皮皮学，免费搜题
登录
搜题
【简答题】
A、B、C、 D、E都是原子序数依次增大的五种短周期元素，已知： ①A和C属同族元素，且A元素的原子半径是短周期元素原子中半径最小的； ②A和B能形成组成为A 2 B和A 2 B 2 的两种化合物； ③D元素原子所形成的离子在同周期元素原子形成的离子中半径是最小的；且D元素原子的最外层电子数是E元素原子最外层电子数的一半。 请回答： （1）A元素是________；C元素是_________。D元素是_________。E元素是_________。（填元素符号） （2）化合物A 2 B 2 的所含化学键______________电子式是____________； （3）B和E形成两种常见化合物是_________和_________。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【单选题】The _____ kids learn to be independent, the better it is for their future.
A.
later
B.
latest
C.
earlier
D.
earliest
查看完整题目与答案
【单选题】______, that step is not safe!
A.
Look around
B.
Look up
C.
Look out
D.
Look down
查看完整题目与答案
【单选题】\t已知25℃时，电对MnO 4 - /Mn 2+ （电极反应MnO 4 - +8H + +5e - =Mn 2+ +4H 2 O）的ψ θ （MnO 4 - /Mn 2+ ）=1.51V，若此时［H + ］由1mol·L -1 减少到10 -4 mol·L -1 ，则该电对的电极电位变化值为（）。
A.
上升0.38V
B.
下降0.38V
C.
上升0.047V
D.
下降0.047V
查看完整题目与答案
【简答题】Envy the kids at school who are smarter than you and seem to learn more quickly? Don’t worry．     1____________________ 2.  _______________    However, according to a recent study, IQ can rise—not jus...
查看完整题目与答案
【单选题】已知 25 °C时电极反应 MnO 4 - + 8 H + + 5 e - = Mn 2 + + 4 H 2 O 的 E = 1 . 51 v ,若 [H + ] 由 1 . 0 mol ∙ L - 1 减小到 1 . 0×10 - 4 mol ∙ L - 1 ,则该电对的电 极电势变化值为
A.
上升0.38 v
B.
上升0.047
C.
下降0.38 v
D.
下降0.047 v
查看完整题目与答案
【单选题】______, that step is not safe.
A.
Look around
B.
Look out
C.
Look up
D.
Look down
查看完整题目与答案
【单选题】In order to improve communications with kids, parents should ______.
A.
learn more about the modern techniques and try to adjust all of them
B.
learn to use modern ways to communicate with kids, such as texting messages
C.
try to share some modern and meaningful computer games with kids
D.
earn enough money to buy modern machines for kids to satisfy their needs
查看完整题目与答案
【单选题】已知电极反应 MnO 4 - + 8H + +5e - Mn 2+ + 4H 2 O , φ y ( MnO 4 - / Mn 2+ ) = 1.51V ,求当 c ( H + ) = 0.1 mol·L -1 , c ( MnO 4 - ) = c ( Mn 2+ ) =0.5 mol·L -1 时, φ ( MnO 4 - / Mn 2+ ) 为( )。
A.
1.32 V
B.
1.42 V
C.
1.45 V
D.
1.52 V
查看完整题目与答案
【简答题】Jealous of the kids at school who are smarter than you and seem to learn more quickly? Don’t worry． 71 72 However, according to a recent study, IQ can rise—not just by one or two points, but by as man...
查看完整题目与答案
【简答题】电极反应 MnO 4 - + 8H + + 5e - = Mn 2+ + 4H 2 O 。已知 φ Θ ( MnO 4 - /Mn 2+ ) = 1.507 V , 若 c ( MnO 4 - ) = c (Mn 2+ ) = 1 mol∙L -1 , 当 H + 浓度为 10 mol∙L -1 时的电极电势为 ___。
查看完整题目与答案
相关题目：
【单选题】The _____ kids learn to be independent, the better it is for their future.
A.
later
B.
latest
C.
earlier
D.
earliest
查看完整题目与答案
【单选题】______, that step is not safe!
A.
Look around
B.
Look up
C.
Look out
D.
Look down
查看完整题目与答案
【单选题】\t已知25℃时，电对MnO 4 - /Mn 2+ （电极反应MnO 4 - +8H + +5e - =Mn 2+ +4H 2 O）的ψ θ （MnO 4 - /Mn 2+ ）=1.51V，若此时［H + ］由1mol·L -1 减少到10 -4 mol·L -1 ，则该电对的电极电位变化值为（）。
A.
上升0.38V
B.
下降0.38V
C.
上升0.047V
D.
下降0.047V
查看完整题目与答案
【简答题】Envy the kids at school who are smarter than you and seem to learn more quickly? Don’t worry．     1____________________ 2.  _______________    However, according to a recent study, IQ can rise—not jus...
查看完整题目与答案
【单选题】已知 25 °C时电极反应 MnO 4 - + 8 H + + 5 e - = Mn 2 + + 4 H 2 O 的 E = 1 . 51 v ,若 [H + ] 由 1 . 0 mol ∙ L - 1 减小到 1 . 0×10 - 4 mol ∙ L - 1 ,则该电对的电 极电势变化值为
A.
上升0.38 v
B.
上升0.047
C.
下降0.38 v
D.
下降0.047 v
查看完整题目与答案
【单选题】______, that step is not safe.
A.
Look around
B.
Look out
C.
Look up
D.
Look down
查看完整题目与答案
【单选题】In order to improve communications with kids, parents should ______.
A.
learn more about the modern techniques and try to adjust all of them
B.
learn to use modern ways to communicate with kids, such as texting messages
C.
try to share some modern and meaningful computer games with kids
D.
earn enough money to buy modern machines for kids to satisfy their needs
查看完整题目与答案
【单选题】已知电极反应 MnO 4 - + 8H + +5e - Mn 2+ + 4H 2 O , φ y ( MnO 4 - / Mn 2+ ) = 1.51V ,求当 c ( H + ) = 0.1 mol·L -1 , c ( MnO 4 - ) = c ( Mn 2+ ) =0.5 mol·L -1 时, φ ( MnO 4 - / Mn 2+ ) 为( )。
A.
1.32 V
B.
1.42 V
C.
1.45 V
D.
1.52 V
查看完整题目与答案
【简答题】Jealous of the kids at school who are smarter than you and seem to learn more quickly? Don’t worry． 71 72 However, according to a recent study, IQ can rise—not just by one or two points, but by as man...
查看完整题目与答案
【简答题】电极反应 MnO 4 - + 8H + + 5e - = Mn 2+ + 4H 2 O 。已知 φ Θ ( MnO 4 - /Mn 2+ ) = 1.507 V , 若 c ( MnO 4 - ) = c (Mn 2+ ) = 1 mol∙L -1 , 当 H + 浓度为 10 mol∙L -1 时的电极电势为 ___。
查看完整题目与答案