1.科学探究题- (共1题)
(1)测定氯水的酸性：取少量，向其中滴加____(填字母)，一开始应观察到滴加的指示剂在氯水中显____色。
a．无色酚酞试液 b．紫色石蕊试液
(2)氯水具有漂白性，请你参与“氯水使品红试纸褪色”的研究。
【提出问题】氯水中的什么成分使品红试纸褪色？
【猜想】
猜想1：氯水中的水使品红试纸褪色。
猜想2：氯水中的Cl2使品红试纸褪色。
猜想3：氯水中的HCl使品红试纸褪色。
【实验探究】
| 实验操作 | 实验现象 | 结论 |
| ①用水润湿品红试纸，观察 | _____________ | 猜想1不成立 |
| ②把品红试纸放入干燥的氯气中，观察 | 试纸不褪色 | 猜想2不成立 |
| ③________________________，观察 | 试纸不褪色 | 猜想3不成立 |
【结论】通过探究，找到氯水中使品红试纸褪色的原因。
【思考】实验(1)向氯水中滴加几滴所选指示剂后，最终观察到的现象是___________。
猜想4：氯水中的____________(填化学式)使品红试纸褪色。
2.单选题- (共8题)
| A．打开盛有浓硫酸的试剂瓶塞，瓶口出现白雾 |
| B．浓硫酸不慎沾到皮肤上，立即用大量的水冲洗，然后再涂上3%﹣5%的碳酸氢钠溶液 |
| C．实验室用稀硫酸和石灰石制取二氧化碳 |
| D．把铜片放入稀硫酸中，产生大量气泡 |
| A．“洁厕灵”可用于金属表面除锈 |
| B．“洁厕灵”可用于清洁大理石地面 |
| C．“84消毒液”主要成分NaClO中Cl元素的化合价呈－1价 |
| D．“洁厕灵”与“84消毒液”混合后发生置换反应 |
| A．浓硫酸的密度大于水的密度 |
| B．浓硫酸与水混合时溶液温度迅速升高 |
| C．浓硫酸具有很强的吸水性而被装入干燥器中使用 |
| D．浓硫酸腐蚀衣物和皮肤是物理变化 |
3.选择题- (共2题)
Perhaps you've seen the English letters “WC” in your city. They show public toilets. But do you know it is far from elegant (优雅的) English? In fact, foreigners from English-speaking countries rarely use the letters.
Workers in our city are changing “WC” signs all over the city. The government is spending much money changing all the bad English on signs and restaurant menus. Many other places in China are following our steps.
“WC, or water closet, is old-fashioned English. It sounds dirty to me,” says Charlie Shifflet, a young man from the US. The old sign will become “Gents/Men” and “Ladies/Women”.
“I see lots of poor English in everyday life, and not only on signs,” he says. “I know what they mean. But they are Chinglish, not real English. For example, when someone says to me 'My hometown is Henan Province', I know he should say: 'My hometown is in Henan Province'. 'Hometown' is a smaller place in a province.” The common mistakes he picked up include “Not Entry”, which should be “No Entry”, “Direction of Airport” should be changed to “To the Airport”. And it is “room rate”, not “room price”. And remember to “Keep off the grass”, rather than “Care of the green”.
Perhaps you've seen the English letters “WC” in your city. They show public toilets. But do you know it is far from elegant (优雅的) English? In fact, foreigners from English-speaking countries rarely use the letters.
Workers in our city are changing “WC” signs all over the city. The government is spending much money changing all the bad English on signs and restaurant menus. Many other places in China are following our steps.
“WC, or water closet, is old-fashioned English. It sounds dirty to me,” says Charlie Shifflet, a young man from the US. The old sign will become “Gents/Men” and “Ladies/Women”.
“I see lots of poor English in everyday life, and not only on signs,” he says. “I know what they mean. But they are Chinglish, not real English. For example, when someone says to me 'My hometown is Henan Province', I know he should say: 'My hometown is in Henan Province'. 'Hometown' is a smaller place in a province.” The common mistakes he picked up include “Not Entry”, which should be “No Entry”, “Direction of Airport” should be changed to “To the Airport”. And it is “room rate”, not “room price”. And remember to “Keep off the grass”, rather than “Care of the green”.
4.填空题- (共2题)
(1)经计算，所需水的质量为___g；所需98%的浓硫酸的体积为____mL。
(2)量取上述体积的浓硫酸所选用的仪器为____。(填选项)
| A．10 mL量筒 | B．100 mL烧杯 | C．100 mL量筒 | D．胶头滴管 |
(4)如果不慎将浓硫酸沾到皮肤上，应立即__________，然后涂上3%的小苏打溶液。
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【1】题量占比
科学探究题:(1道)
单选题:(8道)
选择题:(2道)
填空题:(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：0
5星难题：0
6星难题：5
7星难题：0
8星难题：4
9星难题：2