【简答题】燃料电池是利用燃料(如CO、H 2 、CH 4 等)与氧气反应,将反应产生的化学能转变为电能的装置,通常用氢氧化钾作为电解质溶液。 (1)完成下列关于甲烷(CH 4 )燃料电池的填空: ①甲烷与氧气反应的化学方程式为: ②已知燃料电池的总反应式为CH 4 +2O 2 +2KOH==K 2 CO 3 +3H 2 O,电池中有一极的电极反应为CH 4 +10OH - -8e - ='=' CO 3 2...
【简答题】据报道,最近摩托罗拉(MOTOROLA)公司研发了一种由甲醇和氧气以及强碱做电解质溶液的新型手机电池,电量是现用镍氢电池和锂电池的10倍,可连续使用1个月充电一次。假定放电过程中,甲醇完全氧化产生的CO 2 被充分吸收生成CO 3 2- (1)该电池反应的总离子方程式为____________________________ (2)甲醇在_________极发生反应(填正或负),电池在放电过程中溶...
【单选题】一对心曲柄滑块机构,若以滑块为机架时,则将演化成( )机构
【单选题】—Going outing at weekend is an exciting thing for many urban people. —________. It has attracted many people. [ ]
【单选题】The remarkable thing about the mayoral race, in retrospect, is that so many people wanted the job of managing a municipality so obviously about to ______.
【单选题】我国海岸电台对国际船舶窄带直接印字电报自动操作按()数收取岸台费。
【单选题】The thing that many western people might feel uncomfortable is that _______.
A.
there are too many buffet restaurants in China
B.
Chinese eat too much than they really need
C.
Chinese use chopsticks to pick up food repeatedly
D.
So many Chinese are too fat
【单选题】( ) 21. There’s _________ umbrella behind the door.