2022英语周报高一提高26答案

Our school had a school choir competition June 20. As Panning, the competition tookonplannedplace in the main hall. I was very nervousafter we began to perform. Hid!"IStartto have thebeforestartedhiccups(t] WM). Lisa advised me to hold my breath and countedto ten, while Amy brought somecountwarm water and asked me to drinkthemwaItMy friends tried to help me in manybut nothingwaysworked."BOO! " Tony frightened me from behind my back. I was Suchsurprised that my hiccupsstopped, At last, we sang inbeautifully harmony on the stage.beautiful

15.【答案】(除标注外,每空2分)(1)2C203 4N2CO2 3MN2CO4 4CO2(2)fe2O3(1分)、H12SiO3(1分)(3)2C02 2H=Cr207 H2O,加入硫酸平衡正向移动,CO2转化为Cx202(4)ade(5)5.6(6)中和硫酸提高pH、促进C水解沉淀(7)4C02 3HCH0 4H2O==4Cr(OH)31 20H 3c03焙烧【解析】(1)2Cr2O3 4Na2CO3 302=4N2CnO4 4C02(2)铬矿石(主要成分是C203,含FeO、SO2等杂质)中加入纯碱和氧气,高温下,sO2和纯碱反应生成硅酸钠,FeO被氧化为氧化铁,固体1为Fe2O3,酸化后固体2为H25O3(3)2C02 2H=Cr202 H2O,加入酸平衡正向移动生成c0O7(4)重铬酸钾溶解度随温度变化很大,且0℃在水中溶解度小;(5)为了使Cx3完全沉淀[此时,c(C3)≤105mol·L1],根据K甲[Cx(OH)]=c(Cr2)e(OH)=6.4×103,c(OH)=4×10-9ml·L1,则c(H)=10/(4×10°)mlL2=0.25103mol·L',pH=5.6;(6).中和硫酸提高pH、促进Cx水解沉淀(7)HCHO中碳元素化合价为0价,该反应在碱性环境下进行,最终生成Na2CO3、Cr(OH)3等,根据化合价升降守恒、电荷守恒以及原子守恒可知其反应的离子方程式为:C0 3HCO 4H20=4Cr(OH)31 20H 3C03

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