【单选题】下列各项内容中,排列顺序正确的是 ①固体的热稳定性:Na 2 CO 3 >CaCO 3 >NaHCO 3 ②物质的熔点Li>Na>K ③微粒半径:K + >S 2 - >F - ④单质的密度Na<K<Rb ⑤氢化物的沸点:H 2 Se>H 2 S>H 2 O
【单选题】下列各项内容中,排列顺序正确的是( ) ①固体的热稳定性:Na 2 CO 3 >CaCO 3 >NaHCO 3 ②物质的熔点Li>Na>K ③微粒半径:K + >S 2 - >F - ④单质的密度Na 2Se>H 2 S>H 2 O
【单选题】平流式沉淀池一般有四部分组成,下列( )不属于其组成部分。
【简答题】That night Porter (L14) _______________________ company literature and discovered the products were guaranteed. He would sell that pledge. He just needed people to listen.
【单选题】下列各组物质的性质比较中,正确的是
C.
离子的还原性:I — >S 2— >Br — >Cl —