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11 天
初中化学15个易错方程,抓紧看丢分率高!
生成CuO;(6)C是还原剂,CuO是氧化剂。 现象:黑色粉末逐渐变成光亮的红色物质,同时试管口有水滴生成 相关知识点:(1)实验开始时,应先通入一段 ...
高考网
25 天
2025年高考冲刺--化学实验题抓分神技
再加银氨溶液或Cu(OH)2悬浊液。 2.用pH试纸时,先用玻璃棒沾取待测溶液涂到试纸上,再把试纸的颜色跟标准比色卡对比,定出pH。 3.配制和保存Fe2+,Sn2+等易水解、易被空气氧化的盐溶液时;先把蒸馏水煮沸赶走O2,再溶解,并加入少量的相应金属粉末和相应酸。
click.ro
20 天
Site-ul partidului AUR, atacat de hackeri: „Traian Băsescu președinte. Avem o casetă ...
Hackerii susțin că au obținut acces la date confidențiale și înregistrări compromițătoare cu liderul partidului, George Simion, pe care le-au scos la vânzare. Totodată, apare și un mesaj referitor la ...
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