1.单选题- (共17题)

①锌和稀硫酸;②石灰石和盐酸;③氯化钠和水;④氢氧化钠和水;⑤硝酸铵和水
A.①②③⑤ | B.①②④ | C.①②③⑤ | D.①③④⑤ |
A.煮沸的咸汤比煮沸的水温度高 |
B.溶液一定是无色透明的 |
C.食盐水能导电是因为食盐水中含有较多自由移动的离子 |
D.海水是盐溶液,所以冬天海水不易结冰 |
A.溶液是均一、稳定的混合物 |
B.溶液是均一、透明的无色液体 |
C.正在配制的蔗糖溶液下面更甜,说明溶液中总是下面更浓 |
D.糖水是溶液,所以糖水放再长时间,蔗糖也不会分离出来 |

A.溶质质量增加 | B.溶液质量不变 |
C.溶剂质量减少 | D.溶质质量分数不变 |

A.30℃时,A物质的溶解度为20g
B.20℃时,A和B的溶解度相同
C.10℃时,等质量的A和B饱和溶液中,B的溶剂最少
D.等质量的A和B的饱和溶液从30℃降到20℃时,B析出的晶体最多
A.蒸发10g水有NaNO3晶体析出 |
B.降低10℃时,有NaNO3晶体析出 |
C.加入10g NaNO3晶体,仍有NaNO3晶体未溶解 |
D.在该温度下,加入少许NaNO3晶体,晶体质量不减少 |
A.在温度不变时,溶剂量越多,溶质的溶解度越大 |
B.20℃时,100 g氯化钠饱和溶液中溶解了26.5 g氯化钠,则20℃时氯化钠的溶解度为26.5 g |
C.搅拌可以使固体物质的溶解度增大 |
D.20℃时将31.6 g硝酸钾放入100 g水中,形成硝酸钾的饱和溶液,20℃时,硝酸钾的溶解度为31.6 g |


A.t1℃时烧杯中甲、乙两物质形成的溶液是不饱和溶液 |
B.t1℃时烧杯中甲、乙两物质形成的溶液溶质质量分数约为16.7% |
C.t2℃时烧杯中甲物质溶液的质量是110g |
D.t2℃时乙物质的溶解度是30g |

资料:A的溶解度 | |||||
温度/℃ | 20 | 30 | 40 | 50 | 60 |
溶解度/g | 37.2 | 41.4 | 45.8 | 50.4 | 55.2 |
A.②中 A 的质量分数最大 |
B.③⑤中 A 的质量分数相等 |
C.②④⑤的溶液为饱和溶液 |
D.①③④⑤中没有固体存在 |

A.A的溶解度都大于B的溶解度 |
B.t1℃时,用等量水分别制成的A、B饱和溶液中,A的质量比B大 |
C.t2℃时,A、B两种饱和溶液中,溶质的质量分数相等 |
D.A、B两种饱和溶液都从t3℃降温到t2℃,析出的晶体一定等量 |

A.熟石灰的溶解度为0.165 g |
B.熟石灰的溶解度随温度升高而增大 |
C.熟石灰的饱和溶液降温时会析出晶体 |
D.20℃时,100 g水中加入1 g熟石灰,搅拌,得到饱和溶液 |

A.在t1℃时,三种物质的溶解度由大到水的顺序是甲>乙>丙 |
B.在t2℃时,甲、乙两物质的溶解度相等 |
C.甲、乙、丙三种物质的饱和溶液升温都会转化为不饱和溶液 |
D.当乙的饱和溶液中混有少量丙时,可采用降温结晶的方法析出丙 |
A.①②③④ | B.⑤②④① | C.⑤①②④ | D.③②④① |
2.选择题- (共9题)
Hello,everybody.Welcome to surf on a new Web site—SCIENCE NEWS FOR KIDS!
Our goal is to offer timely items of interest to kids,accompanied by suggestions for hands on activities,books, articles,Web resources,and other useful materials.
Our emphasis is on making the Web site attractive by offering kids opportunities to comment on and grade the subject matter,get ideas for science projects,and try out math puzzles.At the same time,we offer teachers creative ways of using science news in their classrooms.
The Science News for Kids Web site,supported by several corporations and foundations,strengthens the usefulness of Science News in the middle-school classroom and offers entertaining reading and activities for students interested in science.
A section of the Science News for Kids Web site is devoted to particular interests.At present,we have six such zones: a weekly brainteaser(难题)for those who enjoy solving and inventing puzzles (PuzzleZone),entertaining science-fiction composition exercises for those interested in writing (SciFiZone),and weekly science short description along with science project ideas and tips (ScienceFairZone).The GameZone contains a small selection of logic and memory games.The TeacherZone has materials,including question sheets related to the feature article of the week,so that teachers can bring science news topics to the classroom.The LabZone features a weekly hands on activity or science project idea.In the future,we might add additional zones,for example,for kids interested in robotics,the environment,computers,math,or veterinary(兽医的)medicine and animals.
Contact us at editor@snkids.com. Science News for Kids 1719 N Street,N.W.
Washington,DC 20036 Phone :202-785-2255 Fax: 202-659-0365
采用方法 | 获益方面 |
朗读、背诵 多听、交际 记日记 掌握语法 | 记忆力、英语思维 听说能力 书面表达 正确表达 |
注意:
1).词数100左右;
2).短文开头已给出,不计入总词数。
Dear classmates,
Now I'd like to tell you how I learn English.
1).你的态度;
2).列举上大学的好处(2-3点);
3).你对上大学的认识。
注意:
1).词数100左右;
2).可以适当增加细节,以使行文连贯;
3).信的开头与结束语已为你写好(不计入总词数)。
Dear Liu Hua,
I learn that you prefer to work directly after high school rather than go to college.But I don't think it is a wise choice in a long term.
Liu Ming
增加:在缺词处加一个漏字符号(∧),并在此符号下面写出该加的词。
删除:把多余的词用斜线(\)划掉。
修改:在错的词下划一横线,并在该词下面写出修改后的词。
注意:1.每处错误及其修改均仅限一词;2.只允许修改10处,多者(从第11处起)不计分。
After shopping,Mother and I went to a restaurant for lunch.I notice Mother looking at a nearby table occupy by an elderly woman and young couple.They ate silently,and it was clearly that things were not going well.As we left, Mother stopped on their table.“Excuse me,”she said,put her arm around the unhappy old woman.“You remind me so many of my mother.May I hug(拥抱)you?”The woman smiled happily as she accepted to it.After we left,I said, “That was very nice of you,Mother.So I didn't think she looked like Grandma.”“Neither did me,”said Mother cheerfully.
Does the age gap matter in a relationship?
The love story of French President Emmanuel Macron and Brigitte Trogneux, 24 years his senior, has aroused heated discussion on age differences {#blank#}1{#/blank#} relationships. Does age matter or should love prevail(战胜) over all?
I find {#blank#}2{#/blank#} a very heartwarming love story. Not just this couple,{#blank#}3{#/blank#}any couple - what does age difference matter after all? If they love each other,{#blank#}4{#/blank#} ( devote) to the relationship and work on making it strong, that is what{#blank#}5{#/blank#} (count).
It is nearly impossible for Chinese women to accept Macron's relationship. It is {#blank#}6{#/blank#} (common) for older men to marry younger women, but for an older woman to marry a younger man is often seen as {#blank#}7{#/blank#} (appropriate). If you get along well, go for it, it's your life and life is way too short{#blank#}8{#/blank#} (let) a potential soul mate get away because of what you think others would say. I think it really doesn't matter. It is involved in the {#blank#}9{#/blank#} (devote) of the people and how well they enjoy each other's company is important along with supporting each other {#blank#}10{#/blank#}(emotion), financially etc....
Reading good books is one of the greatest pleasures in life. It 1 our happiness when we are cheerful, and lessens our 2 when we are sad. A good book may absorb our attention so 3 that for the time being we forget our 4.
Whatever may be our main purpose in reading, good books should never fail to give us 5. With a good book in our hands we will never be 6. Whether the characters in the book are taken from real life or are purely 7, they may become our companions and make us laugh. The people we meet in books may 8 us either because they are similar to our close friends or because they present 9 types whom we are glad to welcome as new acquaintances. Our human friends sometimes 10 us, but the friends we make in books are always respect us. By turning the pages we can 11 them without any fear of hurting their feelings, When our human friends 12 us, good books are always there to give us sympathy and encouragement.
One of the most valuable gifts from books is 13. Few of us can travel far from home.14 all of us can lead varied lives through the pages of book. When we wish to 15 from the dull realities of everyday life, a book will help us when 16 else can. To travel by book we don't have to 17 and save a lot of money. Through books we may gel the thrill of adventure without 18. We can climb high mountains or cross the hoi sands of the desert,19, through books the whole world is ours for the asking. The 20 of our literary experiences are almost unlimited.
Reading good books is one of the greatest pleasures in life. It 1 our happiness when we are cheerful, and lessens our 2 when we are sad. A good book may absorb our attention so 3 that for the time being we forget our 4.
Whatever may be our main purpose in reading, good books should never fail to give us 5. With a good book in our hands we will never be 6. Whether the characters in the book are taken from real life or are purely 7, they may become our companions and make us laugh. The people we meet in books may 8 us either because they are similar to our close friends or because they present 9 types whom we are glad to welcome as new acquaintances. Our human friends sometimes 10 us, but the friends we make in books are always respect us. By turning the pages we can 11 them without any fear of hurting their feelings, When our human friends 12 us, good books are always there to give us sympathy and encouragement.
One of the most valuable gifts from books is 13. Few of us can travel far from home.14 all of us can lead varied lives through the pages of book. When we wish to 15 from the dull realities of everyday life, a book will help us when 16 else can. To travel by book we don't have to 17 and save a lot of money. Through books we may gel the thrill of adventure without 18. We can climb high mountains or cross the hoi sands of the desert,19, through books the whole world is ours for the asking. The 20 of our literary experiences are almost unlimited.
3.填空题- (共3题)

(已知水的密度约为1g/cm3)
实验操作 | 实验结果 |
取100mL水,加入25g硝酸钾,搅拌,恢复至20℃ | 全部溶解,得溶液① |
再加wg硝酸钾,搅拌,恢复至20℃ | 恰好饱和,得溶液② |
再加25g硝酸钾,搅拌,恢复至20℃ | 得溶液③ |
加热 | 全部溶解,得溶液④ |
冷却至20℃ | 析出晶体,得溶液⑤ |
(1)③中溶液的质量为 g;一定属于不饱和溶液的是(填序号,下同)
(2)析出晶体的质量为 。
A.25g B.(w+25)g C.(w+50)g
温度/℃ | 0 | 20 | 40 | 60 | 80 | 100 | |
溶解度/g | NaCl | 35.7 | 36.0 | 36.6 | 37.3 | 38.4 | 39.8 |
KNO3 | 13.3 | 31.6 | 63.9 | 110 | 169 | 246 | |
Ca(OH)2 | 0.18 | 0.16 | 0.14 | 0.12 | 0.09 | 0.07 |
(1)某饱和溶液随温度升高有固体析出,则该饱和溶液的溶质是 (填化学式)。
(2)要配制20℃时的NaCl饱和溶液100g,需要NaCl的质量为 g(保留小数点后一位)。
(3)某KNO3晶体中有少量NaCl、Ca(OH)2杂质,要得到纯净KNO3的方法是:先加热溶解,然后 ,过滤、洗涤、干燥后得到KNO3晶体。
-
【1】题量占比
单选题:(17道)
选择题:(9道)
填空题:(3道)
-
【2】:难度分析
1星难题:0
2星难题:0
3星难题:0
4星难题:3
5星难题:0
6星难题:16
7星难题:0
8星难题:1
9星难题:0