问题 填空题

根据表中信息回答下列问题。

元素SiPSCl
单质与氢气

反应的条件

高温磷蒸气与氢气能反应加热光照或点燃时发生爆炸而化合
 

(1)S在元素周期表中的位置是       

(2)根据表中信息可知,Si、P、S、Cl 四种元素的的非金属性依次增强。用原子结构解释原因:同周期元素电子层数相同,从左至右,       ,原子半径逐渐减小,得电子能力逐渐增强。

(3)25℃时,以上四种元素的单质与氢气反应生成l mol气态氢化物的反应热如下:

a.+34.3 kJ·mol-1    b.+9.3 kJ·mol-1   c.−20.6 kJ·mol-1    d.−92.3 kJ·mol-1

请写出固态白磷(P4)与H2反应生成气态氢化物的热化学方程式      

(4)探究同主族元素性质的一些共同规律,是学习化学的重要方法之一。已知硒(Se)是人体必需的微量元素,其部分信息如图。

①下列有关说法正确的是       (填字母)。

a. 原子半径:Se>S>P             b. 稳定性:H2Se>H2S

c. 因为酸性H2Se<HCl,所以非金属性Se<Cl

d. SeO2是酸性氧化物,能与烧碱溶液反应

②在下表中列出对H2SeO3各种不同化学性质的推测,举例并写出相应的化学方程式。

编号性质推测化学方程式
1氧化性H2SeO3+4HI=Se↓+2I2+3H2O
2  
3  
 

答案

(1)第3周期VIA(2)核电荷数逐渐增大(或质子数)

(3)P4(s)+6H2(g)=4PH3(g) △H=+37.2 kJ·mol-1

(4)①d

1性质预测化学方程式
2还原性H2SeO3+Cl2+H2O=" " H2SeO4+2HCl
3酸性H2SeO3+2NaOH=Na2 SeO3+2H2O.
 

题目分析:(1)、(2)参见答案;(3)先写出固态白磷(P4)与H2反应生成气态氢化物的化学方程式:P4+6H2=4PH3,通过化学方程式看以看出,1mol P4与H2反应生成4 mol PH3,根据题设条件,当反应生成4 mol PH3时,则反应放出的热量为:4×+9.3 kJ·mol-1=+37.2 kJ·mol-1 ,所以热化学方程式为:

P4(s)+6H2(g)=4PH3(g) △H=+37.2 kJ·mol-1(4)①a.根据同周期和同主族元素原子半径的递变规律,可知正确关系应为:Se>P>S;错误;b.同主族元素气态氢化物的稳定性自上而下依次减弱,正确的应为: H2Se<H2S ,错误;c.应当为最高价氧化物对应的水化物的酸性,即:H2SeO4<HClO4,则非金属性Se<Cl,错误;d.根据同主族元素的性质的相似性,不难得知d正确。

(4)研究H2SeO3的化学性质可从H2SO3的化学性质进行类推,亚硫酸有还原性,能与氯气发生反应,由此可推断H2SeO3也有还原性,化学方程为: H2SeO3+Cl2+H2O= H2SeO4+2HCl;亚硫酸有酸性,能与碱发生反应:则可类推H2SeO3也由此性质,化学方程式为:H2SeO3+2NaOH=Na2 SeO3+2H2O.

填空题
单项选择题

King Richard III was a monster. He poisoned his wife, stole the throne from his two young nephews and ordered them to be smothered in the Tower of London. Richard was a sort of Antichrist the King --"that bottled spider, that poisonous bunchbacked toad. "

Anyway, that was Shakespeare’s version. Shakespeare did what the playwright does: he turned history into a vivid, articulate, organized dream-repeatable nightly. He put the crouch back onstage, and sold tickets.

And who Would say that the real Richard known to family and friends was not identical to Shakespeare’s memorably loathsome creation The actual Richard went dimming into the past and vanished. When all the eye-witnesses are gone, the artist’s imagination begins to twist.

Variations on the King Richard Effect are at work in Oliver Stone’s JFK. Richard III was art, but it was propaganda too. Shakespeare took the details of his plot from Tudor historians who wanted to blacken Richard’s name. Several centuries passed before other historians began to write about Richard’s virtues and suggest that he may have been a victim of Tudor malice and what is the cleverest conspiracy of all: art.

JFK is a long and powerful harangue about the death of the man--Stone keeps calling "the slain young king.’ What are the rules of Stone’s game Is Stone functioning as commercial entertainer Propagandist Documentary filmmaker Historian Journalist Fantasist Sensationalist Crazy conspiracy-monger Lone hero crusading for the truth against a corrupt Establishment Answer: some of the above.

The first superficial effect of JFK is to raise angry little scruples like welts in the conscience. Wouldn’t it be absurd if a generation of younger Americans, with no memory of 1963, were to form their ideas about John Kennedy’s assassination from Oliver Stone’s report of it But worse things have happened--including, perhaps, the Warren Commission report

Stone uses a suspect, mixed art form, and JFK raises the familiar ethical and historical problems of docudrama. But so what Artists have always used public events as raw material, have taken history into their imaginations and transformed it. The fall of Troy vanished into the Iliad. The Battle of Borodino found its most memorable permanence in Tolstoy’s imagining of it in War and Peace.

Especially in a world of insatiable electronic storytelling, real history procreates, endlessly conjuring new versions of itself. Public life has become a metaphysical breeder of fictions. Watergate became an almost continuous television miniseries--although it is interesting that the movie of Woodward and Bernstein’s All The President’s Men stayed close to the known facts and, unlike JFK, did not validate dark conjecture.

Which of the following can best describe the author’s comments on Stone’s organization of plots()

A. Bewildering

B. Superficial

C. Contradictory

D. Intricate