问题 完形填空
阅读下面的短文,根据短文内容为每段文字选出标题。
             1   
Don’t fight with your classmates. Every one in the class needs help and friendship. Remember your classmates are the best ones to help you in school.
          F  
In school, don’t feel something difficult or boring. You should join in all kinds of activities. You should be interested in all subjects.
   2  
Don’t make any excuse if you do not do today’s work and leave it tomorrow. If the class is held up(耽误), it’s difficult to catch up with others.
            3 
Eating good meals is important, or you will think about food in class. Go to bed on time and keep having enough sleep. Do more sports to keep your body strong.
           4   
If you get bad marks in your tests, you can feel unhappy. It doesn’t matter, in fact. A person can’t be always successful. Sometimes he also has unpleasant things.
     5  
You should not play computers too much on weekends. You should go out for a walk and do your homework every day.
阅读短文内容,依照示例F将A-E分别填入文中空缺处,使标题与内容相匹配。
Do Today’s Work Today.
Keep Hopeful.
Keep Healthy.
Plan Your Time.
Protect Your Friendship.
Be Positive about School.
答案

小题1:E

小题2:A

小题3:C

小题4:B

小题5:D

小题1:从第一行第一段话,Don’t fight with your classmates.可知答案是E

小题2:从第一行第三段话,if you do not do today’s work and leave it tomorrow.可知答案是A

小题3:从第二行第一段话,Do more sports to keep your body strong.可知答案是C

小题4:从第二行第二段话,Sometimes he also has unpleasant things.可知答案是B

小题5:从第二行第三段话,You should not play computers too much on weekends.可知答案是D

问答题

(1)20世纪30年代,Eyring和Pelzer在碰撞理论的基础上提出化学反应的过渡态理论:化学反应并不是通过简单的碰撞就能完成的,而是在反应物到生成物的过程中经过一个高能量过渡态.图是NO2和CO反应生成CO2和NO过程中能量变化示意图,请写出NO2和CO反应的热化学方程式:______.

(2)红磷P(s)和Cl2(g)发生反应生成PCl3(g)和PCl5(g).反应过程和能量关系如图所示(图中的△H表示生成1mol产物的数据).根据上图回答下列问题:

①P和Cl2反应生成PCl3的热化学方程式______;

②PCl5分解成PCl3和Cl2的热化学方程式是______;

(3)科学家利用太阳能分解水生成氢气,再用氢气与二氧化碳在催化剂作用下反应生成甲醇,并开发出直接以甲醇(CH3OH)为燃料的燃料电池.已知:

CO(g)+

1
2
O2(g)=CO2(g);△H=-283.0kJ•mol-1

CH3OH(l)+

3
2
O2(g)=CO2(g)+2H2O(l)△H=-726.5kJ•mol-1

请回答下列问题:

液态甲醇不完全燃烧生成一氧化碳气体和液态水的热化学方程式为______

(4)已知稀溶液中,H2SO4与1molNaOH溶液恰好完全反应时,放出57.3kJ热量,写出表示H2SO4与NaOH反应的热化学方程式______.

(5)25℃、101kPa条件下充分燃烧一定量的甲烷气体生成CO2气体和液态水,放出热量为QkJ,经测定,将生成的CO2通入足量澄清石灰水中产生25g白色沉淀,写出甲烷燃烧的热化学方程式______.

(6)通常人们把拆开1mol某化学键所吸收的能量看成该化学键的键能.键能的大小可用于估算化学反应的反应热(△H),化学反应的△H等于反应中断裂旧化学键的键能之和与反应中形成新化学键的键能之和的差.

化学键H-HCl-ClH-Cl
生成1mol化学键时放出的能量436kJ/mol243kJ/mol431kJ/mol
写出常温常压下氢气与氯气反应的热化学方程式______;该反应中氢气与氯气的总能量______(填“大于”、“等于”、“小于”)氯化氢的总能量.

问答题 简答题