问题 实验题

(11分)某化学兴趣小组的同学设计了一套实验方案探究元素周期表中元素性质的变化规律:1、同一周期内从左到右元素金属性的递变规律;

2、同一主族内从上到下元素非金属性的递变规律。

实验方法(Ⅰ)实验现象(Ⅱ)
1.钠与冷水反应,再向反应后溶液中滴加酚酞。A.产生白烟
2.向新制的H2S饱和溶液中滴加新制的氯水B.反应不十分剧烈,产生的气体能燃烧,溶液变成浅红色。与酸反应剧烈,产生大量气泡且可以燃烧
3.镁带用砂纸打磨后在空气中燃烧C.产生大量气泡、气体可以燃烧
4.NaI溶液中加入溴水和CCl4D.下层溶液变橙色
5.镁带用砂纸打磨后与沸水反应,再向反应后溶液中滴加酚酞。镁带用砂纸打磨后与2mol/L盐酸反应。E.浮于水面,熔成小球,迅速向四处游动,溶液变成红色
6.蘸浓氨水与浓盐酸的两玻璃棒接近F.下层溶液变紫色
7.NaBr溶液中加入氯水和CCl4G.发出耀眼的强光,生成白色物质
8.铝片用砂纸打磨后与2mol/L盐酸反应H.生成淡黄色沉淀
回答下列问题:

(1) 从上表(Ⅰ)中选择实验方法,从(Ⅱ)中选择相应的实验现象,上下对应地填写符合要求的答案在空格中(有几个填几个,不一定把空格填满)。

 探究同一周期从左到右元素金属性的递变规律探究同一主族内从上到下元素非金属性的递变规律
        
        
(2)实验结论(用元素符号表示具体的强弱顺序):

元素的金属性:                     ,元素的非金属性:               

(3)上表(Ⅰ)中实验方法8反应的离子方程式                                   

(4)上表(Ⅱ)中实验现象D反应的离子方程式                                              

答案

(1)(上下必须对应才得1分,共5分)

 探究同一周期从左到右元素金属性的递变规律探究同一主族内从上到下元素非金属性的递变规律
158 47  
EBC FD  
(2)   Na>Mg>Al  (1分)     Cl>Br>I  (1分)

(3)  2Al+ 6H= 2Al3++3H2↑ (2分) 

(4)  Cl+ 2Br- = 2Cl- + Br2  (2分)

考查元素周期律的应用。根据元素周期律可知,同主族自上而下金属性逐渐增强,非金属性逐渐减弱。同主族自左向右金属性逐渐减弱,非金属性逐渐增强。金属性越强和水或酸的反应就越容易,反应就越剧烈。非金属性强能把弱的从其盐溶液中中置换出来。

选择题
阅读理解

For Chinese wanting to work as nurses in the United Sates, the arrival of the test of the Commission on Graduates of Foreign Nursing Schools (CGFNS) may be a welcome move.

The CGFNS has a certification programme for people wanting to work as registered nurses in the US. The first CGFNS test in China is to be held in Beijing in July. Registrations is open till April 9. According to US labour law, nurses have to pass the National Council License Examination for Registered Nurses (NCLEX-RN) before they can practise. However, the NCLEX-RN is only useful in the US, making it difficult for people from other countries to get in. But, the US expects a shortage of 50,000 nurses by 2010. So, the CGFNS has not replaced the NCLEX-RN, which is still needed for work as a registered nurse in the US.

So what exactly does CGFNS do?

First of all, it helps international nurses qualify for a work visa for the US. Nurses educated abroad who do not have a US license by the NCLEX-RN, must get the CGFNS certificate. “But not everyone who gets a CGFNS certificate can get a work visa. There are many requirements for a visa, and the CGFNS is just one,” said John Ratigan, immigration officer for the CGFNS.

The certificate helps applicants meet requirements for the NCLEX-RN. Forty-two states require a CGFNS certificate from nurses educated abroad before taking the NCLEX-RN examination.

About 85 percent of those who passed the CGFNS have passed the NCLEX-RN. According to Barbara Michols, chief executive officer of CGFNS, “the CGFNS is cost-efficient for the Chinese. If they can’t pass the CGFNS here in China, their chances of passing the NCLEX-RN for the US are tiny. This saves time and money on visa applications and the long trip. ” In a word, to get a CGFNS certificate, a person must have: a credentials review, the CGFNS qualifying exam of nursing knowledge and an English language proficiency exam.

小题1:   We can infer from the text that to people hoping to work as registered nurses in the US, CGFNS tests can be taken _____.

A.nowhere but in the US

B.somewhere outside the US

C.in every country but the US

D.both in China and the US小题2: According to American labour law, people cannot work as nurses until they pass                   _____.

A.NCLEX-RN

B.CGFNS

C.CGFNS and NCLEX-RN

D.CGFNS or NCLEX-RN小题3:We can learn from the text that _____.

A.if you get a CGFNS certificate, you can pass the NCLEX-RN in the US and get visa

applications

B.if you pass the NCLEX-RN in the US, you can get a CGFNS certificate and get visa

applications

C.if you can't pass the NCLEX-RN in the US, you will not be able to pass the CGFNS

examination

D.if you get a CGFNS certificate, you will be more likely to pass the NCLEX-RN examination小题4:The sentence "CGFNS holders have a higher rate of success on the NCLEX-RN examination" can be arranged at the beginning of Paragraph _____.

A.Two

B.Four

C.Five

D.Six小题5:What is probably the best title of this passage?

A.The CGFNS helps international nurses

B.The first CGFNS test in China

C.The CGFNS and the NCLEX-RN

D.Working as registered nurses in the US