问题 实验题

用图所示的装置制取氢气,在塑料隔板上放粗锌粒.漏斗和带支管的试管中装有稀硫酸,若打开弹簧夹。则酸液由漏斗流下,试管中液面上升与锌粒接触,发生反应,产生的氢气由支管导出;若关闭弹簧夹,则试管中液面下降,漏斗中液面上升,酸液与锌粒脱离接触,反应自行停止。需要时再打开弹簧夹,又可以使氢气发生,这是一种仅适用于室温下随制随停的气体发生装置。

 回答下列问题: 

(1)为什么关闭弹簧夹时试管中液面会下降?  

______________________________________________。 

(2)这种制气装置在加入反应物前,怎样检查装置的气密性?

______________________________________________。 

(3)从下面三个反应中选择可以用这种随制随停的制气装置制取的气体,填写下表中的空白。

①大理石与盐酸反应制取CO2  

②硫化亚铁与盐酸反应制取硫化氢  

③用二氧化锰催化分解过氧化氢制氧气

 (4)食盐跟浓硫酸反应制取氯化氢不能用这种装置,试说明理由。

_________________________________________________

答案

(1)关闭弹簧夹,反应产生的气体使试管内液面上的压力增加,所以液面下降。

(2)塞紧橡皮塞,夹紧弹簧夹后,从漏斗注入一定量的水,使漏斗内的水面高于试管内的水面,停止加水后,漏斗中与试管中的液面差保持不再变化,说明装置不漏气

(3)

气体名称

离子方程式

收集方法

检验方法

二氧化碳

CaCO3+2H+==Ca2++CO2↑+H2O向上排空气法

通入澄清石灰水

硫化氢

FeS+2H+==Fe2++H2S↑ 向上排空气法有臭鸡蛋味(或通入硫酸铜溶液)

(4)因为此反应需要加热且食盐是粉末状

阅读理解

Spring is just around the corner and it’s a time to get outside and enjoy the great outdoors. Here is a selection of festivals around the country that are a great excuse to get back in the spring sunshine.

Dana Point Festival of the Whales

Dana Point, California

March 7 to 8 and 14 to 15,2010

Each year, over two sunny weekends in March the town of Dana Point, California celebrates the return of migratory California Gray whales to this part of the Pacific Ocean. Festivities include whale-watching, an arts festival and educational hands-on activities for the entire family. Prices start at $ 29 per adult and $ 19 for children. For more information, visit www.dpfestivalofwhales.com.

Chandler Ostrich Festival

Chandler, Arizona

March 13 to 15, 2010

Chandler is the center of Ostrich(舵鸟) ranching in the U.S. You can see jockeys ride these feathered around the ostrich track at Tubleweed Park. General admission is $9 for adults, $8 for seniors, $7 for children aged five to 12 and kids four and under are free. For more information visit www.ostrichfestival.com.

Festival of Houses and Gardens

Charleston, South Carolina

March 19 to April 18, 2010

The Historic Charleston Foundation gives curious travelers the opportunity to explore gardens of some of the finest private residences in America. Each three hour tour (afternoons from 2 to 5pm and evenings from 6 to 9 pm) lets you visit eight to ten properties dating from the American colonial period. Prices range from $25 to $45. For more information, visit www.historiccharleston.org.

Tulip Time Festival

Holland, Michigan

May 1 to 9, 2010

You don’t need to travel to the Netherlands this spring to see and smell some of the world’s finest tulips(郁金香). The town of Holland is home to millions of colorful bulbs. The 81st annual Tulip Time Festival, one of the largest flower festivals in America will kick off with fireworks on May 1. Admission fee ranges from $6 for the children’s area to $38 for theatre tickets. Tickets and more information are available at www.tuliptime.com.

小题1: A couple with their 4-year-old son will go whale-watching, they have to pay         .

A.$77

B.$ 58

C.$ 38

D.$ 48小题2: The underlined word “jockeys” in the second ad is closest in meaning to         .

A.judges

B.riders

C.children

D.travelers小题3: If you want to learn about the history of American colonial period, you can visit          .

A.Tulip Time

B.Houses and Gardens

C.Dana Point of the whales

D.Chandler Ostrich小题4: It can be concluded that        .

A. All the festivals are held in March.

B. All the Festivals are concerned with animals

C. All the Festivals are held in the U.S.A.

D. All the Festivals surely interest children.

判断题