问题 实验题

(9分)甲、乙、丙三位同学分别用如下三套实验装置及化学药品(其中碱石灰为固体氢氧化钠和生石灰的混合物)制取氨气。请你参与探究,并回答下列问题:

(1)三位同学制取氨气的化学方程式为: _____         __________________________。

(2)三位同学都用向下排空气法收集氨气,其原因是_______________________________.

(3)三位同学用上述装置制取氨气时,其中有一位同学没有收集到氨(如果他们的实验操作都正确),你认为没有收集到氨气的同学是___________填(“甲”、“乙”或“丙”),收集不到氨气的主要原因是_____________________________________(用化学方程式表示)。

(4)检验氨气是否收集满的方法是(简述操作方法、现象和结论)____________________

_____________________________________________________________________________。

(5)三位同学都认为他们的实验装置也可用于加热碳酸氢铵固体制取纯净的氨气,你判断能够达到实验目的的是___________(填“甲”、“乙”或“丙”),该装置中的NH4HCO3固体能否用NH4Cl固体代替制NH3?______________(填“能”或“不能”)。

答案

(1)2NH4Cl+Ca(OH)2=2NH3↑+2H2O+CaCl22分

(2)氨气的密度比空气的小1分。

(3)乙1分,2NH3+H2SO4=(NH4)2SO42分

(4) 用湿润的红色石蕊试纸置于试管口,如果试纸变蓝则氨气已满1分。

(5)丙1分,不能1分

阅读理解

We Love Gadgets(小配件)

If you love the latest gadgets or you want to be the next James Bond, come to Gadgets in the Garden Shopping Mall.

Gadgets is a cool new shop. It sells all the latest gadgets and toys from MP3 players and cameras phones to toy robots. It's a great place to go to check out the latest things.

Jon Lee and his best friend Tom Green own Gadgets. They love gadgets and toys very much. They are already running a successful Internet shop but want to give their customers a chance to play with all the latest gadgets before they buy.

Jon says, "Tom and I are always buying the latest gadgets. We love new ideas and we know that our customers love them too." They both think their new shop will be a big success and we think so too!

Gadgets opens at 9 0'clock on Wednesday August 1st, 2012. John and Tom are planning a fantastic opening. Don't miss it.

小题1: Where is Gadgets?

A.It's in a supermarket.

B.It's in a shopping mall.

C.It's in a garden.

D.It's on the Internet.小题2:What doesn't the cool new shop sell?

A.Toy robots.

B.MP3 players.

C.Camera phones.

D.ties.小题3:Who will probably (可能) to the new shop and buy things?

A.James Bond.

B.Jon Lee.

C.People who love the latest gadgets.

D.Tom Green.小题4:Why do Jon Lee and Tom Green open the new shop?

A.Because they want to make some money,

B.Because their Internet shop isn't successful.

C.Because they want to buy more gadgets.

D.Because they hope their customers can play with gadgets before they buy.

选择题