问题 填空题

请填表,并根据下表回答有关问题.[除第(2)小题外,其余均用序号填写]

序号
物质高锰酸钾熟石灰二氧化碳
化学式FeSO4
(1)上表中的物质属于氧化物的是______.

(2)用表中的物质作为反应物,写出符合下列要求的化学方程式:

①实验室制取氧气______;

②实验室检验④______.

(3)表中含-1价原子团的物质为______.

答案

由FeSO4可知该化学式中含有硫酸根,铁为+2价铁,故命名为硫酸亚铁;高锰酸钾的化学式为KMnO4

熟石灰是氢氧化钙的俗名,化学式为Ca(OH)2.二氧化碳的化学式为CO2

(1)二氧化碳中只含一种成分,只含碳、氧两种元素,且其中一种是氧元素,因此二氧化碳属于氧化物.

(2)①实验室制取氧气可用加热高锰酸钾的方法,化学方程式为:2KMnO4

  △  
.
 
K2MnO4+MnO2+O2↑;

②实验室检验二氧化碳可用石灰水,即氢氧化钙的水溶液,反应的化学方程式为:CO2+Ca(OH)2═CaCO3↓+H2O.

(3)高锰酸钾中含有高锰酸根是-1价的原子团,氢氧化钙中含有的氢氧根原子团是-1价的原子团.

故答案为:

序号
物质硫酸亚铁
化学式KMnO4Ca(OH)2CO2
(1)④

(2)①2KMnO4

  △  
.
 
K2MnO4+MnO2+O2

②CO2+Ca(OH)2═CaCO3↓+H2O

(3)②③

阅读理解

阅读理解诶。

     Reading to dogs is an unusual way to help children improve their literacy skills (读写能力). With their

shining brown eyes, wagging tails, and unconditional love, dogs can provide the non-judgmental listeners

needed for a beginning reader to gain confidence (自信心), according to Intermountain Therapy Animals

(ITA) in Salt Lake City. The group says it is the first program in the country to use dogs to help develop

literacy in children, with the introduction of Reading Education Assistance Dogs (READ).

     The Salt Lake City Public Library is sold on the idea. "Literacy specialists admit that children who read

below the level of their fellow pupils are often afraid of reading aloud in a group, often have lower self-

respect, and regard reading as a headache," said Lisa Myton, manager of the children's department.

     Last November the two groups started "Dog Day Afternoon in the children's department of the main

library. About 25 children attended each of the four Saturday-afternoon classes, reading for half an hour.

Those who attended three of the four classes received a "pawgraphed" book at the last class.

     The program was so successful that the library plans to repeat it in April. According to Dana Thumpowsky,

public relations manager.

1. What is mainly discussed in the text?

A. Children's reading difficulties.

B. Advantages of raising dogs.

C. Service in a public library.

D. A special reading program.

2. Specialists use dogs to listen to children reading because they think _____.

A. dogs are young children's best friends

B. children can play with dogs while reading

C. dogs can provide encouragement for shy children

D. children and dogs understand each other

3. By saying "The Salt Lake City Public Library is sold on the idea", the writer means the library _____.

A. uses dogs to attract children

B. accepts the idea put forward by ITA

C. has opened a children's department

D. has decided to train some dogs

4. A "pawgraphed" book is most probably _____.

A. a book used in Saturday classes

B. a book written by the children

C. a prize for the children

D. a gift from parents

单项选择题