高二下
道粘膜有刺激作用,吸入浓度较大的乙醛蒸气会引起中毒现象。 乙醛的化学性质(与甲醛相似) (碳氧双键上的加成 ) (醛基碳氢键断裂后加氧) (1)银镜反应 :记住现象 (2)与新制氢氧化铜反应 : 记住现象 O CH3 C H + H2 催化剂 CH3CH2OH 与氢气加成的反应又叫还原反应
结构简式: CH3COOH 分子式: C2H4O2 三、化学性质 弱 酸性 : CH3COOH CH3COO- +H+ 酸性: HCl CH3COOH H2CO3 讨论:如何设计三个小实验,比较醋酸和盐酸的 酸性的强弱。 向醋酸钠中加入盐酸,有刺激性气味 2
C2H5 CH3— C— O— C2H5 + H2O a、 CH3— C— OH+H— O— C2H5 CH3— C— O— C2H5 + H2O 浓 H2SO4 = = O O CH3 C OH + H 18O C2H5 浓 H2SO4 = O = O CH3 C 18O C2H5 + H2O 酯化反应实质: 酸脱羟基醇脱 羟基上的 氢 原子 同位素原子示踪法 酸和醇作用生成酯和水的反应
变红。 焰色反应,火焰分别呈黄色、紫色(透过蓝色钴玻片)。 ( l) H+ ( 2) Na+、 K+ ( 3) Mg2+ 与 NaOH溶液反应生成白色 Mg(OH)2沉淀。 与适量的 NaOH溶液反应生成白色 Al(OH)3絮状沉淀,该沉淀能溶于过量的 NaOH溶液。 不能溶于过量的氨水。 ( 4) Al3+ ( 5) Fe3+ 与 KSCN溶液反应,变成血红色 Fe(SCN)3溶液;与
分子式 电子式 结构式 结构简式 分子结构特点 键的类型 分子极性 分子内各原子 的相对位置 二、乙烯的实验室制法 • 乙烯的实验室制法 • 乙烯的实验室制法的原理 • 浓硫酸
r opinion, the director pensates for the lack of plot by using visual effects and uses music to municate the feeling of the film. The woman talks about he plot of the film but she does not tell us
natives in the questions. Think about what they are going to talk about. • What are the important words you hear? These can help you identify the situation. • Sound effects also often help you
A Brave Patient Village Nightmare A Decisive Battle Feeling Helpless No More Fighting A B C D Match the titles. (pay attention to one extra title) Complete the gaps in Text B with these sentences.
n the stage. Ⅰ . Learn and use words to show different supposition and belief: Ⅱ . Learn something about humanlike robots, esp. the relationship between robots and humans beings. Summary: What we
consider, delay, deny, dislike, endure, enjoy, escape, five, finish, imagine, keep, mind, miss, pardon, prevent, resist, suggest, understand, can’t help Remember them! The following verbs are