问题 填空题

A、B、C、D、E是五种原子序数依次增大的短周期元素,B是地壳中含量最多的元素.已知A、C及B、E分别是同主族元素,且B、E两元素原子核内质子数之和是A、C两元素原子核内质子数之和的2倍.处于同周期的C、D、E元素中,D是该周期金属元素中金属性最弱的元素.

(1)A、B、C形成的化合物的电子式为______;

(2)一点温度下,浓度相同的B、C、D组成的化合物的水溶液与A、C、E组成的化合物的水溶液的pH______>______(填化学式)

(3)D与C元素最高价氧化物对应水化物反应的离子方程式______

(4)写出两种均含A、B、C、E四种元素的化合物在溶液中相互反应、且生成气体的离子方程式______

(5)A单质和B单质能构成电池,该电池用多孔惰性电极浸入浓KOH溶液,两极分别通入A单质和B单质,电池的负极通入的是______气体,电极反应式______;

(6)通常条件下,C的最高价氧化物对应水化物2mol与E最高价氧化物对应水化物1mol的稀溶液间反应放出的热量为114.6kJ,试写出表示该热量变化的离子方程式______.

答案

(1)A为H,B为O,C为Na,D为Al,E为S,A、B、C形成的化合物为氢氧化钠,电子式为

,故答案为:

(2)B、C、D组成的化合物为NaAlO2,A、C、E组成的化合物为NaHS,氢氧化铝为两性氢氧化物,硫化氢为弱酸,故酸性硫化氢大于氢氧化铝,故浓度相同两种混合物水解时,碱性NaAlO2>NaHS,故答案为:NaAlO2>NaHS;

(3)C元素最高价氧化物对应水化物为氢氧化钠,D为Al,故反应的离子方程式为2Al+2OH-+2H2O=2AlO2-+3H2↑,

故答案为:2Al+2OH-+2H2O=2AlO2-+3H2↑;

(4)A、B、C、E四种元素的化合物在溶液中相互反应、且生成气体,可以为硫酸氢钠与亚硫酸氢钠的反应,离子方程式如下H++HSO3-=SO2↑+H2O,

故答案为:H++HSO3-=SO2↑+H2O;

(5)氢气和氧气组成的燃料电池,负极为氢气,电极反应为H2+2OH--2e-=2H2O,故答案为:氢气;H2+2OH--2e-=2H2O;

(6)C的最高价氧化物对应水化物为氢氧化钠2mol与E最高价氧化物对应水化物硫酸1mol的稀溶液,反应的实质为氢离子和氢氧根离子反应,故热化学方程式为H+(aq)+OH-(aq)=H2O(l)△H=-57.3kJ/mol,故答案为:H+(aq)+OH-(aq)=H2O(l)△H=-57.3kJ/mol.

填空题

Part 4


Questions 26-45


·Read the following article and choose the best word for each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.

iPhone Left in Hot Car for Three Hours


The normally peaceful suburban town of Winnetka is still reeling following the news Monday (26) a local resident, whose name is being (27) by police pending a full investigation, left an iPhone unattended for more than three hours in a car (28) in the hot sun.
"Responding to calls from (29) . passersby, who observed the iPhone sitting in a vehicle in the parking (30) of the Westfield Shopping Center, police arrived on the (31) at approximately 4 p.m. and immediately intervened to save the device," said Winnetka police chief Douglas Blaine. "Security cameras have shown that the iPhone had been in the car— with the doors (32) and the windows rolled (33) —since 1 p.m. Due to the tragic and highly emotional (34) of this case, we cannot say any (35) at this time."
According to official police records, two officers forcibly (36) into the car at 4:07 p.m. and found the iPhone (37) face down on the dashboard. The iPhone at first showed no (38) of life, but after a tense few seconds, officers were able to wake it and get it to (39) to a series of simple touch commands. Police said that if the iPhone were left in the extreme (40) for any longer, it could have died.
The iPhone was rushed by ambulance to a nearby Apple facility for careful (41) .Miraculously, no damage to its memory, screen, or wireless capabilities was reported.
Upper-middle-class suburbanites from all over the North Shore area have reacted to the near-tragedy with an unprecedented outpouring of (42) . Hundreds of cards and letters have come streaming in, and local talk radio shows have been flooded (43) calls demanding that the iPhone’s (44) be prosecuted. Many have come forward offering to take the iPhone into their custody, and still (45) have donated free downloads, ringtones, and MP3s to the victimized object.

A.parked

B.driven

C.sold

D.washed

多项选择题 案例分析题