2022年英语周报答案

书面表达One possible version:NOTICEA sports meeting will be held in the playground of our school from next Thursday to FridayAs you know, the pressure of study is very heavy now, especially for those senior 3. So the purpose of the sports meeting is to letevery student get relaxed, as a result of which we students can live happily and heal thilyEveryone is welcome to take part in it. Those who perform excellently at the sports meeting will get prizes. But don' t take theresults so serously because taking part is more important than the result. Good luck to everyone!

26.(14分)【答案】(1)3)3886(2分)HH德H:N:N:H(1分焙烧(2)CU:e eH SO, 20,--2CuSO, TeO, (③4.0×10-°(2分)(4)将Ag完全转化为Ag2O,避免温度过高Ag2O分解(2分,答案合理即给分)(5)4Ag(NH3 )t NH,.H, tN2↑ 4NH 4NH2↑ H2O(2分)(6)正(1分)TeO 4e- 3H2O=Te 6OH-(2分)【解析】(1)Te是52号元素,原子结构示意图为452)2818186,NH是共价化合物,其电子式为H:N:N∴H。(2)根据流程可以判断反应物为Cu2Te、H2SO4和O2,产物为 Cuso4、TeO2和H2O,故反应方程式为Cu2Te 2H2SO4 20烧2CuSO, TeO, 2H, O.(3) KKK[Cu(OH),=4.0×10-。(4)过滤2后的滤渣是Ag和Au,低温下将完全转化为Ag2O,避免温度过高Ag2O分解,生成的Ag2O与氨水反应实现Ag和Au的分离。(5)根据题意滤液3为Ag(NH),其与N2H4·H2O反应生成Ag和N2,属于氧化还原反应,结合元素守恒和电荷守恒,可知离子方程式为:4Ag(NH3) NH:H0一, N, 4NH1↑ H2O(6)电解制备Te的电极反为:TO 4c 3HO=Te得电子在阴极进行,b电极为电源的正度。

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