知识问答
最佳答案:Don't have to be together morning and night,Don't have to be impressive,But be i
最佳答案:In fact ,you are not too perfect to be taken place of,and you never understand m
最佳答案:I want to be around as always.For me,you are so unique and nobody can ever repla
最佳答案:The one which never touch me with initiative.The one which is irreplaceable.这样的人
最佳答案:解题思路:(1)都为氧化物,其中SO2为气体,Na2O2中O元素的化合价为-1价,其它氧化物为-2价;(2)能发生反应的有:SiO2与CaO、Na2O2与SO2
最佳答案:解题思路:①Na2O2、CuO、Al2O3、Fe2O3均为金属氧化物;只有Na2O2为过氧化物;②利用反应中是否存在电子的转移判断氧化还原反应与非氧化还原反应,