问题 选择题

下列说法正确的是(  )

A.在0.1mol•L-1Na2CO3溶液中,加两滴酚酞显浅红色,微热后红色加深,说明盐类水解反应是吸热反应

B.已知MgCO3的Ksp=6.82×l0-6,则在含有固体MgCO3的MgCl2、Na2CO3溶液中,都有c(Mg2+)=c(CO32-),且c(Mg2+)•c(CO32-)=6.82×10-6mol2•L-2

C.等体积、pH都为3的酸HA和HB分别与足量的锌反应,HA放出的氢气多,说明酸性:HA>HB

D.已知:

共价键C-CC=CC-HH-H
键能/kJ•mol-1348610413436
上表数据可以计算出(g)+3H2(g)→(g)的△H

答案

A.滴有酚酞的Na2CO3溶液显示红色,是由于碳酸钠溶液中的碳酸根离子水解溶液呈碱性,其中碳酸根离子水解程度受温度的影响,微热,溶液颜色逐渐变深,说明温度高,水解程度大,碱性增强,所以盐类水解是吸热反应,故A正确;

B.含有固体MgCO3的MgCl2、Na2CO3溶液中,c(Mg2+)不一定等于c(CO32-),但c(Mg2+)•c(CO32-)=6.82×10-6 mol2•L-2,故B错误;

C.当体积、pH都为3的酸HA和HB分别与足量的锌反应,HA放出的氢气多,说明HA的物质的量大于HB的物质的量,溶液的体积相等,HA的物质的量浓度大于HB的,所以说明酸性:HA<HB,故C错误;

D.因为苯环中的碳碳键是介于单双键之间的一种独特的键,不存在典型的碳碳双键和碳碳单键,不能用以上表中进行计算,故D错误;

故选:A.

阅读理解

Hanging Gardens of Babylon(巴比伦空中花园)

The Hanging Gardens of Babylon were built in the 7th century BC and are considered one of the Seven Wonders of the Ancient World. The Hanging Gardens of Babylon were amazing not only because of their beauty, but also because of their location.

In the 7th century BC a king named Nebudchadnezzar II created the gardens as a sign of love for his wife, Amyitis. According to legend, Amyitis, the daughter of the king of the Medes, was homesick. She missed the green hills and valleys of her homeland.

Upon marrying Nebudchadnezzar II, Amyitis moved to the ancient chief city of Babylon. The area was in the Mesopotamian desert, and the climate there was totally different from where she had left. So the new queen was very sad about the flat and the sun-baked desert. To make Amyitis happier and more comfortable the king decided to build her a series of magnificent gardens.

Many think of the gardens as an otherworldly creation that hung in the air somehow. But experts agree that the gardens were actually built on a mountainside, rather than actually “hanging”.

The hanging Gardens of Babylon are famous. Stories of them spread throughout the ancient world, and ancient writers recorded a large number of descriptions of the gardens, but some wonder whether this paradise of the past ever existed. There are no historical records of it except stories. Whatever may happen, even the idea of the Hanging Gardens of Babylon is amazing. They were essentially impossible to create because of the climate, but they were kept in the minds of many as a botanical beauty created in the middle of unattractive desert scenery.

小题1:Hanging Gardens of Babylon are considered one of the Seven Wonders of the Ancient World, aren’t they?

小题2:What makes the Hanging Gardens of Babylon so amazing and famous?

小题3:Why did the king Nebudchadnezzar II create Hanging Gardens of Babylon?

小题4:What made the Hanging Gardens of Babylon essentially impossible to create?

小题5:According to the experts, were the Hanging Gardens of Babylon really hanging or built on a mountainside?

小题6:Did Hanging Gardens of Babylon really exist? What makes you think so? (In no more than THREE sentences)

单项选择题