
初二下册第3+4章线上测试
Authored by 沈宛慧(古晋一中) 沈宛慧(古晋一中)
Science
8th Grade
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30 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
氯化钠的组成元素是氯和钠,则氯化钠与钠和氯的性质有何异同之处?
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列物质中,属于化合物的有哪些?I 钻石 II 葡萄糖 III 甲烷 IV 金属铁 V 蒸馏水 VI 氦气
I、II、III、IV
II、III、V
I、IV、VI
IV、V、VI
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列各组物质,按单质、氧化物、混合物顺序排列的一组是( )
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
某物质经分析,组成中只有一种元素,则该物质( )
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下图是气体分子示意图,●和○分别表示不同的原子,表示化合物的是( )
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
下列物质中氮的化合价由低到高排列的是( )
N2O5、NO2、NO、N2、NH3
NO、NH3、N2、NO2、N2O5
NH3、N2、NO、NO2、N2O5
N2、NO、NH3、NO2、N2O5
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
石灰氮(CaCN2)是由三种元素组成的盐,常用来制备复合肥,其中碳元素的化合价为+4价,则 氮元素的化合价是( )
-3
-2
+3
+5
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