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【简答题】
某化学兴趣小组的同学在学习了纯碱（Na 2 CO 3 ）的性质后，联想到家中蒸制馒头时常用的物质小苏打（NaHCO 3 ），于是采用市售的小苏打样品进行了如下实验探究碳酸氢钠的化学性质 （1）①取样品溶于适量的水中，测得溶液的PH大于7。 ②向小苏打样品中滴加盐酸，有大量气泡产生，经检验该气体是二氧化碳。该反应的化学方程为 。 ③向小苏打的溶液中加入澄清石灰水，生成了白色沉淀。 （2）同学们通过查阅资料，在老师的指导下采用了下图所示装置对小苏打和纯碱做了对比实验。实验中小试管内沾有无水硫酸铜粉末的棉花球变成蓝色，a烧杯中石灰水无明显现象，b烧杯中石灰水了现白色浑浊。试回答： ① 在实验结束时，操作上要注意的问题是： 。 ② 由实验（2）可以得出的结论是 。 请归纳出小苏打的化学性质（至少三点） _________________________ 。
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【单选题】公式 ∆ H=Q p 适用于下列过程中的( )
A.
理想气体从 1013.25kPa反抗恒定外压101.325kPa膨胀
B.
273K，101.325kPa下冰融化成水
C.
298K，101.325kPa下电解CuSO 4 水溶液
D.
气体从状态 I 等温可逆变化到状态 II
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【简答题】American schoolkids attend school for fewer days than children in other educationally advanced countries , a situation President Obama said Monday needs to change. "I think we should have a longer sch...
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【判断题】火星表面的重力加速度和逃逸速度都比地球小
A.
正确
B.
错误
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【单选题】President Obama said, “Steve was among the greatest of American ( )”
A.
investigations
B.
dictators
C.
elevators
D.
innovators
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【简答题】Passage A American schoolkids attend school for fewer days than children in other educationally advanced countries, a situation President Obama said Monday needs to change. I think we should have a lo...
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【单选题】President Obama said there is no ____________ that all the steps agreed to at the meeting will work, but he thought they applied the right medicine.
A.
participation
B.
appreciation
C.
guarantee
D.
procedure
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【简答题】WASHINGTON—US President Barack Obama said Thursday that he had known about NBA star Jeremy Lin’s talent long before the“Linsanity”phenomenon swept the sport. “I knew about Jeremy before you did becaus...
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【判断题】表面反射法适用于不透明宝石或弧面型宝石,光从宝石表面反射出来,分光镜对准反射出来的光线进行观察。
A.
正确
B.
错误
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【单选题】The US president Obama said his country will sign a peace treaty with the DPRK (朝鲜) _____ the latter gets rid of all its nuclear facilities. [     ]
A.
while
B.
even if
C.
so that
D.
provided
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【单选题】President Obama said the U.S.government must be able to act _______ when information surfaces about a potential threat.
A.
decisively
B.
spiritually
C.
exclusively
D.
capriciously
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相关题目：
【单选题】公式 ∆ H=Q p 适用于下列过程中的( )
A.
理想气体从 1013.25kPa反抗恒定外压101.325kPa膨胀
B.
273K，101.325kPa下冰融化成水
C.
298K，101.325kPa下电解CuSO 4 水溶液
D.
气体从状态 I 等温可逆变化到状态 II
查看完整题目与答案
【简答题】American schoolkids attend school for fewer days than children in other educationally advanced countries , a situation President Obama said Monday needs to change. "I think we should have a longer sch...
查看完整题目与答案
【判断题】火星表面的重力加速度和逃逸速度都比地球小
A.
正确
B.
错误
查看完整题目与答案
【单选题】President Obama said, “Steve was among the greatest of American ( )”
A.
investigations
B.
dictators
C.
elevators
D.
innovators
查看完整题目与答案
【简答题】Passage A American schoolkids attend school for fewer days than children in other educationally advanced countries, a situation President Obama said Monday needs to change. I think we should have a lo...
查看完整题目与答案
【单选题】President Obama said there is no ____________ that all the steps agreed to at the meeting will work, but he thought they applied the right medicine.
A.
participation
B.
appreciation
C.
guarantee
D.
procedure
查看完整题目与答案
【简答题】WASHINGTON—US President Barack Obama said Thursday that he had known about NBA star Jeremy Lin’s talent long before the“Linsanity”phenomenon swept the sport. “I knew about Jeremy before you did becaus...
查看完整题目与答案
【判断题】表面反射法适用于不透明宝石或弧面型宝石,光从宝石表面反射出来,分光镜对准反射出来的光线进行观察。
A.
正确
B.
错误
查看完整题目与答案
【单选题】The US president Obama said his country will sign a peace treaty with the DPRK (朝鲜) _____ the latter gets rid of all its nuclear facilities. [     ]
A.
while
B.
even if
C.
so that
D.
provided
查看完整题目与答案
【单选题】President Obama said the U.S.government must be able to act _______ when information surfaces about a potential threat.
A.
decisively
B.
spiritually
C.
exclusively
D.
capriciously
查看完整题目与答案
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