英语周报初一2022-2022答案

角大色12.(1)双氧水热稳定性弱，温度过高时H2O2容易分解(2)Co2O2+H2O2+4Ht—2Co2++3H20+02↑(3)2.5~3.3萃取剂在该pH时对Ni+、Co+萃取率差别大，能分离Ni+、Co2+两种离子(4)2C0,(0H,C0,+0,商墨2Co,0,+2H,0+2C0,(5)硫酸铵【解析】含钻废料（主要成分为Co2O,含有少量MnO2、NiO、FeO,)中加入硫酸和H2O2酸浸，MO2不溶，其他物质都溶解，从后续产物看，Co2O被HO2还原为Co2+,FeO,溶解，同时生成的Fe2+被氧化为Fe+;调pH至3.7，Fe3+转化为Fe(OH)3沉淀；加入萃取剂后Ni+进入有机相，Co+进入水相；加入NH,HCO3和氨水，Co+转化为Co(OH)2CO沉淀，滤液中应含有(NH),SO;高温煅烧时，C02(OH)2C02中Co2+由+2价升高到十3价，不是简单的分解反应，而是分解产物又与O2反应，生成Co2O3、H2O和CO2。

书面表达One possible versionDear PeterI'm writing to invite you to see the Chinese Painting Exhibition to be held in our city.The exhibition will start at 8: 30 am on Saturday and last till 5: 00 pm on Sunday in the city museum It'ssaid that a large number of Chinese paintings, some of which are original works by famous painters like ZhangDaqian and Qi Baishi, will be on display. Besides, there will be various souvenirs to be sold. I know you re veryinterested in traditional Chinese culture, so I can t wait to tell you the news and hope we can go together.Looking forward to your reply.You

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