOH-|||-COOH-|||-f. 一-|||-g. equiv CHarrow C(H)_(3)COO(C)_(2)(H)_(5)-|||-h. 0-|||-i. (H)_(3)C(H)_(2)C(O)_(2)Harrow C(H)_(3)(C(H)_(2))_(3)COOH-|||-j.CH3 COOH- →CH2((COOC2H5 )2-|||-k. 0 CH2COONH4-|||-CH2CONH2-|||-CO2CH33 COOH-|||-1.-|||-OH O2CCH3

羧酸衍生物水解反应的活性次序是:酰卤>酸酐>酯>酰胺。A. 正确B. 错误

热门问题