山西省右玉县二中2019届九年级上学期第二次月考化学试题

适用年级:初三
试卷号:304972

试卷类型:月考
试卷考试时间:2019/1/2

1.计算题(共1题)

1.
黄铜(铜锌合金)的外观与黄金极为相似、容易以假乱真。小红同学想测定黄铜中锌的含量。她称取20g黄铜样品放入烧杯中,加入足量稀硫酸充分反应后,测得生成氢气的质量为0.2g。
(1)该反应属于____________(填基本反应类型)。
(2)求黄铜样品中锌的质量分数为________(写计算过程)。

2.单选题(共5题)

2.
下列粒子结构示意图中,表示阳离子的是(   )
A.AB.BC.CD.D
3.
化学家戴维最早制得了曾用作麻醉剂的笑气(化学式为N2O),其中氮元素的化合价是(  )
A.-1B.-2C.+1D.+5
4.
人类生存离不开空气,下列说法错误的是()
A.空气是一种宝贵的资源B.空气中体积分数最大的是氮气
C.氧气能支持燃烧、供给呼吸D.露天焚烧垃圾不会造成空气污染
5.
小李学习了水的有关知识后,自制了如图所示的简易净水器,下列说法正确的是()
A.该净水器中的活性炭起吸附作用
B.该净水器可以降低自来水的硬度
C.该净水器能起到杀菌消毒的作用
D.该净水器可将自来水变为蒸馏水
6.
下列实验操作正确的是
A.闻气体气味B.检查气密性C.点燃酒精灯D.取用块状固体

3.选择题(共1题)

7.

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。

The benefits of keeping a journal(日志)

    If you want to grow, one important thing you should do is keep a journal. It may seem simple, but it can make a big difference in your life. I have been keeping journals for years. Writing all the lessons I learn and all the ideas I get has become a habit for me. {#blank#}1{#/blank#} Here are some benefits you will get by keeping a journal.

♦ It prevents you from losing an idea. Have you ever gotten an idea and lost it later because you didn't write it down? {#blank#}2{#/blank#} But then I developed the habit of writing down every idea that came into my mind as soon as possible. If I am away from my computer, I usually write it down on a piece of paper that I bring wherever I go. I will then transfer the idea to the journal in my computer.

♦ It helps you review all the lessons you've learned. By reviewing your journal, you can quickly see the lessons you've learned and the ideas you've gotten. {#blank#}3{#/blank#} You can use the ideas to propel yourself forward.

♦ {#blank#}4{#/blank#} After keeping a journal for years, you can look back at it and see how far you've gone. Things that were big problems in the past might seem small today. The raw ideas you had in the past have been realized today.

♦ It helps you expand your ideas. When you try to come up with a sentence to express an idea, you are thinking actively about it. {#blank#}5{#/blank#} In the end, you will expand your ideas.

A.I often experienced that myself.

B.It trains you to express your thoughts.

C.It allows you to see your progress over time.

D.Just use whatever tool you feel comfortable with.

E.Thinking actively helps you connect your idea to another idea.

F.And to be honest, I can't imagine what my life would be like without it.

G.Then you can do whatever necessary to avoid repeating the same mistakes.

4.填空题(共3题)

8.
食盐是重要的调味品,其主要成分的化学式是____________。蒸馒头时,既能除去面团中的酸又能使馒头变得松软,可加入小苏打,其化学式是____________。
9.
乐乐查阅资料发现CaCl2可用作干燥剂。他设计了下面的转换方法,用CaCO3制得CaCl2。图中“→”表示物之间的转化关系,“→”上方为反应条件或参与反应的另一种物质。

请回答下列问题:
(1)A的化学式为   ;反应①②③都不涉及的基本反应类型是   反应。
(2)牛牛认为CaCO3经一步反应就可转化为CaCl2,反应的化学方程式为     
(3)对比两同学的转化方法,我们发现熟练掌握物质的化学性质可以优化物质的转化途径。写出物质B经一步转化为CaCO3的化学方程式  
10.
能源既是国家经济发展的命脉。也是国家发展战略的重要支柱。我省多地有效调整能源结构,稳步发展安全高效的能源体系,合理利用如下三种发电方式,并取得了显著成效。

(1)与C相比,A、B发电的共同优点是_________________________(写一条)。
(2)A的能量转化方式是把______能经过一系列变化转化成电能。

5.实验题(共1题)

11.
如图是“粗盐中难溶性杂质的去除”的实验操作示意图:

(1)仪器a的名称_____;  
(2)图中各项操作中有错误的是(填序号)_____;
(3)操作B中还需用到的仪器是_______;
(4)操作C过滤时倒入液体时液面要低于滤纸边缘主要是为了防止__(填序号),其中玻璃棒的作用是__________。
A.过滤速度慢 B.滤纸破损    C.杂质未经过滤就进入滤液
(5)在操作D中,当蒸发皿中________应停止加热.
试卷分析
  • 【1】题量占比

    计算题:(1道)

    单选题:(5道)

    选择题:(1道)

    填空题:(3道)

    实验题:(1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:2

    5星难题:0

    6星难题:5

    7星难题:0

    8星难题:2

    9星难题:1