[問題] campbell test bank 三題問題

[qiuqiuhsu (球球)]

【問題】：大家好!我想請教一下三題的原文問題，麻煩請大家幫我解答，感恩
(1)A salamander relies on hydrogen bonding to stick to various surfaces.
Therefore, a salamander would have the greatest difficulty clinging to a ____
a)slightly damp surface
b)surface of hydrocarbons
c)surface of mostly carbon-oxygen bonds
d)sruface of mostly carbon-nitrogen bonds
ans:b
個人看法:這題是指van der walls forces中的氫鍵嗎？如是，那為何不是"a"？感恩

(2)An atom has four electrons in its valence shell.What types of covalent
bonds is it capable of forming
a)single,bouble, or triple
b)single and double only
c)single bonds only
d)double bonds only
ans:a
個人看法:可以舉例形成triple bond的元素嗎？感恩!(因我找不到><"")

(3)Nitrogen(N)normally forms three covalent bonds with a valence of 5.However,
ammonium has four covalent bonds,each to a different hydrogen(H)atom(H has a
valence of 1).What do you predict to be the charge on ammonium？
a)+1
b)-1
c)+2
d)-2
ans:a
個人看法:這題Nitrogen不是只能與Hydrogen形成三個共價鍵？就算形成四個共價鍵，那
就不是多拿了一個電子，所以應該是-1，怎麼會是+1呢？煩請賜教，感恩!










--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 101.138.145.169
※ 文章網址: https://www.ptt.cc/bbs/Biology/M.1434959247.A.239.html
→ fishg1216: 2）CO
→ fishg1216: 3） 維基百科有寫
→ fishg1216: NH3+H2O--->NH4+  +  OH-
推 leptoneta: 1.因為他是說利用氫鍵哪個最難爬...
→ leptoneta: 2.乙炔 H-C三C-H
→ leptoneta: 3.氮有五個可鍵結電子 丟一個電子就可以和四個氫形成
→ leptoneta: 穩定的銨離子 所以電荷是+1