2022英语周报二年级上册答案

20.(10分)(1)无水硫酸铜(1分(2)①4NH+5024NO+6H2O(2分)②有红棕色气体出现,玻璃管内壁附着有水珠(2分)(3)①2SO2+2Na2O2-2Na2SO2+O2(2分)②SO2+Na:O2a2SO4(2分)③淡黄色固体粉末逐渐变为白色(1分【解析】(1)氧化铜与氢气反应生成水,再用无水硫酸铜检验水(2)①氨的催化氧化反应的化学方程式为4NH十502 4NO+++++++6H, O②NO可能会与O2反应生成NO2,故装置B中可能观察到的现象为有红棕色气体出现,玻璃管内嬷附着有水(3)①若将带火星的木条靠近E的导管口,木条复燃说明生成了氧气,SO2表现酸性氧化物的性质,B中发生反应的化学方程式为2SO2+2Na2O2a2SO,+O,②若在E的导管口未收集到任何气体,SO2只表现还原性,则装置B中发生反应的化学方程式为SO2③装置B中观察到的现象是淡黄色固体粉末逐渐变为白色,

Paragraph 1Now we are at the crossroads. Turn left hereman told poI m quite lost now. Are you sure youknow the way? " Polly asked. "Where is the tall man?Arethese two men bad guys? Thinking of these questions toherself, Polly couldnt help starting to feel frightenedagain.You really shouldnt feel anxious.Here we areKing Street. The old man stopped. "Thank you so muchfor coming to my aid, said Polly in relief. "Would youlike to come in and rest for a while?”“lt’ s very nice ofyou," said the old man,“butI' be off.”Paragraph 2Theola man turneded back and Polly curiously askedwhere he was going. "There may be more people losttoday, and Id like to help them. You see, a fog this badis rare. It gives me the chance to pay back the help thatpeople give me when it is sunny. A blind person like mecan't get across the road without help, except in a fog likethis. Seeing the old man feeling his way forward with thestick, Polly felt a warm glow spread through her body.Shewas already in tears before she knew it

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