问题 选择题

某化学科研小组研究在其他条件不变时,改变某一条件对化学平衡的影响,得到如下变化规律(图中p表示压强,t表示温度,n表示物质的量):

根据以上规律判断,下列结论正确的是

A.反应Ⅰ△H> 0,P2>P1

B.反应Ⅱ△H<0,T1>T2

C.反应Ⅲ△H> 0,T2>T1;或△H<0,T2<T1

D.反应Ⅳ△H<0,T2>T1

答案

BC

反应I中温度越高,转化率越低,说明升高温度,平衡向逆反应方向移动,即正反应是放热反应,A不正确。反应Ⅱ中,T1表示的曲线显到达平衡状态,所以温度是T1>T2,但温度越高,C的含量越低,说明升高温度,平衡向逆反应方向移动,即正反应是放热反应,B正确。反应Ⅲ中,如果正反应是放热反应,则升高温度,平衡向逆反应方向移动,生成物的含量降低,即T2<T1。同样分析,如果正反应是吸热反应,则升高温度,平衡向正反应方向移动,生成物的含量增大,即T2>T1,C正确。反应Ⅳ中无法判断反应是放热反应还是吸热反应,不正确。答案选BC。

阅读理解

Australia is sometimes called “the lucky country”. One reason is the wonderful riches under the earth: gold, silver, iron, coal and many other precious metals. Oil and natural gas have helped to build big industries. Victoria, the southeastern state, has a large number of industries. Oil is no problem for them. The Bass Strait, off the coast of Victoria, has been one of the country's biggest oil fields for many years.

South Australia is the driest of all the states, but it does have the Murray River. The river brings greenness and life to the state's southeast corner. In the early days of Australian history, the Murray River was South Australia's main road. Before real roads and railways came, the river carried people and goods from the coast up into the country. Some towns on the Murray still keep the old riverboats, and visitors can ride on them.

小题1:People sometimes call Australia “the lucky country”, because ____ .

A.the people in Australia are very lucky

B.Australia has a large number of industries

C.there is the biggest oil fields of the world

D.the country has very rich natural resources小题2:What do you think of South Australia?

A.It's a scene of desolation(荒凉).

B.It's a scene of desert.

C.The land is full of life.

D.The land lies waste.小题3:Which of the following gives you a correct idea of the Murray River?

a.It lies in the south of the country.

b.It is the largest river of the country.

c.It irrigates the driest of the country.

d.It brings greenness and life to the southeast corner.

e.It is still an important passageway to carry people and goods.

A.a, b, c and d

B.b, c, d and e

C.c, d, e and a

D.d, e, a and b小题4:Which of the following pictures shows the right position of Victoria?

D

单项选择题