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（10分）某实验小组用0．50 mol·L －1 NaOH溶液和0．50 mol·L －1 硫酸溶液进行中和热的测定。 Ⅰ．配制0．50 mol·L －1 NaOH溶液 （1）若实验中大约要使用245 mL NaOH溶液，至少需要称量NaOH固体________g。 （2）从下图中选择称量NaOH固体所需要的仪器(填字母)：__________。 名称 托盘天平(带砝码) 小烧杯 坩埚钳 玻璃棒 药匙 量筒 仪器 序号 a b c d e f Ⅱ．测定稀硫酸和稀氢氧化钠中和热的实验装置如下图所示。 （1）写出该反应的热化学方程式(中和热为57．3 kJ·mol －1 )：_________________________ ________________________________________________________________________。 （2）取50 mL NaOH溶液和30 mL硫酸溶液进行实验，实验数据如下表。 ①请填写下表中的空白： 温度 实验次数 起始温度t 1 /℃ 终止温度t 2 /℃ 温度差平均值 (t 2 －t 1 )/℃ H 2 SO 4 NaOH 平均值 1 26．2 26．0 26．1 30．1 2 27．0 27．4 27．2 31．2 3 25．9 25．9 25．9 29．8 4 26．4 26．2 26．3 30．4 ②近似认为0．50 mol·L －1 NaOH溶液和0．50 mol·L －1 硫酸溶液的密度都是1 g·cm －3 ，中和后生成溶液的比热容c＝4．18 J·g －1 ·℃ －1 。则中和热ΔH＝_______________________(取小数点后一位)。 ③上述实验数值结果与57．3 kJ·mol －1 有偏差，产生偏差的原因可能是(填字母)____________。 a．实验装置保温、隔热效果差 b．量取NaOH溶液的体积时仰视读数 c．分多次把NaOH溶液倒入硫酸的小烧杯中 d．用温度计测定NaOH溶液起始温度后直接测定H 2 SO 4 溶液的温度
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举一反三
【多选题】关于表面活性剂下列说法正确的是( )
A.
疏水基的支链化对去污性能有显著影响 , 一般随着支链化程度的提高，去污能力明显下降，但可以提高表面活性剂的润湿能力。
B.
洗涤剂中要求表面活性剂的亲油基和亲水基要保持相对平衡。
C.
一般来说，表面活性剂的碳链越长，洗后织物的手感越好。
D.
在洗涤剂配方中多采用阴离子表面活性剂和非离子表面活性剂。
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【单选题】He ’ s always had a for books. If he would work in a library, it would be a dream come true.
A.
pain
B.
dislike
C.
passion
D.
passionate
查看完整题目与答案
【多选题】下列关于表面活性剂的说法正确的是
A.
表面活性剂的分子量一般低于30
B.
表面活性剂具有双亲性分子
C.
亲水侧为非极性烃链
D.
亲油侧为非极性烃链
E.
亲水侧可以是硫酸及其盐
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【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
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【简答题】And not to say he would have imagined ( 9 ) Mount Kilimanjaro.
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【简答题】Mom was aware of the 18 I was having with accepting this change. She wrapped her arms around me, 19 me as tears trickled down my cheeks. At last she learned back and smiled at me."I know this is 20 fo...
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【多选题】税收法定原则的内容包括( )
A.
纳税人法定
B.
征税对象法定
C.
税率法定
D.
纳税期限法定
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【多选题】税收法定原则的内容包括( )。
A.
纳税期限法定
B.
税率法定
C.
纳税人法定
D.
征税对象法定
查看完整题目与答案
【单选题】A teenage girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
A.
a little
B.
a few
C.
much
D.
more
查看完整题目与答案
【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
查看完整题目与答案
相关题目：
【多选题】关于表面活性剂下列说法正确的是( )
A.
疏水基的支链化对去污性能有显著影响 , 一般随着支链化程度的提高，去污能力明显下降，但可以提高表面活性剂的润湿能力。
B.
洗涤剂中要求表面活性剂的亲油基和亲水基要保持相对平衡。
C.
一般来说，表面活性剂的碳链越长，洗后织物的手感越好。
D.
在洗涤剂配方中多采用阴离子表面活性剂和非离子表面活性剂。
查看完整题目与答案
【单选题】He ’ s always had a for books. If he would work in a library, it would be a dream come true.
A.
pain
B.
dislike
C.
passion
D.
passionate
查看完整题目与答案
【多选题】下列关于表面活性剂的说法正确的是
A.
表面活性剂的分子量一般低于30
B.
表面活性剂具有双亲性分子
C.
亲水侧为非极性烃链
D.
亲油侧为非极性烃链
E.
亲水侧可以是硫酸及其盐
查看完整题目与答案
【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
查看完整题目与答案
【简答题】And not to say he would have imagined ( 9 ) Mount Kilimanjaro.
查看完整题目与答案
【简答题】Mom was aware of the 18 I was having with accepting this change. She wrapped her arms around me, 19 me as tears trickled down my cheeks. At last she learned back and smiled at me."I know this is 20 fo...
查看完整题目与答案
【多选题】税收法定原则的内容包括( )
A.
纳税人法定
B.
征税对象法定
C.
税率法定
D.
纳税期限法定
查看完整题目与答案
【多选题】税收法定原则的内容包括( )。
A.
纳税期限法定
B.
税率法定
C.
纳税人法定
D.
征税对象法定
查看完整题目与答案
【单选题】A teenage girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
A.
a little
B.
a few
C.
much
D.
more
查看完整题目与答案
【简答题】A age girl couldn ’ t stand (忍受) her family rules, so she left home. She wanted to be a star and became famous. But she had a little education and 1 years later, she had to ask for food on the str...
查看完整题目与答案