
补习 初二下册 第2-3章 PART 1
Quiz
•
Science
•
8th Grade
•
Practice Problem
•
Medium
Sheng Hao Tan
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28 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
地球的地壳中含量最多的金属元素是
氧
硅
铝
铁
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
欲从含有细砂、食盐和蒸馏水的混合物中分离出食盐,下列哪些组合为最佳途径?
① :沉淀法 ② :蒸发法 ③ :过滤法 ④ :蒸馏法
① + ②
① + ④
② + ③
③ + ④
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
图1显示钠元素在元素周期表中的相关信息。X的数值是
44
22
11
6
4.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
下列的物质中,不属于有机物的包括
I.一氧化碳 II.二氧化碳 III.甲烷 IV.乙炔
I、II
II、III
III、IV
I、IV
5.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
氮的相对原子质量是14,这表示
氮电子的质量为14克
氮的原子核有14个电子
一个氮原子的质量为14克
一个氮原子的质量和一个碳-12原子的质量的1/12相比后,比值为14
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
以下是组成人体的常量元素,除了
钙
碘
磷
镁
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
上图显示碳酸根的离子的化学式。请问图中的数字2代表着什么?
两个CO3分子
两个氧元素
碳酸根的化合价
碳酸根的元素数量
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