8、温度为500℃时，反应4NH₃+5O₂=4NO+6H₂O在5L的密闭容器中进行，半分钟后

NO的物质的量增加了0.3 mol，则此反应的化学反应速率为(　　 )。　　　　　　　　　　

A、^v(O₂)=0.01 mol/(L?s)　　　　 B、^v(NO)=0.6 mol/(L?s)

C、^v(H₂O)=0.003 mol/(L?s)　 　　D、^v(NH₃)=0.12 mol/(L?s)　

7、在一定温度下，下列叙述不是可逆反应A(g)+3B(g)　2C(g)达到平衡标志的是(　)。

　①C的生成速率与C的分解速率相等；②单位时间生成amol A，同时生成3amolB；

③A、B、C的浓度不再变化；④A、B、C的物质的量不再变化；⑤混合气体的总压强不再变化；⑥混合气体的总物质的量不再变化；⑦单位时间消耗amol A，同时生成3amol B；⑧A、B、C的分子数目比为1:3:2。

A. ②⑧　　 　　 B. ⑦④　　　　　 C. ①③　　　 　　　　 D. ⑤⑥　

6. 短周期中三元素a、b、c在周期表中的位置如图，下列有关这三种元素的叙述正确的是(　　 )。

A．a是一种活泼的非金属元素

B．c的最高价氧化物的水化物是一种弱酸

C．b的氢化物很稳定

D．b元素的最高化合物为+7价。　

5、下列说法不正确的是(　　 )。

A. 参加反应物质的性质是决定化学反应速率的主要因素 B. 光是影响某些化学反应速率的外界条件之一 C. 对于一个化学反应，既可以用反应物表示其化学反应速率，也可以用生成物

表示其化学反应速率。 D. 不管什么反应，增大浓度，或加热或加压，或使用催化剂，都可以加快反应速率

4、有关叙述：(1)非金属单质M能从N的化合物中置换出非金属单质N。(2)M原子比N原子容易得到电子。(3)单质M跟H₂反应比N跟H₂反应容易得多。(4)气态氢化物水溶液的酸性H_mM＞H_nN。(5)氧化物水化物的酸性H_mMO_x＞H_nNO_y。(6)熔点M＞N。能说明M比N的非金属性强的叙述是(　　 )。

A、①②③　　　　　　 B、②⑤　　　　　 C、①②③④⑤　　 D、全部　

3、下列物质互为同位素的是(　 )。

A、H₂和D₂ B、　 C、CO和CO₂ D、金刚石和石墨　

2．化学反应的实质是旧键断裂，新键的形成。据此下列变化不属于化学变化的是(　　 )。

A．白磷在260℃时转化为红磷　　　　　 B．石墨转化为金刚石

C．Na溶于H₂O　　　　　　　　　　　 D．NaCl熔化　

1．一种“即食即热型快餐”适合外出旅行时使用。其内层是用铝箔包裹的、并已加工好的真空包装食品，外层则是分别包装的两包化学物质，使用时拉动预留在外的拉线，使这两种化学物质反应，此时便可对食物进行加热，这两包化学物质最合适的选择是(　 )。

　A．浓硫酸与水　　 B．生石灰与水　　C．熟石灰与水　　　 D．氯化钠与水　

第二节：书面表达(25分)

今天你班同学就“Should we stay up for study?”这一话题进行了辩论。假定你是主持人，请根据以下表格中的内容，为辩论会写一个总结，并谈谈你的看法。

注意：

1.词数120左右；

2.可适当增加细节，使短文连贯；

3.开头已给出，但不计入总词数。

We’ve had a heated debate today on wheter we senior students should stay up for study or not and we have different opinions.

改错：

I was walking home with my cousin form a Chinese restaurant.We were holding a bag full(of) food.On the way,I saw an old man with a sign said(saying) “save Me”at the crossing. He was in a wheelchair.but(and) looked like he was extreme(extremely) hungry. It was such(a) cold night that my heart went out to him.I remembered that(去掉) my bag with all the warm food and gave them(it) to him.Before he could react,the signal turns(turned) green and we began(to) cross the road.I think this is how acts of kindness should be-when you can’t even be thanked but natural(naturally) do what you think you should.

作文

We’ve had a heated debate today on wheter we senior students should stay up for study or not and we have different opinions

Some 　believe　 that they should not stay up for extra study because having a good rest can make them refresh　 in our brain , so that they can get more the next day. Besides,don’t put off until tomorrow what can be.done today. In this way they can also kick off the bad habit of laziness.

On the other hand , however ,many more students hold the opposite opinions. They think they shoud stay up for study　 because they have to deal with many subjects and do more homework. At the same time ,too many difficult problems and obstacles force them to stay up for study. What’s more ,it is good for them to strengthen what they have learned.

In general ,every coin has two sides. In my opinion,we can stay up for study on condition that we can shorten the time and make sure it doesn’t affect the study of the next day.

第一节：短文改错(共10小题；每小题1分)

假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10处语言错误，每句中最多有两处。错误涉及一个单词的增加，删除或修改。

注意：每处错误及其修改均仅限一词，只允许修改10处。

I was walking home with my cousin form a Chinese restaurant.We were holding a bag full food.On the way,I saw an old man with a sign said “save Me”at the crossing. He was in a wheelchair.but looked like he was extreme hungry. It was such cold night that my heart went out to him.I remembered that my bag with all the warm food and gave them to him.Before he could react,the signal turns green and we began cross the road.I think this is how acts of kindness should be-when you can’t even be thanked but natural do what you think you should.