1.单选题- (共7题)
A.将红热铁丝插入氧气中,火星四射,放出大量的热,生成黑色四氧化三铁固体 |
B.硫酸铜溶液与氢氧化钠溶液混合,产生白色沉淀 |
C.红磷在空气中燃烧,产生大量白雾 |
D.“铜绿”与盐酸混合,得到蓝色溶液 |
A. 制漂白粉 2Cl2+2Ca(OH)2=CaCl2+Ca(ClO)2+2H2O
B. 高炉炼铁3CO+Fe2O3

C. 潜艇供氧2Na2O2+2H2O=4NaOH+O2↑
D. 焊接铁轨2Al+Fe2O3

A.薄荷醇由10个碳原子、20个氢原子和1个氧原子构成 |
B.薄荷醇属于含氧化合物 |
C.薄荷醇中碳元素的质量分数约为50% |
D.薄荷醇中碳元素、氢元素和氧元素的质量比为10:20:1 |
2.选择题- (共2题)
阅读下面短文,从短文后各题所给四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑
On our first anniversary, Jack bought a bottle of Casaque, an expensive cologne(古龙香水)for me. "We agreed to save the money for your postgraduate education", I said somewhat half-heartedly as I took it out from a beautifully-wrapped packet. "I am unable not to give something 1 to the world's most beautiful bride, honey!" I held it to my2, and smelled the most pleasant flavor I could ever3. Looking down at my4blue jeans and ugly, ragged tennis shoes, I wondered if I could ever be worthy of it. But I would 5. I used only a little of it every time 6Jack graduated and our life was financially easier. It's a 7the foolish love of a young husband.
Then one day three-year-old Jim was sitting on the floor8the empty cologne bottle. His lips wet, he was making a(n) 9face. He drank my10cologne! "Jack, come quick," I cried, "can cologne11my baby? Jim drank the rest of it!" "It's mostly just alcohol, honey," Jack12me. Little Jim was fine, and my concern for my child was13. I now felt 14to see the empty cologne bottle.
A few weeks later, Jack bought another bottle of my beloved cologne. I 15it as much as I had done to the earlier one. 16, it became three-quarters empty. I thought it best to buy another 17. But the shop assistant told me that there wasn't even a maker of that brand any more.
Now I only use my special cologne on very important occasions, because there will be18to replace it when these last few precious19are gone. But from the bottom of my heart it's not three-quarters empty but still one-quarter full. Perhaps if I'm very careful, I can 20using it for the rest of my life.
3.多选题- (共1题)
4.填空题- (共2题)
(1)用文字描述下列化学符号的意义:
①2H2O2_____________ ②

③5Si_______ ④3Ca2+___________
(2)用下列字母序号填空:
a.Mg b.N2 c.O2 d.CO
①_______________用于急救病人 ②___________可充入食品包装
③____________可制作照明弹 ④_____________是管道煤气的主要成分
(3)写出下列反应的化学方程式:
①红磷在空气中燃烧_________ ②铜绿受热分解_____________
③铁和硫酸铜溶液____________ ④硝酸铵受热分解生成N2O气体和水__________
(1)部分地下水溶有较多含 的物质,这种水称为硬水。用 可鉴别硬水与软水。
(2)电解水时,为增强水的导电性,可在水中加少量 ,在与直流电源 极相连的电极上产生氢气。
(3)水由 组成,保持水的化学性质的最小微粒是 (填化学式)。
(4)下列做法会造成水体污染的有 (填字母序号)。
a.工业废水直接排放
b.工业废气处理后排放
c.广泛使用含磷洗衣粉
d.大量使用化肥、农药
(5)图为自然界水循环示意图下列关于水的天然循环的说法中正确的是 (填字母)。

a.水在天然循环过程中实现了水的自身净化
b.水的天然循环是通过水的三态变化实现的
c.太阳为水的天然循环提供了能量
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【1】题量占比
单选题:(7道)
选择题:(2道)
多选题:(1道)
填空题:(2道)
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【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:2
7星难题:0
8星难题:5
9星难题:3