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I、某化学课外活动小组对污染大气的部分非金属氧化物进行探究。请根据题目要求回答下列问题。 (1)写出用硝酸制取NO的离子方程式 。 (2)查资料得知,HCOOH CO+H2O。实验室有如图l所示的装置,制取CO气体可选用的装置为 (填序号),实验室利用该装置还可制取的常见气体有 (写一种气体的分子式)。 (3)查资料得知,利用催化剂可使汽车尾气中的一氧化碳和氮氧化物大部分发生反应转化为二氧化碳和氮气。该小组在实验室模拟汽车尾气处理,设计了如图2所示装置(部分夹持和装置已略去)。 ①实验前,关闭旋塞K,先通氮气排净装置中的空气,其目的是 。 ②装置(III)的主要作用是 。 ③该套装置中有不完善之处,还应在装置(Ⅳ)后补充 装置。 II、该课外小组设计的从ZnSO 4 、FeCl 3 的混合溶液中制取ZnSO 4 ·7H 2 O过程如下: a.在混合液中加入6 mol/L NaOH溶液,至pH=8为止。 b.过滤后得到沉淀,用蒸馏水多次洗涤沉淀。 c.向洗涤后的沉淀中加入2 mol/L的硫酸,保持溶液的pH在4~6,加热煮沸,趁热过滤,滤液即为ZnSO 4 溶液。 d.滤液中加入2 mol/L的硫酸,使其pH=2。 已知部分阳离子以氢氧化物的形式开始沉淀至完全沉淀时溶液的pH见下表,回答下列问题: 沉淀物 Fe(OH) 3 Zn(OH) 2 pH 1.5~3.2 6.4~8.0 (1)步骤b中如何检测沉淀已经洗涤干净 。 (2)步骤d中加入硫酸,使其pH=2的目的是 ;要制得ZnSO 4 ·7H 2 O的步骤d还缺少的操作是 ,所用的主要硅酸盐仪器是 。
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参考答案:
举一反三
【多选题】选词填空: Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need. (请在答案处填写 大写字母 !!!)
A.
repetitive
B.
continually
C.
alerts
D.
pattern
E.
locate
F.
mental
G.
challenge
H.
network
I.
evolving
J.
reversely K. literacy Bill Drayton believes we’re in the middle of a necessary but painful historical transition. For millenniums most people's lives had a certain ___1___. You went to school to learn a trade or a skill-baking, farming or accounting. Then you could go into the workforce and make a good living repeating the same skill over the course of your career. But these days machines can do pretty much anything that's ___2___. The new world requires a different sort of person. Drayton calls this new sort of person a changemaker. Changemakers are people who can see the patterns around them, identify the problems in any situation, figure out ways to solve the problem, organize fluid teams, lead collective action and then ___3___ adapt as situations change. For example, Ashoka fellow Andrés Gallardo is a Mexican who lived in a high crime neighborhood. He created an app, called Haus, that allows people to ___4___ with their neighbors. The app has a panic button that ___5___ everybody in the neighborhood when a crime is happening. It allows neighbors to organize, chat, share crime statistics and work together. To form and lead this community of communities, Gallardo had to possess what Drayton calls "cognitive empathy-based living for the good of all." Cognitive empathy is the ability to perceive how people are feeling in ___6___ circumstances. "For the good of all" is the capacity to build teams. It doesn't matter if you are working in the cafeteria or the inspection line of a plant, companies will now only hire people who can ___7___ problems and organize responses. Millions of people already live with this mindset. But a lot of people still inhabit the world of following rules and repetitive skills. They hear society telling them: "We don't need you. We don't need your kids, either." Of course, those people go into reactionary mode and strike back. The central ___8___ of our time, Drayton says, is to make everyone a changemaker. In an earlier era, he says, society realized it needed universal ___9___. Today, schools have to develop the curriculums and assessments to make the changemaking mentality universal. They have to understand this is their criteria for success. Ashoka has studied social movements to find out how this kind of ___10___ shift can be promoted. It turns out that successful movements take similar steps.
【简答题】Write a letter according to the following request, write your answer on the ANSWER SHEET. 代理关系 感谢贵行×年×月×日来函。 关于贵行建立直接业务关系的提议,我们正在考虑我们两行的业务量是否值得建立这样的直接关系。你行也许了解,目前我们两国的业务量有限。现在这种把委托我行的业务通过苏黎世的瑞士银行来办尚可应...
【单选题】语境中的具体含义(Para.4) locate Directions: 请仔细阅读课文,选择以下单词或词组在上下文中的具体含义 (Para.4) locate(句子:Water had to be hauled in and stored in two tanks located on the property. )
A.
使安置于
B.
使座落于
【多选题】Request对象中的方法有()。
A.
Form
B.
Cookies
C.
Querystring
D.
Write
【单选题】在数据采集与传送中,传送断路器操作信息,该方式定义为:
A.
遥测
B.
遥信
C.
遥控
D.
遥调
【简答题】男,35岁,消化性溃疡并发瘢痕性幽门梗阻,反复呕吐宿食,消瘦,皮肤干燥,弹性消失,入院后拟在硬脊膜外麻醉下行胃大部切除术。该患者入院时的主要护理诊断是A、心排出量减少 B、体液不足 C、组织灌注量改变 D、活动无耐力 E、知识缺乏 能促进吻合口愈合的重要术前护理是A、心理护理 B、皮肤准备 C、特殊胃肠道准备 D、备血、皮试 E、术前用药
【判断题】当晶闸管承受反向电压时,无论门极是否有触发电流,晶闸管都不会导通。
A.
正确
B.
错误
【判断题】浮动汇率制是指中央银行只在一定范围内调整一国汇率的变动。(    )
A.
正确
B.
错误
【单选题】( ) 港是指全部或绝大多数外国商品可以免税进出的港口,划在一国的关税国境(即“关境”)以外。
A.
基本
B.
枢纽
C.
自由
D.
中心
【简答题】Francis Bacon, one of the most important British _______, was active in the English Renaissance.
相关题目:
【多选题】选词填空: Directions: Fill in each blank with a proper word chosen from the box. Each word can be used only once. Note that there is one word more than you need. (请在答案处填写 大写字母 !!!)
A.
repetitive
B.
continually
C.
alerts
D.
pattern
E.
locate
F.
mental
G.
challenge
H.
network
I.
evolving
J.
reversely K. literacy Bill Drayton believes we’re in the middle of a necessary but painful historical transition. For millenniums most people's lives had a certain ___1___. You went to school to learn a trade or a skill-baking, farming or accounting. Then you could go into the workforce and make a good living repeating the same skill over the course of your career. But these days machines can do pretty much anything that's ___2___. The new world requires a different sort of person. Drayton calls this new sort of person a changemaker. Changemakers are people who can see the patterns around them, identify the problems in any situation, figure out ways to solve the problem, organize fluid teams, lead collective action and then ___3___ adapt as situations change. For example, Ashoka fellow Andrés Gallardo is a Mexican who lived in a high crime neighborhood. He created an app, called Haus, that allows people to ___4___ with their neighbors. The app has a panic button that ___5___ everybody in the neighborhood when a crime is happening. It allows neighbors to organize, chat, share crime statistics and work together. To form and lead this community of communities, Gallardo had to possess what Drayton calls "cognitive empathy-based living for the good of all." Cognitive empathy is the ability to perceive how people are feeling in ___6___ circumstances. "For the good of all" is the capacity to build teams. It doesn't matter if you are working in the cafeteria or the inspection line of a plant, companies will now only hire people who can ___7___ problems and organize responses. Millions of people already live with this mindset. But a lot of people still inhabit the world of following rules and repetitive skills. They hear society telling them: "We don't need you. We don't need your kids, either." Of course, those people go into reactionary mode and strike back. The central ___8___ of our time, Drayton says, is to make everyone a changemaker. In an earlier era, he says, society realized it needed universal ___9___. Today, schools have to develop the curriculums and assessments to make the changemaking mentality universal. They have to understand this is their criteria for success. Ashoka has studied social movements to find out how this kind of ___10___ shift can be promoted. It turns out that successful movements take similar steps.
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