下列关于中和热、燃烧热的说法不正确的是[ ] A．已知下列热

搜题请搜索小程序“爱下问搜题”

问题选择题

下列关于中和热、燃烧热的说法不正确的是[ ]

A．已知下列热化学方程式：2H₂(g)+O₂(g) === 2H₂O(g) △H＝－484kJ/mol，则氢气的燃烧热为

242kJ/mol

B．中和反应的实质是H⁺与OH^-结合生成水，若有其它物质生成，这部分反应热不在中和热内

C．物质的燃烧热可利用仪器由实验测得

D．中和热不包括物质溶解、电离、水合等过程中的热效应

答案

答案：A

改错题

Dear Peter,

Thanks very much on inviting me to your birthday 86. ________

party on Sunday. I'd like very much come but 87. ________

I had an examination on Monday morning. It is 88. ________

a very important exam but I can't afford to 89. ________

fail it. I'll spend all the whole weekend reading 90. ________

and prepare for it. So I'm really sorry that 91. ________

I won't be able to come in this time. Hope you 92. ________

can understand. I'll take this chance to wish 93. ________

you wonderful time on your birthday. Happy 94. ________

birthday, Peter, and many happy return of the day! 95. ________

Yours,

Li Ming

多项选择题

在用气瓶办理使用登记时，应向登记机关提供以下（）等文件。

A.气瓶产品安全质量监督检验证书（复印件）；

B.《气瓶登记表》一式两份，并附电子文本；

C.气瓶产权证明和检验合格证明；

D.气瓶使用单位代码。