英语周报2021-2022高二第57期答案

16.〈共14分1)取少量溶液于试管中,滴入几滴KSCN溶液,若显血红色,则含有Fe3+,溶液被氧化〈2分(2)Al2O3+20H=2AO2+H2O(2分(3)硫酸(H2SO4)(1分)铁粉(Fe)(1分)4)防止溶液中的Fe+被空气氧化为Fe+(1分)Ⅲ.(5)氧化剂、还原剂(2分)2Na2O2+2CO2=2Na2CO3+O2(1分)(6)①2Fe(OH)3+3Clo+40H=2FeO42+3c}+5H2O(2分)②0.15(2分

ear jonaIm glad to hear from you and i d like to share withyou something about serving chopsticksi As you know, people in China are encouraged to useserving chopsticks, which are different from personal chopticks in shape and colour serving chopsticks are used totake food from shared dishes. You can add food to yourbowl with them, but never place them into your mouth oryour own bowlUsing serving chopsticks benefits everyone at tableFirst of all, it prevents diseases from' spreading while weare eating together. We can also use them to put food intoothers bowls, thus creating a pleasant and harmoniousdining atmosphereHoping you'l come to China to experience themfirst handYoourL i hua

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