问题 填空题

(5分)钠的化合物在日常生活中应用广泛。

(1)在元素周期表中,钠元素的信息如图所示,钠元素的相对原子质量为_____。

(2)氢氧化钠可用于制杀虫剂,氢氧化钠的俗名是_____(写一种)。

(3)次氯酸钠(NaClO)是84消毒液的有效成分,次氯酸钠中氯元素的化合价为_____。

(4)碳酸氢钠是发酵粉的主要成分,碳酸氢钠与盐酸反应的化学方程式为_________。

(5)氨基钠(NaNH2)是合成维生素A的原料。工业上生产氨基钠的化学反应方程式为

2Na + 2NH32NaNH2 + H2↑,该反应属于基本反应类型中的_______反应。

答案

(1)22.99   (2)火碱(烧碱、苛性钠)     (3)+1

(4)NaHCO3 + HCl     NaCl+ H2O + CO2↑   (5)置换

题目分析:(1)根据元素周期表方格中的信息,可知钠元素的相对原子质量为22.99

(2)氢氧化钠具有强烈的腐蚀性,俗称:火碱(烧碱、苛性钠)

(3)根据化合价的一般规律:在化合物中,正负化合价的代数和为0,次氯酸钠(NaClO)中Na的化合价为+1,O的化合价为-2,所以氯元素的化合价为+1

(4)碳酸氢钠与盐酸反应的化学方程式为:NaHCO3 + HCl     NaCl+ H2O + CO2

(5)化学反应方程式为2Na + 2NH32NaNH2 + H2↑,符合一种单质和一种化合物反应生成另一种单质和另一种化合物的特点,属于置换反应

阅读理解

From:Li-Hong @ net. cn
To:jenny@compail.ca
Subject:School term
Date:01/09 6:00 p.m.
Dear Jenny,
Today is my first day of new high school.Many students in our school come from big cities.They bring the high-tech things to school,for example,mobile phones,MP3 players,CD players and electronic dictionaries.They show off these things to others.What about your classmates in the US? Do they have these things?
Li Hong
From:jenny@compail.ca
To:Li-Hong @ net. cn
Subject:Repeat!
Date:01/09 8:00 p.m.
Dear Li Hong.
We also bring these high-tech things when we are back to school.However,we often work during the holidays,and make money to buy these things.I think we need these things.We need mobile phones to contact with our friends.We also need CD players to listen to music.Electronic dictionaries can be useful for our study too.
Jenny
 
小题1:The word “high-tech” means ____________ in Chinese.
A.高质量的B.高品质的C.高科技的D.高价格的
小题2:Where do you probably read these two letters?
A.In a magazine.B.In a book.C.In a guide-book.D.On a website.
小题3: Li Hong thinks many students like to bring the high-tech things to school because ____________.
A.they like to listen to music
B.mobile phones are useful for their studies
C.they want to show off these things
D.they want to contact with their classmates
小题4:Jenny thinks students bring CD players to school because they want to _________.
A.make money B.contact with friends C.listen to musicD.study well
小题5:From the passage we know that ____________.
A.Li Hong has many high-tech things like her classmates
B.American students often use their own money to buy the high-tech things
C.Chinese students work during the holidays to buy the high-tech things
D.all the high-tech things are useful for the students
单项选择题