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【简答题】
语法填空(共20小题,每空1.5分,共30分)。 Li daiyu and Liu Qian were 1____a trip across Canada. 2____than take the aeroplane all the way, they would go 3____Canada by train after arriving in Vancouver by air. Canada is the second 4____(large) country in the world. It’s 5,500 kilometers from coast to coast. As they went eastward, they saw 5____(beauty) scenery as well as large cities. Vancouver 6____(surround) by mountains and the Pacific Ocean. 7____(settle) down in their train seats, they looked out of the window at some mountain goats, a grizzly bear and an eagle. They went by the city of Calgary. It is famous for Calgary Stampede. Many of the cowboys 8____(take) part in the competition there have a gift 9____riding horse. Then they arrived in Thunder Bay, a city at the top of the Great Lakes, and learnt even more about Canada and its 10____(nature) scenery.
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【单选题】计算下列 0.10mol·L -1 Na 2 S 溶液的 PH 。已知 H 2 S 的 Ka1=1.3*10 -7 ,Ka2=7.1*10 -15
A.
12.97
B.
6.74
C.
5.27
D.
1.84
【简答题】计算 0.10mol·L -1 Na 2 S 溶液的 pH 值。已知 H 2 S 的 Ka 1 =1.3×10 -7 , Ka 2 =7.1×10 -15
【单选题】已知H2S的Ka1=8．9×10-8，Ka2=1．0×10-19，则浓度为0．050mol.L一1的H2S溶液的[S2-]为( )mol.L-1。
A.
1．0×10-7
B.
8．9×10-8
C.
6．0×10-15
D.
1．0×10-19
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