在下列各说法中，正确的是_刷题宝

题干

在下列各说法中，正确的是（）

A：对于2SO₂(g)+O₂(g) 2SO₃(g) ΔH=－Q kJ·mol^－¹，(Q＞0)，若反应中充入1mol SO₂和足量的氧气反应时，放出的热量一定是Q/2 kJ

B：热化学方程式中的化学计量数不能用分数表示

C：Zn(s)+H₂SO₄(aq) =ZnSO₄(aq)+H₂(g) ΔH＜0，该反应的化学能可以转化为电能

D：ΔH的大小与热化学方程式的化学计量数无关

上一题下一题 0.0难度选择题更新时间:2015-12-17 04:44:03

答案(点此获取答案解析）

C

同类题1

阅读下面材料，从每题所给的A、B、C、D四个选项中，选出符合材料意思的最佳选项。

Today is Sunday. Everyone in Zootopia (疯狂动物城) is very happy.

I'm Judy. In the morning, I e-mail my friend at 10:00 a.m. Then, I go out for lunch with my mum in a restaurant (餐馆). But the food there isn't good, we don't like it. After that, I go to a store with my mum. The clothes there are on sale, so I buy a nice shirt at a very good price.

I'm Nick. I am Judy's good friend. I love sports. I always play basketball in the morning. But I don't play it this morning, because my uncle comes to see me. He loves basketball, too. We have lunch at home. In the afternoon, we go to a sports club at 1:00. There we help some boys with basketball for two hours.

同类题2

下列各组线段中，不能构成直角三角形的是（　　）

同类题3

下列四组生物的细胞结构最相似的是（）

同类题4

下面文段中划线词的解释有错误的一项是（）

少时，一狼径去，其一犬坐于前。久之，目似瞑，意暇甚。屠暴起，以刀劈狼首，又数刀毙之。方欲行，转视积薪后，一狼洞其中，意将隧入以攻其后也。

同类题5

We want students for the school show. If you _________ play the guitar, please talk to Mr. Zhang after school.

小学学科试题库

初中学科试题库

高中学科试题库