问题 填空题

胃酸过多是常见的胃病。下面是甲、乙两种常见胃药的说明摘要。

甲:①白色结晶状粉末,受热可缓缓分解;②能溶于水,水溶液呈弱碱性;灼烧时火焰为黄色;③遇酸及酸性药物则产生二氧化碳;④患者服用过量,可能引起胃胀气,甚至有引起胃溃疡穿孔的危险。

乙:①与胃酸是中和作用缓慢而持久,可维持3~4小时;②凝胶本身覆盖于溃疡面上,具有保护作用;③可溶于稀酸或氢氧化钠溶液中。

(1)请你推测,甲中含有的主要化学成份是             (填化学式);乙中含有的主要化学成份是            (填化学式)。

(2)试写出甲中含有的主要化学成份引起胃胀气反应的离子方程式:                                          

(3)三硅酸镁Mg2Si3O8·nH2O也是常用胃药,被用来治疗胃溃疡,是因为该物质不溶于水,服用后中和胃酸作用持久。把三硅酸镁改写成氧化物形式为:_____ ____。

答案

(1)NaHCO3 ; Al(OH)3

(2)HCO3-+H+==H2O+CO2

(3)2MgO·3SiO2·nH2O

单项选择题
阅读理解

Do you like chocolate? Maybe most people do. A box of it can be a great gift. Buy one for a friend and give it as a surprise. See how happy that person gets.

Say you just got a box of chocolate. Which piece do you pick first? A man has studied people’s choices. He says they tell something about the person. Did you choose a round piece? You are a person who likes to party. Did you choose an oval (椭圆形的) shape? You are a person who likes to make things. Picking a square shape shows something else. The person is honest and truthful. You can depend on him or her.

What kind of chocolate do you pick? Maybe you like milk chocolate. This shows you have warm feelings about the past. Dark chocolate means something else. A person who chooses it looks toward the future. What about white chocolate? Would you choose it? If so, you may find it hard to make up your mind. Some people like chocolate with nuts (果仁). These are people who like to help others.

Do you believe these ideas? Can candy tell all these things? It doesn’t really matter. There is one sure thing about eaters of chocolate. They eat it because they like it.

小题1:This passage mainly tells us ______.

A.why people like chocolate

B.almost everyone likes chocolate

C.about different kinds of chocolate

D.different choices may show different characters小题2:Picking a round shape of chocolate shows that a person ______.

A.likes singing, dancing and drinking

B.likes to do something for others

C.is good at making things

D.can be depended on小题3:If you enjoy eating milk chocolate you may ______.

A.look forward to the future

B.like to think of the past

C.enjoy parties and fun

D.have trouble making decisions小题4:From this passage we can say that a helpful man may choose chocolate ______.

A.in oval shape

B.in square shape

C.with nuts

D.with coffee小题5:The last paragraph suggests that the writer ______.

A.believes all the information about chocolate

B.does not believe the information about candy

C.is trying to get you to believe false information

D.doesn’t think it important whether you believe the ideas