下图为硬脂酸甘油酯在碱性条件下水解的装置。 (1)在圆底烧瓶中装入7~8 g硬脂

题型:实验题

问题:

下图为硬脂酸甘油酯在碱性条件下水解的装置。

(1)在圆底烧瓶中装入7~8 g硬脂酸甘油酯,然后加入2~3 g氢氧化钠、5mL水和10 mL酒精。加入酒精的作用是________。

(2)判断油脂皂化反应基本完成的现象是________(填字母)。

A.反应液使红色石蕊试纸变蓝色 B.反应液使蓝色石蕊试纸变红色

C.反应后静置,反应液分为两层 D.反应后静置,反应液不分层

(3)图中长玻璃导管的作用为____________。

(4)写出该反应的化学方程式:____________________________。

(5)(4)中化学反应的反应类型不属于________(填字母)。

A.加成反应 B.取代反应 C.水解反应 D.皂化反应

考点:设计实验方案及探究实验
题型:实验题

某合作学习小组讨论辨析以下说法正确的是(  )

①粗盐和酸雨都是混合物

②沼气和水煤气都是可再生能源

③冰和干冰既是纯净物又是化合物

④不锈钢和目前流通的硬币都是合金

⑤盐酸和食醋既是化合物又是酸

⑥纯碱和熟石灰都是碱

⑦豆浆、雾、烟都是胶体

⑧利用丁达尔效应可以区分溶液和胶体.

A.①②③④⑥

B.①③④⑦⑧

C.③④⑤⑥⑦

D.①②④⑤⑧

题型:实验题

给下面一则消息拟写标题。(不超过20字)

新华网长春10月21日电(记者刘毅非)

  21日,由中国儿童少年基金会与恒源祥(集团)有限公司共同发起的“恒爱行动——寻找爱心父母为四川黑水地震灾区孤贫儿童编织爱心毛衣”活动在吉林省正式启动。启动仪式上,爱心编织团成员展示了他们为孤贫儿童编织的爱心毛衣。据了解,吉林省各市州也将陆续启动“恒爱行动”,并将精选一批爱心毛衣送给该省对口支援的四川黑水县孤贫儿童,帮助他们度过一个温暖的冬天。

答:______________________________________________

题型:实验题

阅读表达(共5个小题,每小题2分,共10分)

When Dan Shaw gets up from the sofa in his home, Cuddles is never far away. When he wants to go outside, he doesn’t take Cuddles out for a walk—Cuddles takes him for a walk. Cuddles is clearly no ordinary family pet. It is a two-foot-high miniature horse and serves as the guiding eyes of Shaw, who is blind.

When Shaw lost his sight, his wife suggested he apply for(申请) a guide dog. Shaw, an anima lover, said he couldn’t bear to part with a dog(which usually lives about eight to ten years)and get used to a new one, perhaps several times in his life.

Then Shaw heard of a program about the tiny guide horses. He learned that the horse possess many qualities that make them an excellent choice for guiding people. They are clean, friendly, smart and have great memories. They can be trained to remain calm in noisy and crowded places. Best of all, they live for 25-35 years, which would enable Shaw to have the same guide friend for most or all of his life.

Shaw immediately applied to be and was accepted as the first person to receive a guide horse. The instant he met Cuddles, he knew he was making the right choice. Then he began his training.

Through training, Shaw and Cuddles learned to find their way on busy streets, step over curbs(便道沿儿)and find elevator buttons. Cuddles even show its ability to step in front of Shaw and block him, to prevent him from walking into a dangerous situation The little horse also expertly led Shaw through busy shopping malls. They got along without any difficulties. Now Shaw is confident that Cuddles will change his life for the better.

小题1: What’s the meaning of the underlined word “miniature” in Paragraph 1?(No more than 2 words)

_______________________________________________________________

小题2:Why didn’t Shaw want to choose a dog as his guide?(No more than 15 words)

_______________________________________________________________

小题3: What does Paragraph 3 mainly tell us? (No more than 10 words)

_______________________________________________________________

小题4: How does Shaw feel about his future life with the help of Cuddles? (No more than 10 words)

________________________________________________________________

小题5: In your opinion, what is the ideal(理想的) relationship between man and animals? (No more than 20 words)

________________________________________________________________

题型:实验题

某工厂的一个生产小组,当每个工人在自己的工作岗位上工作时,9小时可以完成一项生产任务。如果交换工人A和B的工作岗位,其他人不变时,可提前1小时完成任务;如果交换工人C和D的工作岗位,其他人的工作岗位不变时,也可提前1小时完成任务。如果同时交换A和B、C和D的工作岗位,其他人的工作岗位不变,可以提前多少小时完成这项任务( )

A.1.6
B.1.8
C.2.0
D.2.4

题型:实验题

学习旅游心理学有助于我们掌握旅游者的(),提高服务质量。

A.行程

B.特点

C.心理

D.规律

更多题库