广西壮族自治区钦州市浦北县2018-2019学年九年级上学期期中化学试题

适用年级:初三
试卷号:320643

试卷类型:期中
试卷考试时间:2019/11/6

1.单选题(共4题)

1.
绿色化学有助于解决环境污染问题,下列做法中,不符合绿色化学理念的是( )
A.焚烧小麦秸秆B.垃圾分类回收C.拒绝一次性筷子D.发展太阳能电池
2.
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.
下列仪器中,用酒精灯加热试管内物质不需要用到的是
A.B.C.D.
4.
实验室有一瓶标签残缺的试剂可能是浓盐酸,有同学提出打开瓶塞观察。这属于科学探究中的
A.猜想假设B.收集证据C.设计实验D.得出结论

2.选择题(共1题)

5.

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.

3.填空题(共1题)

6.
请简要说明下列操作可能造成的不良后果:
倾倒药液时,标签没向着手心.________
向燃着的酒精灯添加酒精.________
滴管取用试剂后平放或倒置.________
被加热的玻璃容器外壁有水.________
把试管放在桌上使劲塞进塞子.________.

4.实验题(共2题)

7.
某化学兴趣小组利用如图装置探究制取气体的原理、方法。结合装置图,回答下列问题:

(1)写出图中标号仪器的名称:a_________。
(2)用氯酸钾和二氧化锰制取氧气时,可选用的发生装置是___(填上图字母,下同);发生反应的文字或符号表达式为_______________;若改用高锰酸钾制取氧气,需改进装置,在试管口塞一团_____,这样改动目的是__________________;
(3)二氧化碳是一种能溶于水的气体,密度比空气大,实验室中常用固体碳酸钙与液体稀盐酸反应来制取二氧化碳,发生装置用_____装置,收集装置用_____装置。
8.
某兴趣小组做如图所示实验探究分子的运动.请回答实验中的有关问题.(注:酚酞是一种酸碱指示剂,遇碱性物质变红色,遇酸性物质不变色,氨水呈碱性)

(1)实验 1:在盛有少量蒸馏水的小烧杯中滴入 2﹣3 滴酚酞试液,看到的现象是_______;由实验 1 得出的结论是______________________ 。
(2)实验 2(如图甲所示):烧杯 B 中出现现象的微观解释:___________________ 。
(3)为使实验结论准确可靠,该兴趣小组设计实验 3(如图乙所示)作为对比实验,你认 为有没有必要?___ ,请阐述你的理由:___________________ 。
(4)在实验时同学们闻到了一股难闻的刺激性气味,于是小丽对实验装置进行了改进,装置如图丙所示.

(实验操作)
第一步:向 B、C、E 三支试管中直接加入5mL的蒸馏水,各滴入1﹣2滴无色酚酞溶液,振荡,观察溶液颜色。
第二步:A、D 试管中分别加入2mL的浓氨水,立即用带橡胶塞的导管接实验图丙连接好,并将D试管放在盛有热水的烧杯中,观察几分钟。
(分析讨论)
①E 试管放有酚酞溶液的目的是_______________ 。
②进行操作丙时观察到的现象是________________ 。
③与改进前的实验比较,改进后实验的优点是_________________ 。
试卷分析
  • 【1】题量占比

    单选题:(4道)

    选择题:(1道)

    填空题:(1道)

    实验题:(2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:0

    5星难题:0

    6星难题:3

    7星难题:0

    8星难题:1

    9星难题:3