1.单选题- (共17题)
A.Ca(HCO3)2→CaCO3↓+ CO2↑+ H2O | B.2Na + Cl2→2NaCl |
C.2Mg + CO2→2MgO + C | D.AgNO3 + NaCl→AgCl↓ +NaNO3 |
选项 | A | B | C | D |
滤液中的溶质 | NaOH.Ca(OH)2 | NaOH | NaOH.Na2CO3 | Na2CO3 |
滤渣 | CaCO3.Ca(OH)2 | Ca(OH)2 | CaCO3.Ca(OH)2 | CaCO3 |
A. A
B. B
C. C
D. D
选项 | 溶液 | 杂质 | 试剂 |
A | NaNO3 | Na2CO3 | 适量BaCl2溶液 |
B | CaCl2 | 稀盐酸 | 足量CaCO3固体 |
C | ZnSO4 | CuSO4 | 足量铜粉 |
D | Fe2(SO4)3 | Na2SO4 | 足量NaOH溶液 |
A.A | B.B | C.C | D.D |
选项 | A | B | C | D | ![]() |
现象放大图 | ![]() | ![]() | ![]() | ![]() |
A.A | B.B | C.C | D.D |
2.选择题- (共8题)
B
Now Jack and Jim are my best friends. One day I go to their home. They have a new bedroom. Their room is very nice. A picture is on the wall. You can see their father and mother in it. A big desk is near the bed. Two chairs are behind the desk. Their books and pens are on the desk. There is a new computer on the desk, too. Their school bags are on the wall behind the door.
Hello, my name is Betty and I'm in Class Six. I'm twelve years old. I'm American. I'm from New York. Mike is in my class and he is my good friend.
Hi, I'm Mike. I'm from London. I'm in Class Six, too. Wang Tao is my friend. He is in my class.
Hi, my name is Wang Tao. I'm Chinese. I'm from Hangzhou. I'm in Class Six with Betty and Mike. They are my good friends.
Name | Age | City | Class | Nationality |
Betty | {#blank#}1{#/blank#} | New York | Six | {#blank#}2{#/blank#} |
{#blank#}3{#/blank#} | / | {#blank#}4{#/blank#} | Six | English |
Wang Tao | / | Hangzhou | {#blank#}5{#/blank#} | Chinese |
Hello, my name is Betty and I'm in Class Six. I'm twelve years old. I'm American. I'm from New York. Mike is in my class and he is my good friend.
Hi, I'm Mike. I'm from London. I'm in Class Six, too. Wang Tao is my friend. He is in my class.
Hi, my name is Wang Tao. I'm Chinese. I'm from Hangzhou. I'm in Class Six with Betty and Mike. They are my good friends.
Name | Age | City | Class | Nationality |
Betty | {#blank#}1{#/blank#} | New York | Six | {#blank#}2{#/blank#} |
{#blank#}3{#/blank#} | / | {#blank#}4{#/blank#} | Six | English |
Wang Tao | / | Hangzhou | {#blank#}5{#/blank#} | Chinese |
3.填空题- (共1题)

(1)晒盐是海水在常温下蒸发得到氯化钠的过程,实验室用氯化钠溶液模拟该过程:
已知B溶液恰好是氯化钠的饱和溶液,与B溶液中溶质质量相等的溶液是 (填编号);与B溶液中溶质质量分数相等的溶液是 (填编号).
(2)氯化钠、硝酸钾、硒酸镉的溶解度曲线如图2所示.据图回答:
溶解度变化受温度影响最大的是 .t℃时,将25g硒酸镉加入 g水中,完全溶解后,恰好得到饱和溶液.要进一步提高该溶液的溶质质量分数,可进行的操作是 .
(3)硝酸钾溶液中含有少量氯化钠杂质,提纯的方法是 .
4.实验题- (共1题)
①制备氧化铜并检验产物,装置如下图所示(省略夹持仪器):

步骤一:连接A和B,打开活塞,通入空气。
步骤二:关闭活塞,连上C和D,开始加热。
步骤三:在加热过程中,记录在B中固体质量变化如下表,在t3时停止加热。
加热时间(min) | 0 | t1 | t2 | t3 |
B中固体质量(g) | 6.66 | 5.20 | 4.80 | 4.80 |
B中发生反应的化学方程式为:Cu2(OH)2CO3→ CuO + H2O + CO2↑
请在中填入配平后的系数(10)。
C中试剂是(11)。A的作用是吸收空气中的(12),防止对产物检验造成干扰。选择t3时停止加热的理由是(13)。
一定量碳粉还原①中制得的氧化铜并检验产物,装置如下图所示:

实验过程中,观察到F中溶液变浑浊,E中的现象是(14)。
反应完全后,若仅撤走酒精喷灯停止加热,可能导致的后果是(15)。
分析:若①中省略步骤三,对②中反应产物判断可能产生的影响及其原因。
(16)
-
【1】题量占比
单选题:(17道)
选择题:(8道)
填空题:(1道)
实验题:(1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:2
5星难题:0
6星难题:7
7星难题:0
8星难题:6
9星难题:4