题目

补全下面的内容。 There are four in a year. And I like best. The weather is windy and . The birds sing songs in the sky. There are pretty everywhere. I often go on a with my family. We are so happy in spring. 答案:【1】seasons【2】spring【3】warm【4】flowers【5】picnic 已知: BaO(s)+ H2O(l)= Ba(OH)2(s)                       △H = -103 kJ·mol-1 Ba(OH)2(s) + aq = Ba2+(aq)+ 2OH-(aq)                  △H = -52 kJ·mol-1 Ba(OH)2·8H2O(s)+ aq = Ba2+(aq)+ 2OH-(aq)+ 8H2O   △H = + 64 kJ·mol-1 请回答下列问题,若能,给出答案;若不能,简述原因。 (1)能求得BaO(s)的溶解热吗? (2)能求得Ba(OH)2(s)转变成Ba(OH)2·8H2O(s)能量变化吗? (3)能求得“O2-”(s)+ H2O(l)= 2OH-(s)的能量变化吗? (4)能求得“O2-”(s)+ aq = 2OH-(s)的能量变化吗?
英语 试题推荐