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【简答题】
X、Y、Z为周期表中前20号主族元素，原子序数递增，X、Y原子的最外层电子数是其电子层数的2倍，Z是人体含量最高的金属元素． （1）下列含氧酸根化学式书写不正确的是______（填序号）． a．XO 3 - b．XO 3 2- c．YO 3 2- d．Y 2 O 3 2- （2）X、Y的原子可构成只含极性键的非极性分子，它的电子式是______，空间构型是______． （3）Y的最高价含氧酸是重要的化工产品． ①已知YO 2 被空气氧化，每生成1mol气态YO 3 ，放出98.3kJ热量，该反应的热化学方程式是______． ②实验测得相同条件下一定量的Y单质分别在空气和在氧气中充分燃烧后产物的成分（体积分数）如表． YO 2 YO 3 空气 94%～95% 5%～6% 氧气 97%～98% 2%～3% Y在纯氧中燃烧产物里YO 3 含量比空气中少的原因是______． ③天然ZYO 4 既可用于制备Y的氧化物又可用于制水泥．ZYO 4 与X单质在高温下反应，得到两种常见气体．每消耗1molX单质，有4mol电子转移，该反应的化学方程式是______． （4）为了测定某水泥样品成分，称取10.0g样品，将其中的Z元素转化为ZX 2 O 4 沉淀，将沉淀用稀酸处理得H 2 X 2 O 4 溶液，取该溶液体积的1/100，用KMnO 4 溶液滴定（氧化产物为XO 2 ，还原产物为Mn 2+ ），结果用去0.0200mol?L -1 的KMnO 4 溶液24.00mL．该样品中Z的氧化物的质量分数是______．
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【简答题】Billy’s favorite color is orange. But he can’t see what orange looks like. Billy is blind. A month after he was born, his mother noticed that his eyes weren’t quite as big as a normal baby’s.”Billy wo...
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【单选题】Billy is going to buy a pair of running shoes from Amazon. Which of the following is the size of the shoes?
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378
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【简答题】Billy’s favorite color is orange. But he can’t see what orange looks like. Billy is blind. A month after he was born, his mother noticed that his eyes weren’t quite as big as a normal baby’s.”Billy wo...
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【单选题】使用GET方式提交数据、接收数据时,处理中文最直接有效方式是( )。
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查看完整题目与答案
【单选题】Billy is going to buy a pair of running shoes from Amazon. Which of the following is the size of the shoes?
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378
B.
64.94
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查看完整题目与答案
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