问题 判断题

(8分)有一包粉末状的混合物,可能含有MgCl2、FeCl3、NaOH、CuSO4、Al2(SO4)3、KNO3、CaCO3、NaCl中的两种或多种。将混合物置于水中搅拌,得无色透明溶液;再将所得无色透明溶液分为两份:一份中通入CO2,有白色沉淀出现,滴入稀盐酸沉淀消失;另一份中加入BaCl2溶液,同样有白色沉淀出现,此沉淀不溶于稀硝酸。完成下列问题:

(1)原混合物中肯定含有的物质是____________(写化学式)

(2)混合物置于水中,所得无色透明溶液中一定含有的物质是______________(写化学式)。

(3)常温下所得无色透明溶液的pH7(填“>”或“<”)。

(4)在所得无色透明溶液中有关离子方程式为___________________________________

答案

(1)NaOH、Al2(SO4)3 (2)NaAlO2、Na2SO4(3)>(4)====

向所得澄清溶液中通入CO2产生白色沉淀,所以原粉末中含有铝离子,加入BaCl2产生白色沉淀,说明其中含有硫酸根离子,所以原固体粉末中含有氢氧化钠和硫酸铝。

单项选择题 共用题干题
阅读理解

请阅读下面几种假日集训班的信息:

A. You’ll spend half of each day learning different types of dance. The teachers will give you lots of tips and advice as well as help you find your own dance style to impress your friends.

B. This course is for those who are interested in making films. You and your group will be able to choose what type of film to make. You’ll become a film crew(全体人员) and create your own film ready to show to everyone else. What’s more, you’ll have your film on DVD to take home with you, too!

C. Football players at this club will experience fun and dynamic training, which aims to improve their all-round football skills. It doesn’t matter how good you are as we will normally try and put you in a group with others of a similar level.

D. Our Learner Driver holiday means that when it comes to having lessons and taking your test, you will be well ahead of the crowd. You’ll experience 30 minutes of driving each day as will as theory.

E. Our coaches will make sure you cover all the surfing basics (基础). Before you know it you’ll be getting up and riding. We promise you’ll never forget the feeling you get when you catch your first wave!

F. We will show you how to create music of different styles and then record your own professional quality tracks (录音) on CDs to take home for your friends and listen to. You don’t even need to be able to play an instrument or have any musical knowledge to get involved.

请阅读下面人物信息,并为他们选择合适的项目:

小题1:Mary lives far away from her office, and it takes her long time to get there every day. Recently, she has been thinking about buying a car, but she wants to get training before she buys it.

小题2:Laura loves music very much. She often says that she cannot be separated from her iPod. Although she doesn’t know how to play an instrument, she wants to create her own music.

小题3:Louis is a middle school student; he likes to spend his spare time on the playground. He used to watch others play football because he is not very good at it. He wants to attend a training course to improve his skills.

小题4:Wang Ling is a college student who likes to dance. She wants to take part in a party next week, so she wants to learn some new moves to try out on the dance floor.

小题5:Star is a freshman. He is an English Major, but he likes photography very much. He and his roommates often go out to take photos. They plan to go on an outing during the summer holiday to make their own film.