练习册

  • 练习册
  • 试题
    精英家教网 > 高中地理 > 题目详情

    【题目】室温时，下列混合溶液的pH一定小于7的是( )

    A．pH＝3的盐酸和pH＝11的氨水等体积混合

    B．pH＝3的盐酸和pH＝11的氢氧化钡溶液等体积混合

    C．pH＝3的醋酸和pH＝11的氢氧化钡溶液等体积混合

    D．pH＝3的硫酸和pH＝11的氨水等体积混合

    【答案】C

    【解析】pH相同的弱酸或弱碱的物质的量浓度比强酸或强碱的大。pH＝3的盐酸、醋酸、硫酸的c(H＋)均为10－3 mol·L－1；同理pH＝11的Ba(OH)2的溶液、氨水中c(OH－)均为

    10－3mol·L－1。显然等体积pH＝3的HCl或H2SO4与pH＝11的氨水混合时，氨水过量，pH>7；等体积的pH＝3的HCl与pH＝11的Ba(OH)2混合时，pH＝7；等体积pH＝3的醋酸和

    pH＝11的Ba(OH)2混合时醋酸过量，pH<7，故C项正确。

    练习册系列答案
    年级 高中课程 年级 初中课程
    高一 高一免费课程推荐！ 初一 初一免费课程推荐！
    高二 高二免费课程推荐！ 初二 初二免费课程推荐！
    高三 高三免费课程推荐！ 初三 初三免费课程推荐！
    相关习题

    科目：高中地理 来源： 题型：

    【题目】我国经济虽然有了较大的发展，但是文化消费市场潜力还很大。根据中共中央的指示精神，某地政府在探讨中达成了增强本地人民的文化自信，挖掘本地的文化消费潜力，培育新的经济增长点的共识：一是坚持中国特色社会主义文化发展道路，确保本地的文化建设始终沿着正确方向健康发展；二是不断增强经济硬实力，使文化的繁荣发展不再是空中楼阁；三是立足本地文化，深入挖掘本地文化思想内涵，继承本地文化基因。近几年来，该地政府在省内外频繁举办文艺演出等活动，扩大了当地文化的影响力。经过几年的努力，该地政府在增强本地人民的文化自信方面取得了显著的效果。

    结合材料，运用所学文化生活知识，分析说明该地是如何增强文化自信的。

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】听一段材料，回答下面几个小题。

    【1】What is the probable relationship between the speakers?

    A. Salesperson and customer B. Homeowner and cleaner C. Husband and wife

    【2】What kind of apartment do the speakers prefer?

    A.One with two bedrooms. B. One without furniture C. One near a market.

    【3】How much rend should one pay for the one-bedroom apartment?

    A.＄350. B. ＄400. C. ＄415

    【4】Where is the apartment the speakers would like to see?

    A. On Lake Street. B. On Market Street. C. On South Street.

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】以下是与高中生物实验有关的内容，请回答下列问题：

    （1）脂肪的鉴定中，洗去浮色时常用50%的酒精溶液，是因为 。

    （2）在“观察DNA和RNA在细胞中的分布”实验中，将口腔上皮细胞置入8%的盐酸溶液中水解的主要目的是 ，有利于DNA与染色剂结合。

    （3）比较过氧化氢在不同条件下的分解，实验的因变量是 。

    （4）在用琼脂块模拟细胞大小与物质运输关系的实验中，物质运输的效率可以用 来衡量。

    （5）生物组织细胞中某些成分的鉴定和结构的观察，需要选取适当的实验材料、试剂和仪器，下列材料、仪器（试剂）与成分鉴定和结构观察匹配不正确的有（ ）（多选）

    A．西瓜汁～斐林试剂～检测生物组织中的糖类

    B．嫩绿的菠菜叶～层析液～提取光合色素

    C．口腔上皮细胞～健那绿染液～观察DNA在细胞中的分布

    D．新鲜菠菜叶～高倍显微镜～观察叶绿体

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】“Perhaps we need to send for Dr.Smith to see what we can do about it,”Father suggested___to his neighbor who had come to discuss the problem

    A.tentatively

    B.thoughtlessly

    C.definitely

    D.rudely

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】听一段材料，回答下面几个小题。

    【1】What is the relationship between the two speakers?

    A. Travel agent and customer.

    B. Husband and wife.

    C. Boss and secretary.

    【2】When will the meetings end?

    A. At 3:00 pm. B. At 5:00 pm. C. At 6:30 pm.

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】At the initial stages of postwar, _______ maintaining of cooperative relationship with USA and strengthening Soviet’s interest, Stalin adopted negative attitude to the Communist Party of China.

    A. in the possession of

    B. for the sake of

    C. at the mercy of

    D. on the occasion of

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】B

    Montgomery County Special Olympics held its eighth yearly show of unified (联合的)basketball at Blessed Sacrament School. The gym was filled with cheerleaders (啦啦队队员), parents and friends. The walls were covered with posters made by thirdandfourthgraders at the school. And all the elementary, middle and high school unified teams were playing hard and having fun. Every basket, no matter which team scores, is cheered and celebrated.

    Special Olympics support more than 20 unified games. What are unified games? They are programs designed for players with special needs. In the games, they play with kids who are volunteers, called unified partners. The special athletes are unable to play normally like other healthy kids, and some of them are wheelchair (轮椅) users. In basketball, the unified partners rebound (抢得篮板球), pass and sometimes push a special athlete’s wheelchair. As Brian Ross, a seventhgrader at St. Albans School in Washington, says, ＂You just try to help and get everyone to take part.＂

    Some special athletes have come a long way to be where they are. Caleb Head is a 15yearold special athlete. When he started, Caleb would only stand at the door and watch. Then Caleb began to practice his shooting but still would not play in the games. Now Caleb runs up and down looking for his shot.

    The special athletes are not the only ones who benefit (受益) from unified sports; the unified partners do, too. Marla Grusin, whose son Tyler is a special athlete, says every kid should come to a Special Olympics game. If they do, they will learn ＂to share the ball＂ and that the game ＂is not all about me＂.

    Not a bad lesson for any athlete.

    【1】The first paragraph is about____________.

    A. the meaning of unified games

    B. Special Olympics’ development

    C. the benefits of playing basketball

    D. an exciting unified basketball game

    【2】Special Olympics are especially held for students who____________.

    A. are disabled

    B. love cheerleading

    C. know little about ball games

    D. want to become a star player

    【3】 According to the text, Brian Ross is most probably____________.

    A. a cheerleader B. a special athlete

    C. a unified partner D. a basketball teacher

    【4】According to Grusin, taking part in Special Olympics games can help children____________.

    A. learn basic basketball skills

    B. become more selfless

    C. improve their health

    D. get better grades

    查看答案和解析>>

    科目：高中地理 来源： 题型：

    【题目】听一段材料，回答下面几个小题。

    【1】Why will the woman be late?

    A. She didn't catch the train.

    B. She didn't finish her paper.

    C. She didn't wake up in time.

    【2】Where is the man?

    A. At the station. B. At home. C. At the office.

    【3】What is the probable relationship between the two speakers?

    A. Teacher and student. B. Parent and child. C. Husband and wife.

    查看答案和解析>>

    同步练习册答案