(初二补习)第一章
Quiz
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Science
•
8th Grade
•
Practice Problem
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Medium
Chin Tay
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11 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
有关水的叙述中,错误的是 ( )。
纯水是无色无气味的液体
将温度降至0℃时,纯水一定结冰
水在通常状况下很稳定
水中溶有食盐时,凝固点会降低至0℃以下
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
水在通直流电时分解成氢气和氧气,说明 ( )。
水是由氢气和氧气组成的
水是由氢元素和氧元素组成的
水里有氢气和氧气
通电分解时,生成氢气和氧气的体积比约为l:2
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
水电解产生氢气和氧气是一种( )。
物理变化
化学变化
物理性质
化学性质
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
一个水分子是由( )组成的。
2个氢气分子和1个氧气分子
1个氢气分子和2个氧气分子
2个氢原子和1个氧原子
1个氢原子和2个氧原子
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
下列关于电解水实验的说法错误的是( )。
正极产生的气体能使带余烬的木条复燃
负极产生的气体具有助燃性
负极和正极产生的气体体积比为2:1
水电解的过程中水分子被破坏了
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
下列现象中与液体的表面张力有关的是( )。
小虫子能在水面上行走
木块漂浮在水面上
液体难被压缩
毛笔蘸墨写字
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
下列现象中不属于毛细现象的是( )。
点燃酒精灯
海水晒盐
砖块吸水
植物的蒸腾作用
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