1.计算题- (共1题)
2.单选题- (共9题)
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 |
其中可能引起雾霾天气的是
A.①②④ | B.②③④ | C.①③④ | D.①②③ |
A.由不同种元素组成的物质一定是混合物 |
B.某物质能与碱反应生成盐和水,则该物质一定是酸 |
C.向某固体中加入稀盐酸有气体产生,则该固体一定是较活泼金属 |
D.饱和溶液析出晶体后,溶质质量分数不一定减小 |
A.①②④ | B.②③④ | C.①③④ | D.①②③ |
3.选择题- (共3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
4.填空题- (共4题)
(1)化学用语是学习和研究化学的重要工具,请用适当的化学符号填空:
①2个氢原子 ;②3个铵根离子 ;
③地壳中含量最多的金属元素 ;④氯化钠中的阴离子 ;
(2)化学与人类生活息息相关。请回答下列问题。
①常用于改良酸性土壤的碱 ;
②铁元素是人体必需的一种微量元素。食用“加铁酱油”可预防 ;
③碳酸钠水溶液能导电的原因是 。
(1) 含有较多可溶性钙、镁化合物的水叫做 (填“软水”或“硬水”);
(2) 下列净化水的单一操作中,相对净化程度较高的是 (填字母);
A.静置沉淀 B.吸附沉淀 C. 蒸馏
(3) 水在通电的条件下可以分解,写出该反应的化学方程式 ;
(4) 甲和乙两种固体物质的溶解度曲线如右图所示,回答下列问题:

①在 ℃时,甲和乙两种物质的溶解度相等;
②将t1℃时等质量的甲和乙两种物质的饱和溶液分别降温到0℃,析出固体质量较少的是 (填“甲”或“乙”);
③t2℃时,将60 g甲物质放入100 g 水中,充分搅拌,所得溶液的溶质质量分数w(甲)与同温下乙物质的饱和溶液的溶质质量分数w(乙)大小关系为 (填字母)
A.w(甲)< w(乙) B.w(甲)> w(乙)
C.w(甲)=" w" (乙) D.无法确定

(1) A的化学式是 ;
(2) B与I之间反应的化学方程式 ,属于 反应(填基本反应类型);
(3) G与H反应的化学方程式 。

(1)图中标号仪器的名称:① ,② ;
(2)用氯酸钾和二氧化锰制氧气,选用发生装置 (填字母A、B、C、D),该反应化学方程式是 。实验中熄灭酒精灯的操作是 ;
(3)关闭B装置中的止水夹后,从长颈漏斗向锥形瓶中注入一定量的水,静止后如图所示,则B装置 (填“漏气”、“不漏气”或“无法确定”);
(4)常温下用块状固体和液体反应制气体时,改用C装置(多孔隔板用来放块状固体)代替B装置的优点是 (填序号);
A.可以随时加液 | B.可以控制反应速率 | C.可以控制反应发生与停止 |
②实验室若要配制980g溶质质量分数为10%的稀硫酸,需要量取溶质质量分数为98%的浓硫酸(密度为1.84 g/cm3) mL(计算结果保留一位小数)。若量取浓硫酸时,仰视读数则所配溶液的溶质质量分数 (填“偏大”、“偏小”或“不变”)。
5.实验题- (共1题)
(1)甲组同学的实验如下图所示:在烧杯中加入5g氢氧化钠溶液,滴入几滴酚酞溶液,用滴管慢慢滴入1%的稀盐酸,并不断搅拌,至溶液颜色恰好变为无色为止。

请回答:
①酚酞溶液的作用是 ;
②滴加稀盐酸时,用玻璃棒不断搅拌的目的是 ;
③当溶液颜色恰好变为无色时,共用去了稀盐酸73g,则甲组这瓶氢氧化钠溶液中溶质的质量分数为 ;
(2)乙组同学的设想是:在烧杯中加入一定量的氢氧化钠溶液,用滴管慢慢滴入1%的稀盐
酸,并不断搅拌,通过用pH试纸多次测定溶液pH的办法,达到实验目的。
①下列使用pH试纸的方法正确的是 (填字母);
A.将pH试纸直接插入待测液中 |
B.将pH试纸放在干净的白瓷板上,用玻璃棒蘸取待测液滴在pH试纸上 |
C.将pH试纸润湿后放在玻璃片上,用玻璃棒蘸取待测液滴在pH试纸上 |

(3)丙组同学在滴加稀盐酸一段时间后,发现溶液中有少量气泡产生。这一“异常现象”激起了他们的探究欲望,通过实验证明:该组所用氢氧化钠溶液已经变质。请用化学方程式表示其变质原因 ;若要除去该溶液中的杂质,请简要写出你的实验方案: 。
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【1】题量占比
计算题:(1道)
单选题:(9道)
选择题:(3道)
填空题:(4道)
实验题:(1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:5
5星难题:0
6星难题:6
7星难题:0
8星难题:2
9星难题:2