【单选题】What does the man say he did at Paul's Lumber?
A.
Bought wood at a good price
B.
Purchased more than he needed
C.
Entered but did not buy anything
D.
Spoke to a customer representative
【单选题】25℃时,等体积的 ① pH=2 H 2 SO 4 溶液 ②0.005mol/L Ba(OH) 2 溶液 ③pH=10 Na 2 CO 3 溶液④pH=4 NH 4 Cl溶液中,发生电离的水的物质的量之比是
【单选题】常温下,对于1 L 0.005 mol·L -1 硫酸表述中正确的是( )
A.
由水电离出的c(H + )=1.0×10 -12 mol·L -1
C.
2c(H + )=c(SO 4 2- )+c(OH - )
D.
滴加稀氨水使pH=7,则c(NH 4 + )=c(SO 4 2- )
【简答题】It is point of honor with the customer not to let the shopkeeper guess what it is she really likes and wants until the last moment.
【单选题】下列说法正确的是
A.
向蒸馏水中滴加浓H 2 SO 4 时,K W 不变
B.
常温下,0.005mol·L -1 Ba(OH) 2 溶液pH为12
C.
Na 2 CO 3 水解的离子方程式为:CO 3 2 - + 2H 2 O H 2 CO 3 + 2OH -
D.
NaCl溶液和CH 3 COONH 4 溶液均显中性,两溶液中水的电离程度相同
【单选题】“高学历女性,低水平主妇”真正说明的问题是()。
C.
高学历女性的精力用在了她们认为更有价值的东西上
【简答题】Shopkeeper: 小题1: Tim: Hello, I’m looking for a pair of football boots for my father. Shopkeeper: Which color do you like? Tim: I like the red ones. 小题2: Shopkeeper: They’re 150 yuan Tim: ...
【简答题】25°C时,0.005mol/L的H2SO4溶液的pH_________________
【多选题】常温下,对于1L0.005mol·L -1 硫酸表述中正确的是
A.
由水电离出的c(H + )=1.0×10 -12 mol·L -1
C.
2c(H + )= c(SO 4 2 - )+ c(OH - )
D.
滴加稀氨水使pH=7,则c(NH 4 + )=' 2' c(SO 4 2 - )