1.科学探究题- (共1题)
提出了猜想:a、气体产物可能是二氧化碳;
b、气体产物可能是一氧化碳;
c、气体产物可能是二氧化碳和一氧化碳。
(1)如果猜想a成立,写出气体产物通入澄清石灰水反应的化学方程式 。
(2)如果猜想b成立,写出木炭还原氧化铜反应的化学方程式 。
(3)同学们设计了如下图所示装置,通过实验探究气体产物的成分。(NaOH溶液能吸收CO2)

实验过程中观察到A、E装置中的澄清石灰水均变浑浊,C装置中的澄清石灰水不变浑浊,由此可得出该气体产物的成分为 。

(4)有同学提出,从简化装置、节约实验药品的角度出发,上图装置可进行改进,去掉A、B、C装置,用如图所示的装置同样可以探究出该气体产物的成分。请你写出其实验操作过程(写出操作步骤以及现象和结论)
2.单选题- (共9题)
①元素的种类; ②原子的种类;
③原子的个数; ④原子的质量;
⑤物质的总质量; ⑥分子的种类;
⑦分子的数目; ⑧物质的种类
A.①②③④⑤ | B.①②⑥⑦⑧ | C.①②③⑥⑧ | D.④⑤⑥⑦⑧ |
A. 此合成过程的反应类型是化合反应,Y的化合价为+2
B. 此合成过程的反应类型是化合反应,Y的化合价为+3
C. 此合成过程的反应类型不是化合反应,Y的化合价为+2
D. 此合成过程的反应类型不是化合反应,Y的化合价为+3
A.8.8 g | B.9.6 g | C.6.8 g | D.4.4 g |
A.Ba2O | B.BaO2 | C.Ba2O2 | D.BaO3 |
A.硫化丙烯的相对分子质量为74 |
B.硫化丙烯中硫元素的质量分数最大 |
C.硫化丙烯分子中碳、氢、硫元素质量比为3:6:1 |
D.硫化丙烯由3个碳原子、6个氢原子和1个硫原子构成 |
A.晚上煤气泄漏,立即开窗通风 |
B.点燃氢气前,应先检验氢气的纯度 |
C.用煤炉取暖,在煤炉上放一壶水以防止煤气中毒 |
D.进入久未开启的菜窑,先用蜡烛做灯火实验 |
A.用旧报纸制铅笔杆 | B.参加“地球熄灯一小时”活动 |
C.开发回收利用二氧化碳的新技术 | D.深秋时节焚烧落叶 |
3.选择题- (共4题)
Wang Fei,a Chinese student,and Mary,an American student studying Chinese in China,were in a supermarket.They saw a young man walking down the stairs.In his hurry,he missed the last two steps and fell onto the ground.He tried to stand up while people around him laughed.Luckily,he seemed to be OK.
Mary found Wang Fei smiling a little and was not happy about it. “Tell me, Fei, how could people laugh when someone fell like that? Why didn't they go up and ask him if he was hurt?”
Wang Fei said, “Because they knew he wasn't hurt too much.”
“But I still don't understand.A fall is a fall.In my culture, people would never laugh!”
This is an example.The Chinese and the westerner will think and act differently when seeing such a thing.Chinese people are used to laughing or smiling.Very often the person who is in embarrassing(困窘的)situation would also laugh or smile to get out of it.However,if someone gets hurt seriously,it will not be a laughing matter any more.People will help him or her instead.
But,in that case,a westerner will rush over and help the person get up.If a westerner falls,he or she,like a Chinese person,may try to make a joke if he or she is not hurt.If two close friends are walking together,and one falls but clearly isn't hurt,a common joke is to say “Have a nice trip”.
So different people have different habits and different countries have different cultures
Wang Fei,a Chinese student,and Mary,an American student studying Chinese in China,were in a supermarket.They saw a young man walking down the stairs.In his hurry,he missed the last two steps and fell onto the ground.He tried to stand up while people around him laughed.Luckily,he seemed to be OK.
Mary found Wang Fei smiling a little and was not happy about it. “Tell me, Fei, how could people laugh when someone fell like that? Why didn't they go up and ask him if he was hurt?”
Wang Fei said, “Because they knew he wasn't hurt too much.”
“But I still don't understand.A fall is a fall.In my culture, people would never laugh!”
This is an example.The Chinese and the westerner will think and act differently when seeing such a thing.Chinese people are used to laughing or smiling.Very often the person who is in embarrassing(困窘的)situation would also laugh or smile to get out of it.However,if someone gets hurt seriously,it will not be a laughing matter any more.People will help him or her instead.
But,in that case,a westerner will rush over and help the person get up.If a westerner falls,he or she,like a Chinese person,may try to make a joke if he or she is not hurt.If two close friends are walking together,and one falls but clearly isn't hurt,a common joke is to say “Have a nice trip”.
So different people have different habits and different countries have different cultures
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4.填空题- (共8题)
(1)乙炔属于 (填序号);①单质 ②化合物
(2)乙炔(C2H2)分子中氢原子与碳原子的个数比为 ;
(3)已知乙炔(C2H2)在氧气中燃烧,产物为二氧化碳和水.该反应的化学方程式式为 ;

请回答:
钙元素属于 (填“金属”或“非金属”)元素,相对原子质量为 ,其元素的原子在化学变化中容易 (填“得到”或“失去”)电子形成离子,离子符号为
(1)能用于灭火的是___________;
(2)医疗上用于急救病人的是__________;
(3)有毒的气体是_____________;
(4)21世纪最理想的燃料是___________.
① ;② 基本反应类型是 .
(2)“84”消毒液可用于灾区防疫,其主要成分是次氯酸钠(NaClO),制取它的化学方程式为2NaOH+X═NaClO+NaCl+H2O,则X的化学式为 .求出NaClO中氯元素化合价并在该化学式中表示出来 .
(3)燃气安全是家庭生活中的头等大事.为了防止燃气泄漏,常在燃气中加入少量有特殊气味的乙硫醇(C2H5SH).一旦燃气泄漏即可闻到气味,从微观的角度分析其原因是 ;乙硫醇充分燃烧时生成二氧化碳、二氧化硫和水,乙硫醇燃烧的化学方程式为 。
(1)天然水中含有许多杂质,实验室常用过滤的方法除去水中悬浮的杂质,过滤用到的仪器除带铁圈的铁架台、烧杯外,还需要的玻璃仪器有 。
(2)实验室里,常用 检验硬水和软水。生活中,常见降低水的硬度的方法是 。若水中含有少量色素,可用 将其除去(填一种物质即可)。
(3)能得到纯净水的操作是 。

回答下列问题:
⑴甲装置中a仪器的名称是 。使用a仪器有很多注意事项,请任意写出一点来 。
⑵选用图己装置收集气体时,当看到 ,说明已经收集满。
⑶①小明在实验操作考查中抽到的考题是“在实验室制取二氧化碳,用排空气法收集满一瓶二氧化碳,放置在实验桌上。”为完成实验,他应选用上列装置中的 (填装置序号)。检验集气瓶是否收集满二氧化碳的方法是 。
②经过学习小明对气体制备有一些心得,如:选择制取气体的反应装置时应考虑的两个因素是 、 。
⑷现要制取一瓶二氧化氮气体,小明收集到如下资料。
①制取NO2的反应原理:Cu+4HNO3(浓)=Cu(NO3)2+2NO2↑+2H2O
②通常状况下,NO2是一种密度比空气大有毒气体,能与水发生反应。
③NO2能被氢氧化钠溶液吸收。
结合已掌握的知识,选择以上装置制备并收集一瓶二氧化氮气体,从左到右的连接顺序为 (填接口序号)。
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【1】题量占比
科学探究题:(1道)
单选题:(9道)
选择题:(4道)
填空题:(8道)
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【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:0
5星难题:0
6星难题:7
7星难题:0
8星难题:11
9星难题:0