在我心中老师最凶

制取氢气的化学式用标沉淀符号吗Mg+H2SO4===MgSO4+H2Zn+H2SO4===ZnSO4+H2Fe+2HCl===FeCl2+H2这三个制取氢气的化学方程式中用标“↑”这个符号吗用标“↓”这个符号吗 硫酸锌 硫酸镁 氯化亚铁它们可以 MgCO3要写沉淀符号吗? I won't tell you,that's a secret! It is awsome that I can tell you that! 物理吸附和化学吸附的区别 1）丁达尔效应：__________,胶体的这一性质,属于一种__________现象,具体地说,属于光的__________射现象.溶液,浊液是否会发生丁达尔效应?这一性质有什么用途?第二个格子填什么呀?光传播? 高三化学的基础知识梳理怎么做? The secret___ before an important exam is to tell yourself that it's not a big deal even if you faiC.calming down D.to calming down这两项有什么区别,the +noun +to v-ing的原因是什么 高三化学一个基础问题,谢谢!①H2PO4-与PO43-为什么不可以共存?说明原因比写出相关化学方程式.谢谢! Who am I,that is the secret I will never tell 如何打好高三化学基础? Is it beautiful?could you tell me?Why did you say that?I want to know.将它们合成宾语从句 化学成为一门独立学科的标志是什么 化学成为真正的学科始于化学真正成为的一门学科并得以较快发展,始于（ ）A.舍勒发现氧气B.质量守恒定律的发现C.原子—分子论的诞生D.中国湿法冶金技术的推广 什么学说的建立使化学成为独立学科 CaSO4是沉淀吗 我做的糯米酒为什么不甜 I won't tell you my secret unless you____ not to tell anyoneA promising B promised C are promising D are going to promise答案a 原因 This is just between you and me.You_________tell anyone about this.A.mustn't B.can C.should D.This is just between you and me.You_________tell anyone about this.A.mustn't B.can C.should D.have not to 填上合适的单词This is a p___ secret.Don't tell anyone elseDon't always c__ yourchildren with others.If I go to the old people's home,I wil bring them some f___.是什么意思? Don't tell the secret to _____(任何人） else 用anyone 还是someone CaSO4 溶于硝酸吗? CaSO4.2H2O溶于硝酸,为什么?为什么呢? CaSO4溶于稀硝酸吗?谁有扎实的基础和肯定的答案就回答, 硫化氢气体使酸性高锰酸钾溶液褪色的化学方程式 I can't tell you now-I'll have to ()it.A.think of B.think about C.think over.D.think out It's so dark.I can't tell you____it's a boy____a girl.A:if,and B:that,and C:whether,or D :if,orhelp me! can you tell me__?i think it's BEN'sA.where he livesB.where does he livesC.whose the dictionary is?说明理由。C选项好像应该是whose the dictionary it is you/I/before/tell/open/to/can't/it 连词成句, 氧气吸多了, 氧气吸多了有什么害处 氧气吸多了对人有没有坏处.谢谢