问题 选择题

下图是两套实验室制气装置(省去了铁架台和锥形瓶中的药品)用于发生、干燥和收集气体,下列选项中正确的是

      

图1                 图2

A二氧化锰和浓盐酸应选用图1装置
B浓盐酸和浓硫酸图1和图2装置均不能选用
C生石灰和浓氨水应选用图2装置
D过氧化钠和水应选用图2装置

答案

答案:C

实验室中若用MnO2和浓盐酸来制备Cl2,由于MnO2的氧化性不是很强,因此在反应过程中必须加热,由此可知既不能选用图1也不能选用图2来制备Cl2。若用Na2O2和水反应来制备O2,考虑到O2的密度比空气大,应采用向上排空气法或用排水法收集,因此不应选用图2来制备。

多项选择题
阅读理解

阅读理解

     Do you enjoy reading? Here readers of your age from all over the United States recommend (推荐)

great books for you to read:

     My favorite book is Don't Die, My Love by Lurlene McDaniel. I love all her books, but this was the

first one I read and I have to say, it is by far my favorite. It doesn't end like other books, and I cried while reading.

     I think Nancy Drew is great! Nancy is a detective (侦探) who has many fantastic ideas! I love it

because it's a book from when my grandma was my age, and I can share the fun with her!

     I highly recommend Skinny Bones by Barbara Park. It is funny so please add it on your book list.

You don't want to miss out funny stories!

     I would suggest ______ by Judy Blume. It is based on real things that happened to Judy Blume. It is

about a girl, Alice, who meets some girls at a new state. They become friends, make a club and meet

once a week. They stop after two weeks because they all like a boy in their class and put him as number

one. I think every girl should read this because it is about our growing up.

     I read a book called Neela: Victory Song and it was so good I read it twice! It takes place in India

in 1936 and this 12-year-old girl named Neela tries to save her father! It has lots of history in it! I also

learned a lot about different cultures! The author's name is Chitra Banerjee Divakaruni.

1. According to the reader, Skinny Bones can be described as a ________ story.

A. sad

B. history

C. funny

D. detective

2. From which book can we learn different cultures?

A. Skinny Bones.

B. Nancy Drew.

C. Don't Die, My Love.

D. Neela: Victory Song.

3. The best name of the 4th book is ________.

A. My Secret

B. Growing Trouble

C. Three Friends

D. Alice Learns a Lesson

4. Which is TRUE about Nancy Drew?

A. It doesn't have a common ending like other books.

B. It's based on real things that happened to the author.

C. It's about a12-year-old girl who tries to save her father.

D. Both the reader and the reader's grandma love this book.