2015届江苏省灌云县穆圩中学九年级上学期第一次月考化学试卷

适用年级:初三
试卷号:323127

试卷类型:月考
试卷考试时间:2014/12/5

1.单选题(共4题)

1.
厨房里发生的下列变化中,不属于化学变化的是
A.天然气燃烧 B蔬菜腐烂 C.铁锅生锈 D.水沸腾
2.
下列物质的性质中属于化学性质的是( )
A.导电性B.可燃性C.延展性D.挥发性
3.
空气成分中,体积分数约占78%的是 ( )
A.氧气B.氮气C.二氧化碳D.稀有气体
4.
小明发现罩在蜡烛火焰上方的烧杯内壁被熏黑.他的下列做法不正确的是(  )
A.反复实验,并观察是否有相同现象
B.认为与本次实验无关,不予理睬
C.查找蜡烛成分资料,探究黑色物质成分
D.向老师请教生成黑色物质的原因

2.选择题(共1题)

5.

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.

3.填空题(共1题)

6.
某同学设计了测定空气中氧气含量的实验,实验装置如图所示.该同学的实验步骤如下:

①将图中的集气瓶分为5等分,并做好标记;
②在带橡皮塞和导管的燃烧匙内装入足量的红磷,将导管上的止水夹夹紧,在酒精灯上点燃红磷,并立即伸入集气瓶内,塞紧橡皮塞;
③充分反应后,待集气瓶冷却至室温,打开止水夹.
请回答下列问题:
(1)该实验中红磷需稍过量,目的是:______,点燃红磷时能看到的现象是______,写出红磷燃烧的文字表达式
(2)步骤③中打开止水夹后观察到的现象是:   
(3)本实验体现了氮气具有的性质是 (任写一点)。
(4)通过本实验测得氧气小于空气体积的l/5,则可能的原因有哪些?(答出一点即可).
试卷分析
  • 【1】题量占比

    单选题:(4道)

    选择题:(1道)

    填空题:(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:0

    5星难题:0

    6星难题:2

    7星难题:0

    8星难题:1

    9星难题:2