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下列符号能表示2个氧分子的是（ ）
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下列符号表示1个氧分子的是
2O
O
2-
O
O
2
下列符号中表示两个氧分子的是
2O
O
2
2O
2
O
2-
表示两个氧分子的符号是
2O
2
O
2
2O
O
4
下列符号表示1个氧分子的是
2O
O
2-
O
O
2
下列化学符号表示2个氧分子的是
2O.
O
2-
2O
2
CO
2
1用元素符号和数字表示2个氧分子3个氖原子钠离子2写出下列符号所表示的意义Fe2Fe3H2O3书写下
下列符号表示2个氧分子的是
O
2
2O
2O
2
2O
2
-
下列符号中表示两个氧分子的是
O
2
2O
2
2O
O
2-
下列符号能表示2个氧分子的是
2O
2
O
2
2O
2O
2-
下列微粒符号中对2的含义理解正确的是
2Mg表示2个镁元素
2CO 表示2个一氧化碳分子
Zn
2+
表示Zn的化合价为+2价
H
2
O
2
表示个氧分子和1个氢分子
下列符号能表示两个氧分子的是
2O
2
2O
2CO
2
H
2
O
2
下列符号能表示2个氧分子的是
2O2
2O
O2
2O2-
化学用语是国际通用的化学语言下列有关说法正确的是
2O表示2个氧分子
钠离子的符号是Na
+
一氧化碳的化学式是Co
CO
2
中含有氧分子
化学用语是国际通用的化学语言下列有关说法正确的是
2O表示两个氧分子
钠离子的符号为Na
+
一氧化碳的化学式是Co
H
2
O中含有氧分子
用化学符号表示1四个氧分子________________22个碳酸根离子___________3氯
用化学符号表示⑴钠元素____________⑵三个磷原子___________⑶氩气_______
写出下列化学符号或符号所表示的意义13个氢原子2氧分子32Na+4水___________5钙元素_
写出下列符号表示的意义N的宏观意义2N表示三个氧原子三个氧分子三个钠离子.
下列符号能表示两个氧分子的是
O
2
2O
2O
2
2O
2-
下列符号中表示两个氧分子的是
O2
2O2
2O
O2-
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IwasshoppinginasupermarketlastnightwhenIsawahomelesswomanwithatrolley手推车fullofallherthings.Shewassittinginsidetokeep1.Iwentuptoherandtriedtogiveher2forsomethingtoeat.Shewouldn't3it.IsaidIwantedtohelpher4shesaidthatifenoughmoneywasgiventoherthatdayandshehadmoneyonherotherhomelesspeoplewould5itfromherwhilesheslept. I6thatIwantedtohelpherandaskedifIcouldbuyhersomethingwarm.7shesaidno.Shethankedmeandsaidhow8shewasthatIhadspokentoherandoffered9.WeintroducedourselvesandshesaidthatwhenIsawherthenexttimeshewould10accepthelp. Iwalkedoutintothecoldwinter11andgavethemoneytoahomelessmanwhowasfreezing.Iaskedhimhisname12IalwayswanttoknowandItoldhimmine.HappearedtohavehadadrinkingordrugproblembutIwas13thatheacceptedmyhelp. Ihadthis14thatstayedwithme.IfeltthatIhadbeeninthepresenceofsomeonereallyspecialearlier.Ialways15whatitwouldbeliketobeinahomelessperson'sshoesIknowhow16IamandhowgratefulIamforwhatI17inmylife. Ilearnedavaluable18fromtheladyImetNotall19peoplewilltakemoneyorhelpiftheyfeelenoughhasbeengiventothemthatday.Shewasgratefulfortheday.IwillmakesureI20heragain. 1Acalm B.warm C.healthy D.energetic 2A.time B.freedom C.money D.choice 3A.take B.make C.eat D.receive 4A.and B.or C.so D.but 5A.spend B.steal C.find D.hide 6A.agreed B.wondered C.apologized D.explained 7A.Again B.Besides C.Instead D.Thus 8A.proud B.curious C.regretful D.grateful 9A.help B.food C.strength D.advice 10A.generously B.willingly C.slightly D.politely 11A.morning B.noon C.afternoon D.night 12A.unless B.when C.because D.though 13A.glad B.sure C.astonished D.puzzled 14A.hope B.feeling C.belief D.courage 15A.expect B.believe C.imagine D.remember 16A.lucky B.unique C.serious D.confident 17A.observe B.own C.support D.respect 18A.fact B.quality C.lesson D.subject 19A.lonely B.hungry C.helpless D.homeless 20A.call B.ask C.meet D.follow
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