82615205
A. covers B.
writes C.
prints D.
reads
24. If your
race car isn’t insured, you may losing
everything when it hits something solid.
A. delay B.
deny C.
avoid D.
risk
25. The coach
asked his staff to
the large group of journalists waiting for him to announce his
training plans.
A. adapt to B.
attend to C.
refer to D.
appeal to
26. London, the city that will
host the 2012 Summer Games,
an eight-minute show featuring football star David Beckham.
A. rely on B.
put on C.
concentrate on D.
feed on
27. Some miners
were trapped when the local mine was flooded, but luckily, 400 kilograms of
milk
to them during the rescue.
A. got
through B.
brought down C.
gave away D.
gave out
28. Credit
cards give their owners automatic credit in stores, restaurants, and hotels, at
home, and even abroad, and they make many banking services
as well.
A. sustainable B.
available C.
reliable D.
valuable
29. Although
the country has had political independence for over a century,
it needs the support of its neighbors.
A. naturally B.
economically C.
especially D.
luckily
30. The
superstar can be very sad
, though in public he is extremely cheerful.
A. by
chance B.
in person C.
in private D.
as individual
第二节
完成句子(共10小题;每小题1.5分,满分15分)
阅读下列各小题,根据括号内的汉语提示,用句末括号内的英语单词完成句子。
31. ―Tom, your hair is too long. Go to
the barber’s and
(把头发剪短).(cut)
―OK, Mum. I’ll do it after school.
32. Never
(他到过)any other
city in China except Beijing. (be)
33. (最著名的两所大学)in Britain are Oxford
University and Cambridge University.(famous)
34. How I wish
(我没有浪费)so much
time playing computer games when I should have studied. (waste)
35. The factory
(他曾经工作过的)is in
danger of closing down because of poor management. (work)
36. I hate being away
from my parents, so I can’t decide
(是否要去日本工作).(whether)
37. Road accidents
have become much fewer in the past few years. The government must
(采取了有效措施).(take)
38. To avoid
(烫伤), you have
to be careful enough when you are cooking. (burn)
39. I can hardly fall
asleep because of the loud noise outside. A new shopping center (正在建设)nearby. (build)
40. The student wasn’t
paying attention in class,
(眼睛盯着)the tree
in front of the classroom. (fix)
第二节 完型填空(共20小题;每小题1.5分,满分30分)
阅读下面短文,掌握其大意,然后从41―60各题所给的四个选项(A、B、C和D)中,选出最佳选项。
An earthquake hit Kashmir on Oct. 8, 2005. It took some 75,000 lives, 41 130,000 and left nearly 3.5 million
without food, jobs or homes.
42 overnight, scores of
tent villages went up across the 43 with the help of international aid 44 , military personnel(人员)and aid groups working day and
night to shelter the survivors before winter set 45
.
Mercifully, the
season was mild. But with the
46 of spring, the
survivors will be moved again. Camps that 47
health care, food and shelter for 150,000 survivors have begun to
close as they were 48 intended to be permanent.
For most of the
survivors, the thought of going back brings 49
emotions. The past six months have been difficult. Families of 50 many as 10 people have had to
shelter in a single 51 and share cook stoves and bathing 52
with neighbors. “They are looking forward to the clean water of
their rivers,” officials say. “They are 53 of free fresh fruit. They want to
get back to their fields and start 54 again.” But most will be returning
to 55 but piles of ruins. In many
villages, electrical 56 have not been repaired, nor have
roads. Aid workers 57 that it will take years to rebuild
what the earthquake 58 away. And for the thousands of
survivors, the 59 will never be complete.
Yet the survivors
have to start somewhere. New homes can
be 60 from the stones, bricks and beams(梁)of old ones. Spring is coming and
it is a good time to start again.
41. A. injured B.
ruined C.
destroyed D.
damaged
42. A. Altogether B.
Almost C.
Scarcely D.
Surely
43. A. position B.
construction C.
location D.
region
44. A. ranks B.
equipment C.
organizations D.
arms
45. A. out B.
in C.
up D.
off
46. A. falling B.
leaving C.
coming D.
appearing
47. A. strengthened B.
aided C.
transferred D.
provided
48. A. never B.
once C.
ever D.
yet
49. A. puzzled B.
disappointed C.
doubled D.
mixed
50. A. like B.
as C.
so D.
too
51. A. room B.
bed C.
tent D.
umbrella
52. A. facilities B.
instruments C.
tools D.
furniture
53. A. seeking B.
dreaming C.
longing D.
searching
54. A. producing B.
harvesting C.
farming D.
living
55. A. anything B.
something C.
everything D.
nothing
56. A. lines B.
channels C.
paths D.
currents
57. A. account B.
measure C.
think D.
guarantee
58. A. went B.
took C.
gave D.
put
59. A. reform B.
recreation C.
replacement D.
recovery
60. A. built B.
pulled C.
surrounded D.
removed
第三部分:阅读理解(共20小题,每题2分,满分40分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
A
A federal judge sentenced Bruce Jones to 12 years in federal prison
for fraud(诈骗罪). Over a
10-year period, Jones had managed to cheat thousands of people throughout the
state out of almost $10 million.
He advertised his fantastic ideas on TV. “For some reason,” Jones
said, “TV seems to break the ice. Even though you are a total stranger to the
viewer, once he sees you on TV in his home, he feels like he knows you. You
enter his living room and become a trusted friend.”
Jones had an imagination that wouldn’t quit. One time he showed
viewers an “official government” earthquake report which “proved” that the
western half of California
would collapse into the sea within three years. For $100, he said, Jones would
insure(承保) your
house and property for full value. Thousands of people who saw that TV ad sent
him a hundred dollars each.
In another TV ad, Jones claimed that he had come to an agreement
with the federal and state government for exclusive(独享的)air rights. He told viewers
that, for only $100, they could own the first 10 miles above all their
property. You would be able to charge any commercial plane that flew over your
property $100 per crossing. You would also be able to charge government rockets,
satellites, space shuttles, and space stations $100 for each and every
violation of your air rights.
Another time, Jones claimed to have invented a product that gets rid
of calories. He showed the viewers a spray can of “NoCal.” He said that by
simply spraying NoCal on your food, a chemical interaction would cause all the
calories in the food to simply disappear within about 10 seconds. The NoCal was
only $10 a can. As usual,
Jones received thousands of checks in the mail.
The judge told Jones that he should be ashamed of himself. Jones
responded that he was very ashamed of himself, and that when he got out of
prison he hoped to become a TV adviser to help people avoid getting cheated. He
told the judge that he was already developing an instructional CD that, for
merely $100, would save people thousands of dollars in scams(骗局). The judge nodded, and then
changed Jones’ sentence from 10 years to 12 years.
61. According
to Jones, he could successfully cheat many people mainly because
.
A. he
promised them a large profit
B. they
were too eager to make money
C. they
believed too much in TV ads
D. he was
skillful in communicating with people
62. Which of
the following statements is TRUE?
A. Jones
showed unusual imagination in his tricks.
B. Jones
was closely related to the state government.
C. Western California was in danger of going under the sea.
D. Jones
felt guilty and was determined to lead a new life.
63. We can
infer that people who wanted to buy “NoCal” from Jones
.
A.
were mainly from low income families
B. all had
a rich knowledge of chemistry
C. were
probably interested in losing weight
D. usually
did the shopping through the Internet
64. The judge
changed the sentence at last because
.
A. Jones
was planning another big scam
B. he could
hardly believe what Jones had told him
C. Jones
had cheated more people than he expected
D. he had
suffered from Jones’ scams himself
B
Icebergs are among
nature’s most impressive creations, and yet most people have never seen one.
They come into being somewhere in faraway, freezing waters, amid thunderous
noise and splashing turbulence(漩涡), which in most cases no one hears or sees. They exist only a short
time and then slowly melt away just as unnoticed.
They have been called objects of
complete beauty. Appearing in an endless variety of shapes, they may be dazzlingly
white, or they may be glassy blue, green or purple, in light colors or in dark
colors. They are graceful, stately, inspiring-in calm, sunlit seas.
But they are also
called frightening and dangerous, and that they are-in the night, in the fog,
and in storms. Even in clear weather one is wise to stay a safe distance away
from them. Most of their main part is hidden below the water, so their
underwater parts may extend out far beyond the visible top. Also, they may roll
over unexpectedly, stirring the waters around them.
Icebergs are parts
of glaciers that break off, drift into the water, float about awhile, and
finally melt. Icebergs floating today are made of snows that have fallen over
long ages of time. They include snows that drifted down hundreds, or many
thousands, or in some cases maybe a million years ago. The snows fell in Polar regions and on cold mountains, where they melted
only a little or not at all, and so collected to great depths over the years
and centuries.
As each year’s snow
accumulation lay on the surface, evaporation and melting caused the snowflakes
slowly to become tiny grains of ice. When new snow fell on top of the old, it
too turned to icy grains. So blankets of snow and ice grains mounted layer upon
layer and were of such great thickness that the weight of the upper layers pressed
the lower ones. With time and pressure from above, the many small
ice grains joined and changed to larger crystals, and eventually the deeper
crystals merged into a solid mass of ice.
65. The
underlined word “dazzlingly” in Paragraph 2 probably means “
”.
A. brilliantly B.
abundantly C.
beautifully D.
approximately
66. The author
states that icebergs are rarely seen because they are
.
A. broken
by waves soon after they are found
B. hidden
under the mountains
C. located
in remote regions of the world
D. surrounded
by fog
67. The
underlined phrase “from above” in the last paragraph refers to “
”.
A. sunlit
seas B. polar regions C. weight of mountains D. layers of ice and snow
68. According
to the passage, icebergs are dangerous because they
.
A. usually
melt quickly B. can turn over suddenly
C. may
create large snowdrifts D. may float and hit the ships suddenly
C
me differently after I told them I was in college. Customers would
joke that one day I’d be sitting at their table, waiting to be served.
Once I graduated, I took a job at a community newspaper. From my
first day, I heard a respectful tone from everyone who called me. I assumed
this was the way the professional world worked .
I soon found out differently. I sat several feet away from an
advertising sales representative with a similar name. Our calls would often get
mixed up and someone asking for Kristen would be transferred to Christie. The
mistake was immediately evident. Perhaps it was because money was involved, but
people used a tone with Kristen that they never used with me.
My job title made people treat me politely. So it was a shock to
return to the restaurant industry.
It’s no secret that there’s a lot to put up with when waiting
tables, and fortunately, much of it can be easily forgotten when you pocket the
tips. The service industry, by definition, exists to satisfy to others’ needs.
Still, it seemed that many of my customers didn’t get the difference
between server and servant.
I’m now applying to graduated school, which means someday I’ll
return to a profession where people need to be nice to me in order to get what
they want, I think I’ll take them to dinner first, and see how they treat
someone whose only job is to serve them.
69. The author was
disappointed to find that ____
___.
A. one’s position is used as a standard to measure one’s
intelligence
B. talented people like her should fail to get a respectable job
C. one’s occupation affects the way one is treated as a person
D. professionals tend to look down upon manual waitresses
70. What does the
author intend to say by the example in the second paragraph?
A. Some customers simply show no respect to those who serve them.
B. People absorbed in a phone conversation tend to be absent-minded.
C. Waitresses are often treated by customers as casual
acquaintances.
D. Some customers like to complain because of the waitress’ poor
service.
71. How did the author feel when waiting tables at the age of 19?
A. She felt it
unfair to be treated as a mere servant by professional.
B. She felt badly
hurt when her customers regarded her as a peon.
C. She was
embarrassed each time her customers joked with her.
D. She found it
natural for professionals to treat her as inferior.
72. The
underlined sentence “many of my customers didn’t get the difference between
server and servant” in Paragraph 7 means “
”.
A. those who satisfy
others’ needs are sure to be looked down upon.
B. those working in
the service industry shouldn’t be treated as servants.
C. those serving
others have to put up with rough treatment to earn a living.
D. the majority of
customers tend to look on a servant as server nowadays.
D
WASHINGTON(Reuters)-Vast
areas of US Pacific Ocean waters could be protected as marine protected areas
or monuments, the White House said on Monday, drawing praise from environmental
groups.
President George W.
Bush started the process by directing the US secretaries of the Interior. Defense
and Commerce departments to judge whether certain locations in the Pacific
should be designated(指定)as marine protected areas, White House spokesman Tony Fratto said.
The areas being considered for protection in the new plan are a group of
islands and atolls(环状珊瑚岛)in the remote central Pacific, including the Rose Atoll near
American Samoa, and some of the waters around the Northern Mariana Islands in
the western Pacific.
The action comes a
month after Bush in a symbolic action put an end to a White House ban on
offshore drilling closer to home as gas prices rose. Environmental groups said
expanded offshore drilling, which would still require congressional approval,
would not cut gas costs and could hurt wildlife. Bush established a national
monument in the northwestern Hawaiian Islands
in 2006, creating the largest marine protected area in the world. Monday’s
announcement starts a process that could result in more such protected ocean
areas by the end of Bush’s presidency(总统任期)in January.
Joshua Reichert of
the Pew Environment Group called the announcement “a hopeful sign for ocean
conservation” but said designation as a marine protected area or monument could
still permit commercial fishing and deep sea mining.
“However, if the
president establishes these new sites as protected areas, where no destructive
activity is allowed, it would be one of the most significant environmental
achievements of any US president,” Reicehrt said in a statement.
73. What’s the
right order of the events according to the passage?
a. Bush ended a
White House ban on offshore drilling.
b. Bush set up a
national monument in the northwestern Hawaiian Islands.
c. Bush started a
process to protect the vast areas of US Pacific Ocean.
d. Bush started his
presidency.
A. d, a, b,
c B.
d, b, a, c C.
b, a, c, d D.
a, b, c, d
74. Environmental
groups’ attitude toward expanded offshore drilling can be described as “ ”.
A. negative B.
positive C.
agreeable D.
optimistic
75. It can be
inferred from the passage that
.
A. the
areas for protection were considered one month ago
B. Bush
will be the first US
president to gain the most significant environmental achievements
C. Monday’s
announcement still requires congressional approval
D. environmental
groups are satisfied with Monday’s announcement
76. From the
passage we can know that Joshua Reichert
.
A. didn’t
agree with the announcement
B. hoped to
permit commercial fishing
C. didn’t
trust the announcement at all
D. still
worried about some destructive activities
E
Can computer reason?
Reasoning requires the individual to take a given set of facts and draw correct
conclusions. Unfortunately, errors frequently occur. Now, or at least soon,
computers will be able to do logical reasoning in a variety of areas without
making errors. The key to avoiding errors is to use a computer program that
relies on the recent research in this field. AURA(Automated Reasoning
Assistant) is the program that is the best example of this use of the computer.
AURA solves a
program by drawing conclusions from a given set of facts about the problem. The
program reaches logical conclusions perfectly as it uses various types of
reasoning and solves almost all problems by using advanced techniques to find a
contradiction(矛盾).
One generally starts
with a set of assumptions and adds a statement that the goal is unreachable.
For example, if the problem is to test a safety system that automatically(自动地) shuts down a nuclear reactor
when instruments indicate a problem, AURA is told that the system will not shut
the reactor down under those circumstances. If AURA finds a contradiction
between the statement and the system’s design assumptions, then this aspect of
the reactor’s design has been proved satisfactory. This strategy lets AURA concentrate
on the problem at hand and avoid many fruitless steps.
The chief use for
AURA at this time is for electronic circuit(电路)design check, but a number of other uses will arise. For example,
there already exist “expert systems” that are special purpose programs designed to automate reasoning in
a specific area such as medical diagnosis. These expert systems continue to
improve and have an endless life. Moreover, they can be reproduced just for
pennies. A human who can expertly predict where to drill for oil is in great
demand. A program that can predict equally well would be invaluable and could
be reproduced any number of times.
Will the computer
replace the human being? It seems likely that computer programs will reproduce
more clever programs, such programs will assist, rather than replace, humans.
Reasoning assistants will enable human minds to turn to deeper and far more
complex ideas, which will be partially prepared and then checked for reasoning
flaws by a reasoning program. Many errors will be avoided.
77. The way AURA works is to
.
A. explore the faults
in designing.
B. discover the
viruses in a program.
C. find out what is
against the set programs
D. predict by
reasoning.
78. All of the following are mentioned as areas for the use of AURA
EXCEPT
.
A. electronic
engineering. B.
search for oil
C. identification of
diseases. D.
mental logic
79. All of the following are advantages of expert programs EXCEPT
.
A. they can be
reproduced endlessly B.
they are featured by self analysis.
C. they may be
enriched in contents. D.
they are reproduced almost free.
80. What’s the best title for the passage?
A. Practical Uses of
computers. B.
Suggested applications for AURA.
C. The technical
perfection of AURA. D.
Computer aid to human reasoning.
第四部分:书面表达(满分25分)
假设你叫李华,是一名高三学生。你的英国朋友Tom因为工作忙没有看奥运比赛,所以发e-mail向你了解刘翔因脚伤退赛的相关信息。请根据下列要点,用英文给Tom回一封电子邮件。
要点:
1. 2008年8月18日刘翔因脚伤退赛;
2. 你深感惋惜;
3. 表示将继续支持刘翔;
4. 祝愿刘翔早日伤愈,重返赛场。
注意:
1. 词数100左右;
2. 电子邮件的开头和结尾已为你写好(不计你所写词数)。
Dear Tom,
You said in
your e-mail that you didn’t watch the Olympic Games because of your busy work
and wanted to know something about Liu Xiang’s quitting the men’s 110-meter
hurdles…
Sincerely yours,
Li Hua
试题详情
2008年高考化学试题分类解析
化学计算
1.(08海南卷)在两个密闭容器中,分别充有质量相同的甲、乙两种气体,若两容器的温度和压强均相同,且甲的密度大于乙的密度,则下列说法正确的是( )
A.甲的分子数比乙的分子数多
B.甲的物质的量比乙的物质的量少
C.甲的摩尔体积比乙的摩尔体积小
D.甲的相对分子质量比乙的相对分子质量小
解析:根据阿伏加德罗定律可知同温同压下气体的密度之比等于摩尔质量之比,即=,由于>1,所以M(甲)>M(乙);由于它们的质量相等,所以甲的物质的量比乙的物质的量少,甲的分子数比乙少;由于它们的外界条件相同,所以它们的摩尔体积相同。
答案:B。
2.(08广东卷)能表示阿伏加德罗常数数值的是( )
A.1mol金属钠含有的电子数
B.标准状况下22.4L苯所含的分子数
C.0.012kg12C所含的原子数
D.1L1mol?L-1的硫酸溶液所含的H+数
解析:选项A中1molNa含有的电子数为23NA;选项B中苯在标准状况下为液体,不能用n=V/22.4来计算苯的物质的量;选项C中0012kg为1mol,所含的原子数就是一个阿伏加德罗常数;选项D中由于H2SO4为强电解质,所以溶液中的H+的物质的量为2mol,即H+数为2NA。
答案:C
3.(08海南卷)设NA为阿伏加德罗常数,下列说法正确的是(
)
A.标准状况下,5.6L四氯化碳含有的分子数为0.25NA
B.标准状况下,14g氮气含有的核外电子数为5NA
C.标准状况下,22.4L任意比的氢气和氯气的混合气体中含有的分子总数均为NA
D.标准状况下,铝跟氢氧化钠溶液反应生成1mol氢气时,转移的电子数为NA
解析:选项A中CCl4在标准状况下为液体,所以其物质的量时不能用n=V/22.4计算,选项B中n(N2)=0.5mol,1molN2中含有14mol电子,所以0.5molN2含有7NA;选项C中在标准状况下,22.4L的气体为1mol,不管是混合气体还是纯净的气体,所含的分子数均为NA;选项D中生成1molH2,转移的电子数必定为2NA。
答案:C。
4.(08上海卷)在一定的条件下,完全分解下列某化合物2g,产生氧气1.6g,此化合物是( )

解析:此题主要考查摩尔质量。选项A中m(16 O2)=×16g?mol-1=1.78g;选项B中m(16O2)=×16g?mol-1=1.6g;选项中m(18O2)=×18g?mol-1=1.8g;选项中m(18O2)=2g/22g?mol-1×18g?mol-1=1.64g。
答案:B
5.(08四川卷)下列说法不正确的是( )
A.1mol氧气含有12.04×1023个氧原子,在标准状况下占有体积22.4L
B.1mol臭氧和1.5mol氧气含有相同的氧原子数
C.等体积、浓度均为1mol/L的磷酸和盐酸,电离出来的氢离子数之比为3∶1
D.等物质的量的干冰和葡萄糖中所含碳原子数之比为1∶6,氧原子数之比为1∶3
解析:选项C中H3PO4为中强酸,只能部分电离,而盐酸为强酸,完全电离,所以两种溶液中的H+数之比
小于3∶1。
答案:C。
6.(08上海卷)设NA为阿伏加德罗常数,下列说法正确的是( )
A.23gNa在氧气中完全燃烧失电子数为0.5NA
B.1L2mol?L-1的MgCl2溶液中含Mg2+数为2NA
C.标准状况下,11.2LSO3所含分子数为0.5NA
D.室温下,8g甲烷含有共价键数为2NA
解析:选项A中n(Na)=1mol,转移的电子数为NA;选项B中n(MgCl2)=2mol,但Mg2+部分水解,所
以溶液中含Mg2+数小于2NA;选项C中SO3在标准状况下为液体。
答案:D
7.(08上海卷)在石灰窑中烧制生石灰,1molCaCO3完全分解所需要的能量,可燃烧0.453mol碳来提供。设空气中O2体积分数为0.21,N2为0.79,则石灰窑产生的气体中CO2的体积分数可能是( )
A.0.43 B.0.46 C.0.49 D.0.52
解析: C+O2
CO2
CaCO3
CaO+CO2↑
0.453mol 0.453mol 0.453mol 1mol
1mol
产生的CO2的总量为:1.453mol,消耗0.453molO2含有的N2为=1.70mol,所以气体中的CO2的体积分数为:=0.46。
答案:A、B
8.(08上海卷)生态溶液涉及农家肥料的综合利用,某种肥料经发酵得到一种含有甲烷、二氧化碳、氮气的混合气体。2.016L(标准状况)该气体通过盛有红色CuO粉末的硬质玻璃管,发生的反应为:CH4+4CuO
CO2+2H2O+
4Cu。当甲烷完全反应后,硬质玻璃管的质量减轻4.8g。将反应后产生的气体通过过量的澄清石灰水,充分吸收,生成沉淀8.5g。
(1)原混合气体中甲烷的物质的量是____________。
(2)原混合气体中氮气的体积分数为多少?(写出计算过程)
解析:由于硬质玻璃管减少的质量为CuO中的氧的质量,所以n(CuO)==0.3mol,由方程式可知反应的CH4的物质的量为0.075mol。生成的CO2也为0.075mol,将气体通过澄清的石灰水生成8.5g沉淀,所以n(CO2)=0.085mol,原混合气体中的n(CO2)=0.01mol,而气体的总物质的量为:=0.09mol,所以n(N2)=0.005mol,N2的体积分数为:×100%=5.56%。
答案:(1)0.075mol。
(2)5.56%。
9.(08上海卷)小苏打、胃舒、平达喜都是常用的中和胃酸的药物。
(1)小苏打片每片含0.5gNaHCO3,2片小苏打片和胃酸完全中和,被中和的H+是___________mol。
(2)胃舒平每片含0.245gAl(OH)3。中和胃酸时,6片小苏打片相当于胃舒平_____片。
(3)达喜的化学成分是铝和镁的碱式盐。
①取该碱式盐3.01g,加入2.0mol?L-1盐酸使其溶解,当加入盐酸42.5mL时,开始产生CO2,加入盐酸至45.0mL时正好反应完全,计算该碱式盐样品中氢氧根与碳酸根的物质的量之比。
②在上述碱式盐溶于盐酸后的溶液中加入过量的氢氧化钠,过滤,沉淀物进行干燥后重1.74g,若该碱式盐中氢元素的质量分数为0.040,试推测该碱式盐的化学式。
解析:(1)2片小苏打所含NaHCO3的质量为1g,其物质的量为=0.012mol,
由HCO3-+H+===CO2↑+H2O,可知n(H+)=0.012mol。
(2)6片小苏打的物质的量为:=0036mol,即中和的H+为0.036mol,而每片的Al(OH)3的物质的量为=0.0031mol,由Al(OH)3+3H+ ===Al3++3H2O,所以Al(OH)3的片数为:=3.8片。
(3)①碱式盐中加入HCl,首先是碱式盐中的OH-和CO32-与H+反应生成H2O和HCO3-,所以n(HCO3-)=2.0mol?L-1×0.0025L=0.005mol,即n(CO32-)=0.005mol,H+与CO32-与HCl反应的H+的总物质的量为:2.0mol?L-1×0.0425L=0.085mol,所以n(OH-)=0.08mol,它们的物质的量之比为:16∶1。
②能与过量的NaOH溶液反应产生沉淀的只有Mg2+,所以n[Mg(OH)2]==0.03mol,若碱式盐中不含结晶水,则氢元素的质量分数为:0.08mol×1g/mol=0.08g,氢元素的质量分数为:=0.027<0.04,说明碱式盐中含有结晶水,根据题意有:m(Al)+m(H2O)+0.03mol×24g/mol+0.005mol×60g/mol+0.08mol×17g/mol=3.01g,=0.04,所以m(H2O)=0.36g,n(H2O)=002mol,m(Al)=0.27g,n(Al)=001mol,所以n(Al3+)∶n(Mg2+)∶n(OH-)∶n(CO32-)∶n(H2O)=0.01mol∶0.03mol∶0.08mol∶0.005mol∶0.02mol=2∶6∶16∶1∶4,即碱式盐的化学式为:Al2Mg6(OH)16CO3?4H2O。
答案:(1)0.012mol。
(2)3.8。
(3)n(OH-)∶n(CO32-)=16∶1。
(4)Al2Mg6(OH)16CO3?4H2O。
10.(08广东卷)相同质量的下列物质分别与等浓度的NaOH溶液反应,至体系中均无固体物质,消耗碱量最多的是( )
A.Al B.Al(OH)3 C.Al Cl3 D.Al2O3
解析:m(Al):m(NaOH)=27:40;
m(Al(OH)3):m(NaOH)=75:40;
m(AlCl3):m(NaOH)=33.375:40;
m(Al2O3):m(NaOH)=51:40;
所以相同质量的物质,消耗碱量最多的是Al。故选A。
答案:A
11.(08广东卷)设阿伏加德罗常数(NA)的数值为nA,下列说法正确的是( )
A.1molCl2与足量Fe反应,转移的电子数为3nA
B.1.5 mol NO2与足量H2O反应,转移的电子数为nA
C.常温常压下,46 g的NO2和N2O4混合气体含有的原子数为3nA
D.0.10mol Fe粉与足量水蒸气反应生成的H2分子数为0.10nA
解析:Fe过量可使Fe3+还原为Fe2+,A错误。3NO2+H2O==2HNO3+NO,易知B正确。C中,
可把N2O4看作2NO2,则有1moLNO2,所以有3mol原子;也可以用极端方法,看作全部NO2或全部N2O4考虑,也可得出结果。3Fe+4H2O===Fe3O4+4H2↑,由方程可知D错误。
答案:B、C
12.(08江苏卷)用NA表示阿伏加德罗常数的值。下列叙述正确的是( )
A.常温常压下的33.6L氯气与27g铝充分反应,转移电子数为3NA
B.标准状况下,22.4L己烷中共价键数目为19NA
C.由CO2和O2组成的混合物中共有NA个分子,其中的氧原子数为2NA
D.1L浓度为1mol?L-1的Na2CO3溶液中含有NA个CO32-
解析:选项A中n(Al)=1mol,Cl2的物质的量不能确定,当Cl2的物质的量小于1.5mol时,转移的电子数小于3NA,当Cl2的物质的量等于或大于1.5mol时,转移的电子数为1.5mol;己烷在标准状况下为液体,所以其物质的量不能用n=来确定;选项C中含有NA个分子的CO2和O2,其物质的量为1mol,而不管是CO2还是O2 1mol中均含有2mol的O,NA个CO2和O2的混合气体所含的O数为1mol;选项D中CO32-为弱酸根离子,水解后使得CO32-的物质的量小于1mol,CO32-的个数小于NA。
答案:C。
13.(08山东卷)NA代表阿伏加德罗常数,下列叙述错误的是( )
A.10 mL质量分数为98%的H2SO4,用水稀释至100 mL,H2SO4的质量分数为9.8%
B.在H2O2+Cl2=2HCl+O2反应中,每生成32 g氧气,则转移2NA个电子
C.标准状况下,分子数为NA的CO、C2H4混合气体体积约为22.4
L,质量为28 g
D.一定温度下,1 L 0.50 mol?L-1 NH4Cl溶液与2 L 0.25 mol?L-1 NH4Cl溶液含NH+4物质的量不同
解析:选项A中根据稀释前后溶质的质量不变得:10mL×ρ(前)×98%=100mL×ρ(后)×ω(后),所以ω(后)=,由于反应前后溶液的密度不能确定,所以其质量分数也不能确定;选项B中n(O2)=1mol,O元素的化合价从-1价变为0价,所以每个O原子失去1个电子,故反应中转移的电子数为2NA;选项C中分子数为NA的CO和C2H4其物质的量为1mol,则在标准状况下所占的体积为22.4L,由于它们的摩尔质量都是28g?mol-1,即平均摩尔质量也为28g?mol-1,所以其质量为28g;选项D中由于NH4++H2O
NH3?H2O+OH-,浓度越小,水解程度越大,所以溶液中所含NH4+的物质的量不同。
答案:A。
14.(08四川卷)在Al2(SO4)3和(NH4)2SO4的混合溶液中加入bmol的BaCl2,恰好使溶液中的SO42-完全沉淀;如加入足量强碱并加热可得到cmolNH3,则原溶液中的Al3+的浓度(mol/L)为( )
A. B. C. D.
解析:由于NH3的物质的量为cmol,由原子守恒和电荷守恒得:(NH4)2SO4的物质的量为mol,反应时用去的BaCl2的物质的量也为mol,剩余的BaCl2为(b-)mol,则Al2(SO4)3中的SO42-的物质的量也为(b-)mol,由电荷守恒得:n(Al3+)×3=(b-)×2,所以c(Al3+)=mol/L。
答案:C。
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