1.简答题- (共2题)
(1)从灭火原理角度进行分类,①与②的灭火原理各是什么?
(2)请举一例把“温度降低到着火点以下”的灭火方法?
2.单选题- (共6题)
A.催化剂在化学反应中不能增加生成物的质量 |
B.电解水实验中正极和负极产生的两种气体质量比1:2 |
C.用肥皂水可以区别硬水和软水 |
D.点燃或加热可燃性气体前,检验其纯度 |
A.空气、二氧化碳、氧气 |
B.氧气、空气、二氧化碳 |
C.二氧化碳、空气、氧气 |
D.空气、氧气、二氧化碳 |
3.选择题- (共1题)
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6题)

请回答下列问题:
(1)图中A、B、C、D粒子共表示_____种元素.
(2)A、B、C中表示阳离子的是_____.
(3)若D为原子结构示意图,则D中x=_____.
(4)E中银元素原子的质子数为_____.
A.二氧化碳 | B.氢气 |
C.一氧化碳 | D.氧气 |
(1)理想的清洁﹑高能燃料是 ;
(2)用来抢救病人的气体是 ;
(3)冬天在密闭的房间用木炭烤火会引起中毒的是 .

(1)提醒人们注意节约用水的是(填字母) .
(2)①净水时加活性炭是利用其具有 ;生活中,可通过 的方法来将硬水软化,
②做细铁丝在氧气中燃烧的实验时,需先在集气瓶底放少量水(或一层细砂)的作用是 .

(1)写出仪器名称:a .
(2)用过氧化氢溶液和二氧化锰制取氧气时,所选用的发生装置是 (填序号),其反应的化学方程式是 .
(3)小明要制取少量CO2,其反应原理是 (用化学方程式表示),他制取该气体的收集装置是(填装置序号) .
5.实验题- (共1题)
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【1】题量占比
简答题:(2道)
单选题:(6道)
选择题:(1道)
填空题:(6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:1
5星难题:0
6星难题:11
7星难题:0
8星难题:2
9星难题:1