
科学知识测验-2
Quiz
•
Science
•
9th Grade
•
Easy
17T103 MING
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40 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
某矿泉水瓶标签上印有水质成分(mg/L)如下:硒0.013、锶0.056、钠1.84、锌0.00162等。这里的硒、锶、钠及锌等是指( )。
分子
元素
原子
化合物
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
钠原子的原子序数是11,相对原子量是23。钠的原子核内分别有多少个中子和质子?
12个中子,11个质子
11个中子,11个质子
12个中子,12个质子
11个中子,12个质子
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
地壳中含量最多的金属和含量最多的非金属元素形成的化合物的化学式( )。
Al2O3
CaO
Fe2O3
SiO2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
磷酸二氢钾(KH2PO4)是一种( )。
氮肥
磷肥
钾肥
复合肥
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在K2Cr2O7中铬(Cr)元素的化合价是( )。
+6
+3
+2
+7
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
某物质化学式为XO2,若该化合物相对分子量为64,则X可能为下列哪一种原子?
(相对原子质量(Ar):S=32,P=31,O=16,N=14,C=12)
S
P
N
C
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列是表示气体粒子的示意图,图中“●”和“〇”分别表示不同元素的原子,其中表示单质的是( )。
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