1.计算题- (共1题)
| 加热时间 | t1 | t2 | t3 | t4 |
| 剩余固体质量/g | 4.24 | 4.16 | 4.08 | 4.08 |
试计算：
（1）完全反应后产生的氧气的总质量为_______。
（2）样品中氯酸钾的纯度是多少_______？
2.单选题- (共6题)
| A．x的值是2 |
| B．乙一定是化合物 |
| C．丙一定是该反应的催化剂 |
| D．反应中乙和丁的质量比是14：15 |
A. 水与冰的共存物是纯净物，是因为它们由同种分子构成
B. 水结成冰，是因为温度降低，分子停止运动
C. 水通电分解生成氢气和氧气，是因为水中含有氢分子和氧分子
D. 水与酒精混合液的体积小于混合前二者体积之和，是因为混合后分子体积变小
| 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．振荡试管内的液体时，用手紧握试管，上下晃动 |
| B．过滤时，为加快过滤的速度，可用玻璃棒搅动漏斗里的液体 |
| C．用酒精灯加热试管里的液体时，试管外壁应该干燥 |
| D．为了节约药品，可将实验用剩的药品倒回原试剂瓶 |
3.选择题- (共2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1题)
请回答下列问题．
（1）检验自来水是硬水还是软水的方法是_____．
（2）①的主要作用是_____，③的作用是_____．
（3）②中反渗透膜是直饮水机的核心技术，反渗透膜上的孔径只有0.0001～0.001微米，相当于一根头发丝的百万分之一，它的工作原理如图2所示．反渗透膜_____（填“能”或“不能”）将硬水软化，此操作的原理与净水方法中的_____操作相似．
（4）节约用水、防止水污染应成为我们的自觉行为．下列叙述中不正确的是_____．（填序号）
| A．减少化肥、农药使用 | B．工业用水处理后重复利用 |
| C．生活中充分利用每一滴水 | D．生活污水不需处理可直接排放． |
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【1】题量占比
计算题:(1道)
单选题:(6道)
选择题:(2道)
填空题:(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：0
5星难题：0
6星难题：2
7星难题：0
8星难题：5
9星难题：1