通过学习,我们知道了常见气体的实验室制取方法和相关性质,我能根据所学知识回答下列

题型:问答题

问题:

通过学习,我们知道了常见气体的实验室制取方法和相关性质,我能根据所学知识回答下列问题:

(1)图1是实验室常用的制取气体的装置:

实验室用高锰酸钾制取氧气的化学方程式是______,所选用的发生装置是______(填序号),用C装置收集氧气后,验满的方法是______.

(2)小丽欲使用图2装置收集较纯净的氧气,则应先将装置中装满水______,再将气体从______(填“a”或“b”)端通入.

(3)小丽用排新制的澄清石灰水______的方法收集了半瓶氧气,然后将燃着的木炭伸入该集气瓶中继续做气体性质实验,我能观察到的现象是______,我能写出二氧化碳和澄清石灰水发生反应的化学方程式______.

(4)炼铁的原理是利用一氧化碳与氧化铁反应.在实验室里,可用图3所示装置进行实验:实验中玻璃管内的粉末由红色变为______色,该反应的化学方程式为______,通过实验我可以得出的一氧化碳的相关化学性质是______.

考点:氧气的制取和收集一氧化碳还原氧化铁氧气的检验和验满
题型:问答题

单端固位桥的适应证,错误的是()

A.基牙有良好的支持条件

B.基牙有良好固位

C.缺隙小

D.应力小

E.为了少磨牙

题型:问答题

Long ago, in days of the Roman Empire, people used to believe a god of farmings called “Saturn”. They believed that Saturn could make the weather good or bad, and that he had the power to control how much rain would fall.

Before a Roman farmer would plant his fields, he would try to get Saturn to give him good weather. He believed that if he killed an animal for Saturn, that would make Saturn happy. Then Saturn would make sure that the weather was good.

Not only did the people name a planet after Saturn but they also name a day of the week after him. They called this day “Saturni dies”, Latin words which mean “day of Saturn”. In English those words became Saturday.

6. What was Saturn believed to be in charge of?

A. Rainfall.    B. The power of nature.   C. Farming.    D. Days in a week.

7. Why did a Roman farmer kill an animal before planting his fields?

Because      .

A. killing an animal would bring him good luck

B. Saturn enjoyed eating animals

C. Saturn was happy to see animals being killed

D. he wanted to please Saturn so that Saturn would make the weather good for his planting

8. Which of the following is NOT TRUE?

A. Saturn is also the name of planet.

B. The Roman people used to believe Saturn to be their god.

C. Saturn was named for the last day of the week.

D. Saturn had three meanings.

9. What’s the aim of the author in writing this passage?

A. How the Romans worshipped (崇拜) Saturn.

B. Why the Romans believed in Saturn.

C. The different meanings of the word Saturn.

D. How Saturday got its name.

题型:问答题

烤瓷牙烧烤后表面光滑度好,但出现凹凸不平的颗粒状或坑洼状表面,最可能的原因是()

A.颈缘瓷过长

B.筑瓷过程中没注意吸干水分

C.烤瓷炉真空度不够

D.咬合关系太紧

E.金瓷不匹配

题型:问答题

2009年12月29日,山东省教育厅发出相关通知,要求规范传统文化课程教学,各地中小学在开展经典诵读时不可不加选择地全文推荐《三字经》等内容,要“取其精华,去其糟粕”。这里运用的矛盾分析方法是()

A.两点论和重点论统一

B.办事情要善于抓住重点,统筹兼顾

C.两分法、两点论

D.看问题要分清主流和支流

题型:问答题

性格是个体人格差异的核心。

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