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【简答题】
某兴趣小组在学习碱的化学性质时，进行了如图所示的实验。 (1) 在甲实验过程中，插入一支温度计来测量溶液的温度时，随着稀盐酸的不断滴入， 溶液的温度逐渐升高，你认为溶液温度升高的原因是 ； 写出该反应的化学方程式 。 (2)乙实验中滴加氢氧化钠溶液后，可观察到的现象是 ； 反应的化学方程式 。 (3)实验结束后，同学们将甲、个实验的废液倒入同一个干净的废液缸中，看到有 气泡出现，最终废液呈红色，由此产生疑问。 【提出问题】废液中含有哪些物质? 【交流讨论】①一定含有的物质：指示剂、 。 ②还含有能使废液呈碱性的物质。能使废液呈碱性的物质是什么?同学们有如下猜想。 小兰认为：只有碳酸钠（提示：碳酸钠水溶液PH﹥7）；认为：只有氢氧化钠。 你认为还可能是 。 【实验设计】小斌想用氯化钙溶液来验证小兰、和你的猜想。查阅资料获悉氯化钙溶液呈中性，并设计如下实验。请你将小斌的实验设计补充完整。 实验内容 预计现象 预计结论 取少量废液缸中上 层清液于试管中， 加入过量氯化钙 溶液，静置。 ①没有白色沉淀，溶液呈红色。 的猜想正确。 ②有白色沉淀，溶液由红色变 为无色 的猜想正确。 ③ 你的猜想正确。 （4）在甲实验中，如果消耗质量分数为7.3%的稀盐酸20.0g时，此时溶液的颜色恰好 由红色变为无色，试计算氢氧化钠溶液中溶质的质量分数。（提示：氢氧化钠溶液的密度为1g/ml）
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【简答题】U3_1_1b.wmv 1)I like playing music and going to 1)___in my free time. This weekend I'm going to 2)___In North London to see my friend's 3)___What do you like doing In your free time
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【简答题】U2-V1.mp4 Announcement: Welcome to Air Canada non-stop service ____1________. Our flying time today is estimated _______2____________. Please make sure your seat belt is fastened and that your chair...
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【多选题】客服人员的心理素质要求主要包括( )
A.
自信心
B.
挫折承受力
C.
积极心态
D.
情绪控制和管理
查看完整题目与答案
【单选题】2008年中国环境状况公报中指出:影响我国城市空气质量的主要污染物仍是颗粒物,50%的城市颗粒物浓度超过二级标准。这里所说的“标准”指的是( )
A.
环境质量标准
B.
污染物排放标准
C.
环境基础标准
D.
样品标准和方法标准
查看完整题目与答案
【单选题】下列哪些药物具有重氮化反应( )
A.
酰水杨酸
B.
氨基水杨酸钠
C.
甲酸
D.
尿酸
查看完整题目与答案
【单选题】Text 2 Imagine, if you will, the average games player. What do you see?
A.
guy who never grew up? Or a nervous 18 -year-old pushing buttons on his controller, lost and alone in a violent onscreen world? Sorry, you lose. The average gamer is starting to look pretty much like the average person .For the first time, according to a U. S. poll commissioned by AOL Games, roughly half of those surveyed, ages 12 t0 55, are tapping away at some kind of electronic game-whether on a PC, a cell phone or another handheld device-for an average of three hours every week. The games people play say a lot about who they are. Machines like the Xbox and PlayStation 2 are largely the territory of twenty-something men, who prefer to picture themselves as sports stars and racing drivers. Men 50 and older prefer military games. Teenage girls are much more likely than boys to play games on their phone, while older women make up the majority of people playing card games such as Hearts online. Is it a good thing, all this time spent on games? Or is it as harmful as television, pulling people ever further from reality? The AOL survey suggests some players are in denial about the ex- tent of their habit. One in 10 gamers finds it impossible to resist games; 1 in 4 admits to losing a night's sleep to play games; and another quarter has been too absorbed to have meals. But don' t think we' re all heading into a world with everyone plugged into, if not totally controlled by, his own game. Quite the contrary: gamers appear to be more engaged with reality than other kinds of couch potatoes. According to a comprehensive survey by the Entertainment Software Association ( ESA-whose members, of course, want you to think video games are healthy), gamers spend an average of 23 hours a week volunteering and going to church, concerts, museums and other cultural events. More enthusiastic gamers who play 11 hours a week or more spend even more time out in the cultural world(34 hours). 51. The AOL survey finds that electronic games _________ . [A] do not present a violent onscreen world [
B.
] no longer keep gamers from growing up [C] are no longer exclusive to young people [D] are not as popular with teenagers as before
查看完整题目与答案
【单选题】关于刑法上因果关系的判断，下列哪一选项是正确的( )
A.
甲为抢劫而殴打章某，章某逃跑，甲随后追赶。章某在逃跑时钱包不慎从身上掉下，甲拾得钱包后离开。甲的暴力行为和取得财物之间存在因果关系
B.
乙基于杀害的意思用刀砍程某，见程某受伤后十分痛苦，便将其送到医院，但医生的治疗存在重大失误，导致程某死亡。乙的行为和程某的死亡之间没有因果关系
C.
丙经过铁路道口时，遇见正在值班的熟人项某，便与其聊天，导致项某未及时放下栏杆，火车通过时将黄某轧死。丙的行为与黄某的死亡之间存在因果关系
D.
了为杀害李某而打其头部，使其受致命伤，2小时之后必死无疑。在李某哀求下，丁开车送其去医院。20分钟后，高某驾驶卡车超速行驶，撞向了的汽车致李某当场死亡。丁的行为和李某的死亡之间存在因果关系
查看完整题目与答案
【单选题】关于了卡因,下列哪项是对的( )
A.
是一种强效长时间作用的局麻药
B.
常用于局部浸润麻醉
C.
用于神经阻滞的浓度为0.5%
D.
用于神经阻滞麻醉,成人一次限量为40mg
E.
以上都不对
查看完整题目与答案
【单选题】按照冯忠良教授的观点,属于学习的联结-认知理论的是下列哪一个理论?( )
A.
布鲁纳的认知发现说
B.
奥苏泊尔的有意义接受说
C.
格式塔学派的完形-顿悟说
D.
托尔曼的认知-目的说
查看完整题目与答案
【单选题】2008年中国环境状况公报中指出,影响我国城市空气质量的主要污染物仍是颗粒物,50%的城市颗粒物浓度超过二级标准。这里所说的“标准”是指( )。
A.
环境质量标准
B.
污染物排放标准
C.
环境基础标准
D.
样品标准和方法标准
查看完整题目与答案
相关题目：
【简答题】U3_1_1b.wmv 1)I like playing music and going to 1)___in my free time. This weekend I'm going to 2)___In North London to see my friend's 3)___What do you like doing In your free time
查看完整题目与答案
【简答题】U2-V1.mp4 Announcement: Welcome to Air Canada non-stop service ____1________. Our flying time today is estimated _______2____________. Please make sure your seat belt is fastened and that your chair...
查看完整题目与答案
【多选题】客服人员的心理素质要求主要包括( )
A.
自信心
B.
挫折承受力
C.
积极心态
D.
情绪控制和管理
查看完整题目与答案
【单选题】2008年中国环境状况公报中指出:影响我国城市空气质量的主要污染物仍是颗粒物,50%的城市颗粒物浓度超过二级标准。这里所说的“标准”指的是( )
A.
环境质量标准
B.
污染物排放标准
C.
环境基础标准
D.
样品标准和方法标准
查看完整题目与答案
【单选题】下列哪些药物具有重氮化反应( )
A.
酰水杨酸
B.
氨基水杨酸钠
C.
甲酸
D.
尿酸
查看完整题目与答案
【单选题】Text 2 Imagine, if you will, the average games player. What do you see?
A.
guy who never grew up? Or a nervous 18 -year-old pushing buttons on his controller, lost and alone in a violent onscreen world? Sorry, you lose. The average gamer is starting to look pretty much like the average person .For the first time, according to a U. S. poll commissioned by AOL Games, roughly half of those surveyed, ages 12 t0 55, are tapping away at some kind of electronic game-whether on a PC, a cell phone or another handheld device-for an average of three hours every week. The games people play say a lot about who they are. Machines like the Xbox and PlayStation 2 are largely the territory of twenty-something men, who prefer to picture themselves as sports stars and racing drivers. Men 50 and older prefer military games. Teenage girls are much more likely than boys to play games on their phone, while older women make up the majority of people playing card games such as Hearts online. Is it a good thing, all this time spent on games? Or is it as harmful as television, pulling people ever further from reality? The AOL survey suggests some players are in denial about the ex- tent of their habit. One in 10 gamers finds it impossible to resist games; 1 in 4 admits to losing a night's sleep to play games; and another quarter has been too absorbed to have meals. But don' t think we' re all heading into a world with everyone plugged into, if not totally controlled by, his own game. Quite the contrary: gamers appear to be more engaged with reality than other kinds of couch potatoes. According to a comprehensive survey by the Entertainment Software Association ( ESA-whose members, of course, want you to think video games are healthy), gamers spend an average of 23 hours a week volunteering and going to church, concerts, museums and other cultural events. More enthusiastic gamers who play 11 hours a week or more spend even more time out in the cultural world(34 hours). 51. The AOL survey finds that electronic games _________ . [A] do not present a violent onscreen world [
B.
] no longer keep gamers from growing up [C] are no longer exclusive to young people [D] are not as popular with teenagers as before
查看完整题目与答案
【单选题】关于刑法上因果关系的判断，下列哪一选项是正确的( )
A.
甲为抢劫而殴打章某，章某逃跑，甲随后追赶。章某在逃跑时钱包不慎从身上掉下，甲拾得钱包后离开。甲的暴力行为和取得财物之间存在因果关系
B.
乙基于杀害的意思用刀砍程某，见程某受伤后十分痛苦，便将其送到医院，但医生的治疗存在重大失误，导致程某死亡。乙的行为和程某的死亡之间没有因果关系
C.
丙经过铁路道口时，遇见正在值班的熟人项某，便与其聊天，导致项某未及时放下栏杆，火车通过时将黄某轧死。丙的行为与黄某的死亡之间存在因果关系
D.
了为杀害李某而打其头部，使其受致命伤，2小时之后必死无疑。在李某哀求下，丁开车送其去医院。20分钟后，高某驾驶卡车超速行驶，撞向了的汽车致李某当场死亡。丁的行为和李某的死亡之间存在因果关系
查看完整题目与答案
【单选题】关于了卡因,下列哪项是对的( )
A.
是一种强效长时间作用的局麻药
B.
常用于局部浸润麻醉
C.
用于神经阻滞的浓度为0.5%
D.
用于神经阻滞麻醉,成人一次限量为40mg
E.
以上都不对
查看完整题目与答案
【单选题】按照冯忠良教授的观点,属于学习的联结-认知理论的是下列哪一个理论?( )
A.
布鲁纳的认知发现说
B.
奥苏泊尔的有意义接受说
C.
格式塔学派的完形-顿悟说
D.
托尔曼的认知-目的说
查看完整题目与答案
【单选题】2008年中国环境状况公报中指出,影响我国城市空气质量的主要污染物仍是颗粒物,50%的城市颗粒物浓度超过二级标准。这里所说的“标准”是指( )。
A.
环境质量标准
B.
污染物排放标准
C.
环境基础标准
D.
样品标准和方法标准
查看完整题目与答案
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