1.简答题- (共1题)
A、B两固体物质的溶解度曲线如图所示:

(1)在_______℃时,A和B的溶解度大小相等。
(2)要将30℃时A物质的不饱和溶液变成该温度下的饱和溶液,可以采取的措施是__________(答一条即可)。
(3)将30℃时A、B两物质的饱和溶液的温度降到10℃,此时,A、B两种溶液溶质质量分数的大小关系是____________。
2.推断题- (共1题)
材料:难溶于水的碱在加热的条件下,容易分解生成对应的金属氧化物和水。
A、B、C是中学化学中常见的化合物,A溶液呈蓝色,C是一种黑色金属氧化物。A、B、C的转化关系如图所示,请回答下列问题:

(1)向A中加入NaOH溶液时产生的现象是____。
(2)写出下列两个化学方程式:
① A

② C

3.计算题- (共1题)
Na2CO3与盐酸反应分两步进行:
第一步反应为:Na2CO3+HCl===NaCl+NaHCO3;
第二步反应为:NaHCO3+HCl===NaCl+H2O+CO2↑
取Na2CO3溶液100g,逐滴加入稀盐酸直到过量。反应过程中产生的气体质量与加入
的盐酸质量的关系如图所示:

(1)反应中最多可以产生CO2___________g。
(2)求Na2CO3溶液中溶质质量分数(要求书写计算过程)。
(相对原子质量:C—12、Na—23、H—1、O—16)
4.单选题- (共15题)
A.用活性炭可以降低水的硬度 |
B.可用pH试纸测定溶液的酸碱度 |
C.赤铁矿的主要成分氧化铁的化学式是FeO |
D.用KClO3制取O2时,加入MnO2可以增加生成O2的质量 |

A.该元素原子的最外层电子数为7 |
B.该元素的原子序数为19 |
C.该元素是金属元素 |
D.在化学反应过程中该元素原子容易失去电子形成阳离子 |
A.帕拉米韦的相对分子质量为328 g |
B.帕拉米韦是由15个碳原子、28个氢原子、4个氧原子、4个氮原子构成的 |
C.帕拉米韦是由碳、氢、氧、氮四种元素组成的 |
D.帕拉米韦中碳元素的质量分数为![]() |
A.地球上淡水资源丰富,可以说是取之不尽、用之不竭 |
B.保持水的化学性质的最小粒子是氢原子和氧原子 |
C.电解水的实验说明,水是由氢气和氧气组成的 |
D.我国部分地区水资源短缺,严重制约了当地经济发展、影响了人民生活质量 |
A.为了节约粮食,发霉的大米清洗后继续煮熟食用 |
B.塑料垃圾用燃烧的方法进行处理 |
C.人类需要的能量都是由化学反应提供的 |
D.发现燃气泄漏时,既不能开灯检查,也不能打开排气扇换气 |
5.选择题- (共20题)
In 1990, when I{#blank#}1{#/blank#}(be) nine years old, I wanted very much to find{#blank#}2{#/blank#}pen friend. I found Ashley's address in a magazine, and decided{#blank#}3{#/blank#}(write) to her.
I sent off my letter with a little hope. Very quickly, I received her letter.{#blank#}4{#/blank#}my surprise, Ashley was only one month {#blank#}5{#/blank#} (old) than me. I learned some new expressions from her. I {#blank#}6{#/blank#}(real) liked this new friend.
Letter after letter, year after year, Ashley and I continued to write to one another. A letter would be received and I'd write back right away. We would send each other birthday and Christmas {#blank#}7{#/blank#}(gift).
Eight years later, my parents decided it was time{#blank#}8{#/blank#}me to meet this friend. They drove me down to Mississippi for a few days. We{#blank#}9{#/blank#}(have) a fun time together. We did the things that teenage girls love to do.
Twenty-five years after the{#blank#}10{#/blank#}(one) letter, Ashley and I still have an amazing friendship. Although we don't write letters now, we communicate through mobile phones and the Internet.
In 1990, when I{#blank#}1{#/blank#}(be) nine years old, I wanted very much to find{#blank#}2{#/blank#}pen friend. I found Ashley's address in a magazine, and decided{#blank#}3{#/blank#}(write) to her.
I sent off my letter with a little hope. Very quickly, I received her letter.{#blank#}4{#/blank#}my surprise, Ashley was only one month {#blank#}5{#/blank#} (old) than me. I learned some new expressions from her. I {#blank#}6{#/blank#}(real) liked this new friend.
Letter after letter, year after year, Ashley and I continued to write to one another. A letter would be received and I'd write back right away. We would send each other birthday and Christmas {#blank#}7{#/blank#}(gift).
Eight years later, my parents decided it was time{#blank#}8{#/blank#}me to meet this friend. They drove me down to Mississippi for a few days. We{#blank#}9{#/blank#}(have) a fun time together. We did the things that teenage girls love to do.
Twenty-five years after the{#blank#}10{#/blank#}(one) letter, Ashley and I still have an amazing friendship. Although we don't write letters now, we communicate through mobile phones and the Internet.
went, made, customs, tell, friends, told, met, first, used, said, hands, German |
Friends, I'd like to{#blank#}1{#/blank#}you something important. Before you go to another country, it is a great help if you know the language and some of the {#blank#}2{#/blank#}of the country.
When people meet each other for the{#blank#}3{#/blank#}time in Britain, they say “How do you do?” and shake{#blank#}4{#/blank#}. Usually they do not shake hands when they just meet or say goodbye. But they shake hands after they haven't{#blank#}5{#/blank#}for a long time or when they will be away from each other for a long time.
Last year a group of German students{#blank#}6{#/blank#}to England for holiday. Their teacher{#blank#}7{#/blank#}them that the English people hardly shake hands. So when they met their English{#blank#}8{#/blank#}at the station, they kept their hands behind their backs. The English students had learned that the{#blank#}9{#/blank#}shake hands as often as possible, so they put their hands in front and got ready to shake hands with them. It {#blank#}10{#/blank#}both of them laugh.
姓名 | 白天 | 晚上 |
李乐 | 上课专心听讲,认真记笔记,喜欢回答老师的问题 | 花少量时间完成作业,早睡早起 |
韩冲 | 上课从来不记笔记,很少发言 | 花大量时间做作业,导致他经常熬夜,第二天打瞌睡 |
Last week I made a survey on how my two classmates study. Here are the results.
姓名 | 白天 | 晚上 |
李乐 | 上课专心听讲,认真记笔记,喜欢回答老师的问题 | 花少量时间完成作业,早睡早起 |
韩冲 | 上课从来不记笔记,很少发言 | 花大量时间做作业,导致他经常熬夜,第二天打瞌睡 |
Last week I made a survey on how my two classmates study. Here are the results.
6.填空题- (共2题)

(1)该牙膏中含有一种能防止龋齿的元素,这种元素是_____(填元素 符号)。
(2)单氟磷酸钠(Na2PO3F)中,F的化合价是_____价,则P的化合价为____________价。
(3)单氟磷酸钠(Na2PO3F)中,Na元素与O元素的质量比为_______________(相对原子质量:Na—23、O—16)。
从①H2O2、②CaCO3、③CH4、④NaCl中选择适当的物质的序号填空:
(1)可用作补钙剂的是_____________________。
(2)在实验室中可用来制取氧气的是_____________。
(3)属于天然气主要成分的是_______________。
7.实验题- (共2题)
(提出问题)
料液的主要成分(H2O除外)是什么?
(猜想与假设)
实验小组的同学通过充分讨论,作出了如下猜想:
①料液中一定含有NaOH、NaCl、Ca(OH)2
②料液中一定含有NaOH、NaCl、Na2CO3
(对猜想的解释)
(1)料液中一定没有CaO的原因是_____________________(用化学方程式表示)。
(2)料液中一定存在NaOH的原因是____________________(用化学方程式表示)。
(进行实验)
Ⅰ.取适量料液放入试管中,滴加2~3滴酚酞试液,料液显红色。
Ⅱ.取适量料液放入试管中,滴加少量Na2CO3溶液,料液中出现白色沉淀。
Ⅲ.取适量料液放入试管中,滴加稀盐酸直到过量,没有现象发生。
(实验结论)
(3)该料液中含有的物质除NaOH与NaCl外,还一定含有________(填化学式)。
(交流与拓展)
(4)松花皮蛋味道鲜美,但直接食用会稍有涩味。如果将松花皮蛋蘸上食醋食用,则轻微涩味会被去除,味道变得更为鲜美可口。请你说明食醋可以去除松花皮蛋涩味的原因__________________。
(5)现在有的皮蛋厂直接用烧碱(NaOH)代替生石灰和纯碱,但制得的皮蛋口感不如益阳产松花皮蛋。烧碱一定要密封保存,其理由是____________(选序号填空)。
|
某化学实验小组在进行粗盐中难溶性杂质的去除中,设计并完成了下列实验。
(查找资料)
NaCl的溶解度:
温度/℃ | 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 |
溶解度/g | 35.7 | 35.8 | 36.0 | 36.3 | 36.6 | 37.0 | 37.3 | 37.8 | 38.4 | 39.0 |
(设计并进行实验)
通过小组讨论,设计出了如下实验流程并依流程进行实验:




实验各步的操作示意图如下:

请回答下列问题:
(1)上述实验操作示意图中,有两处操作是错误的,它们是_________(填序号)。
(2)在实验过程中要多次使用玻璃棒,其中蒸发过程中用玻璃棒进行搅拌的目的是
_______________________________。
(3)工业上制备粗盐时,采用晒盐或煮盐的方法通过蒸发盐溶液中水分使之浓缩结
晶,而不采用降低溶液温度的方法来达到同一目的的理由是_________。
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【1】题量占比
简答题:(1道)
推断题:(1道)
计算题:(1道)
单选题:(15道)
选择题:(20道)
填空题:(2道)
实验题:(2道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:4
5星难题:0
6星难题:8
7星难题:0
8星难题:8
9星难题:1