1.计算题- (共1题)

请根据资料回答下列问题:
(1)硫酸亚铁(FeSO4)是常见补铁类保健品中的有效成分之一,其中铁、硫、氧三种元素的质量比为________;铁元素的质量分数为___________(计算结果保留至0.1%)。
(2)与100 g干黑木耳中的铁元素质量相等的硫酸亚铁的质量为___________mg。
2.单选题- (共9题)
A.化学性质与水不同 |
B.分子间的间隔比普通的液态水(0~100℃)的大 |
C.分子不再运动 |
D.氢、氧两种原子的个数比为2:1 |
选项 | 实验目的 | 实验方案 |
A | 检验氧气 | 用带火星的木条 |
B | 鉴别氮气和二氧化碳 | 分别放入燃着的木条 |
C | 鉴别水和过氧化氢溶液 | 分别加入少量二氧化锰 |
D | 鉴别硬水和软水 | 分别加入肥皂水 |
A.A | B.B | C.C | D.D |
3.选择题- (共1题)
Comets(彗星) are parts of our solar system. Like the planets, they go around the sun.
But comets are not made of solid rocks like planets. A comet is a ball of dust, stones, and ice. Many people call comets dirty snowballs.
The "snowball"may be only a few miles across. But when the sun heats the "snowball,"much of it is changed to gases. The gases spread out and form the comet's head, which may be thousands of miles across.
A comet moves fast in its trip around the sun. But when we see it, the comet does not seem to move. That's because it is so far away. The moon moves fast, but when you look at it, you can't see any motion(运动). That's because the moon is far away.
Each year astronomers(天文学家) discover new comets. Some of them are seen only once. They make one trip around the sun and then go away out into space. The sun's gravity cannot hold them.
Other comets, like Halley, keep returning. They have been captured by the sun. Halley's earliest visit was probably 3,000 years ago. It may keep returning for another 3,000 years.
But every time a comet goes around the sun, the comet loses part of itself. Gases and dust are pulled out of the comet. That's why Halley is now dimmer(暗淡的) than it used to be. Next time it visits us, in 2062, it may be even dimmer. Each visit it may get dimmer and dimmer, until it finally disappears.
4.填空题- (共9题)

(1)小白鼠在装有空气的密闭容器中可存活一段时间,说明空气中含有 ;
(2)小包装糕点类食品常采用充气包装,氮气是常用的填充气体。选用氮气作填充气的主要原因是 。

(1)白磷燃烧反应的文字表达式(或符号表达式) 。
(2)根据实验结果,计算空气中氧气的体积分数约为 (写出计算式和结果)。
(3)在整个实验过程中,集气瓶内的压强变化是 。
(4)集气瓶中预先装入50mL水,水起的作用是 。

A B C D E
(1)写出标有序号的仪器名称:①
(2)高锰酸钾制取氧气选用的发生装置为 (填序号,下同),收集装置为 或E。反应的文字表达式(或符号表达式) 。
(1)鱼儿能在水中生存,其原因是 (填字母序号)。
A.水的组成中含有氧元素 B.水能分解生成氧气 C.水中溶解一定量的氧气
(2)航天飞船发射过程中,常以液氢作燃料,液氧作助燃剂,反应的文字表达式(或符号表达式) 。

(1)图1所示的自来水缴费通知单中,包括的收费项目有 。
(2)图2所示的“一级处理”的目的是去除水中大块悬浮物和砂粒,其中“格栅”的作用与净水方法中的 类似(填字母序号)。
A.过滤 | B.活性炭吸附 | C.蒸馏 | D.煮沸 |
(1)写出D的化学式 ;
(2)写出C与E反应的文字表达式(或符号表达式): ;
写出D转化为C的文字表达式(或符号表达式): ;
(3)A物质可发生分解反应,其微观示意图如下,请在方框内画出丙的微粒图示。

A D C
(4)按下图装置进行实验(气密性良好),将液体滴入瓶中,关闭活塞。请根据表中现象,写出符合要求的物质,并从上述物质中选择。

现象 物质 | 气球变鼓,一段时间后不恢复原状 |
固体 | |
液体 | |
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【1】题量占比
计算题:(1道)
单选题:(9道)
选择题:(1道)
填空题:(9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:1
5星难题:0
6星难题:11
7星难题:0
8星难题:4
9星难题:3