问题 选择题

含溶质20.0g的NaOH稀溶液与足量稀盐酸反应,放出28.7 kJ的热量,表示该反应的热化学方程式正确的是

A.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H=" +28.7" kJ·mol-1

B.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H="-28.7" kJ·mol-1

C.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H=" +57.4" kJ·mol-1 

D.NaOH(aq)+HCl(aq)==NaCl(aq)+H2O(l);△H="-57.4" kJ·mol-1

答案

答案:D

题目分析:20.0g氢氧化钠是0.5mol,因此1mol氢氧化钠完全反应放出的热量应该是28.7 kJ×2=57.4 kJ,D正确。放热反应中△H小于0,AC不正确;B中热量数值不正确,答案选D。

点评:该题是高考中的常见题型,属于基础性试题的考查。试题基础性强,侧重对学生基础知识的巩固和训练,该题的关键是明确热化学方程式的含义,然后结合题意灵活运用即可。

阅读理解

阅读理解。

     Every morning Steve goes to work by train. He always buys a newspaper. It helps to make the time

pass more quickly.

     One Tuesday morning, he turned to the sports page. He wanted to read the report about an important

football match the night before. The team of his town won the match. The report was so interesting that

he forgot get off at his station. He didn't know it until he saw the sea. He got off at the next station, and

had to wait a long time for a train to go back. Of course, he arrived very late at the office. His boss (老板)was very angry when Steve told him why he was late.

(A) 根据短文内容,判断句子正(T)误(F)。

(     )1.Steve always buys a newspaper when he goes to work because he wants to read sports about

football match.

( )2.One Tuesday morning Steve forgot to buy a newspaper.

(     )3.The important football match was held on Monday evening.

(     )4.Steve found the train had gone too far when he finished reading the report.

(     )5.After Steve got off the train, he had to walk back to his office.

(B) 根据短文内容,完成下列句子,每空填一词,首字母已给出。

6.Steve e______ reading a newspaper on a train to make the time pass quickly.

7.One Tuesday morning Steve b______a newspaper as usual (像往常一样).

8.The report told Steve the team of his town was the w______.

9.The train had gone too far b______ he saw the sea.

10.After Steve got off the train, he had to take a______ train back to his office.

不定项选择