问题 实验题

(4分)用酸式滴定管准确移取25.00mL某未知浓度的盐酸溶于一洁净的锥形瓶中,然后用0.20mol·L -1的氢氧化钠溶液(指示剂为酚酞).滴定结果如下:

 NaOH起始读数NaOH终点读数
第一次      0.10mL    18.60mL
第二次      0.30mL    18.00mL
(1)根据以上数据可以计算出盐酸的物质的量浓度为            mol·L-1.

(2)达到滴定终点的标志是                                                      

答案

(4分)(1)0.1448 mol/L  (2)无色变粉红色且30s不变色

题目分析:(1)根据表中数据可知,两次消耗的氢氧化钠溶液体积分别是18.50ml和17.70ml,其平均值是18.10ml,所以盐酸的物质的量浓度是

(2)由于酸不能使酚酞试液变色,而碱能使酚酞试液变红色,所以达到滴定终点的标志是无色变粉红色且30s不变色。

点评:由于一次实验误差太大,所以在进行中和滴定的有关计算时,应该要重复实验2~3次,然后取平均值即可。

阅读理解

Still seeking a destination for your long summer holidays? There is a good place which may be your favorite option.

Arts of Hope is an overnight performing arts summer camp in Saint Paul, Minnesota, the USA for kids aged 10 and older from around the world. More than just a performing arts camp, Arts of Hope offers participants a unique opportunity to live with kids from other cultures while learning and performing music from many countries.

Each summer, up to 75 children venture to Minnesota from Europe, Asia, Africa, Latin America, the Middle East, and the US. They arrive as strangers but soon become friends as they learn popular songs and dances from each other’s cultures. The lessons learned during these six weeks are profound. The friendships are enduring. And the stories are inspirational. Taking part in the Arts of Hope camp is a life-changing experience.

DATES

The Arts of Hope 2013 session will run from June 17 to July 30. Because Arts of Hope is a global camp, it is impossible for us to schedule the program to fit all the school schedules of all the schools in the world. Therefore, we understand that some participants may need to arrive late or leave early. Don’t let that stop you from applying! We are happy to make special arrangements as needed. Just send us an email to explain your scheduling challenges. We are happy to arrange a special study room for late arrivals to make up for the missed lessons.

PARTICIPANT FEE

For the 2013 summer, the fee for new, first-time participants is $2,950, subject to the special discounts offered below.

SPECIAL DISCOUNTS

If you apply before February 28, you can get a special fee reduction of $100. Also, there is a 20% fee discount for additional participants from your family if you have a brother or sister who is a Arts of Hope participant. The discount applies to the second, third, and any other additional siblings attending in the same year from the same family.

Apply early to assure your place! Please sign up now!

小题1: Which of the following statement is not true?

A.The camp will last more than one month.

B.The discount applies to the third sibling from the same family.

C.Kids can learn more about different cultures.

D.You’d better sign up for the camp early.小题2:If you leave early or arrive late, what will happen ?

A.They will make up for the missed lessons.

B.You will have to attend the next year’s camp.

C.They will give you a special discount.

D.You will have to miss some lessons.小题3: If you and your sister apply for the first time on May 16, how much will both of you pay in total?

A.$4,720

B.$5,310

C.$5,900

D.$5,700

阅读理解与欣赏
课内阅读。
假如生活欺骗了你,
不要悲伤,不要心急!
忧郁的日子里需要镇静:
相信吧!快乐的日子将会来临。
心儿永远向往着未来;
现今却常是忧郁。
一切都是瞬息,
一切都将会过去;
而那过去了的,
就会成为亲切的怀恋
1、选出下列说法正确的一项(  )
A、在《假如生活欺骗了你》第二节中,体现了作者向往未来,坚信未来是光明的信心。 B、《假如生活欺骗了你》既是诗人对心爱的孩子的叮咛嘱托,同时也是勉励自己的座右铭。
C、诗人普希金通过想象,展示了未来美好生活的图景,鼓励人们克服眼前的困难,增强生活的信心。
D、《假如生活欺骗了你》是一首蕴含哲理的政治抒情诗。
2、按要求默写:
  写出《假如生活欺骗了你》一诗中,表达了诗人对美好未来的热烈向往与追求、勇于面对现实、拥抱苦难的诗句。
________________________________________________________
3、《假如生活欺骗了你》这首诗成为脍炙人口的名篇,对其原因分析不正确的一项是(  )
A、这首诗告诉了人们要勇敢地面对人生坎坷,要对未来充满希望。
B、全诗表达了诗人坚定信心:忧郁的日子终将会过去,幸福就要来临!
C、读完此诗,宛如聆听一位长者对于心爱的孩子的叮咛和嘱托。
D、这首诗是用劝说的口吻,直接告诉人们人生的哲理。
4、“生活欺骗了你”并非单指上当受骗,而是指什么?
________________________________________________________ 
5、说说你对画线诗句的理解。
________________________________________________________
6、为什么被“生活欺骗”了,还“不要悲伤,不要心急”?
________________________________________________________
7、普希金在写作本诗时,正被沙皇流放,过着充满艰辛的流放生活,精神的压抑曾使诗人产生前程渺茫、壮志难酬的伤感。你从诗中还能体会出这种感伤之情吗?为什么?
________________________________________________________
8、诗人通过本诗告诫我们:_____________________________________________________