1.单选题- (共5题)
A.N(NO2)3由三种元素组成
B.N(NO2)3属于有机高分子化合物
C.N(NO2)3的相对分子质量152
D.N(NO2)3中氮元素的质量分数为18.4%

A.t1℃时,甲的溶解度小于乙的溶解度 |
B.M点处甲、乙的溶解度相等 |
C.t1℃时,向盛有50 g水的烧杯中加入22 g甲,充分溶解后所得的溶液为饱和溶液 |
D.t2℃时,甲、乙饱和溶液的溶质质量分数为:甲<乙 |
2.选择题- (共7题)
Hello. I'm Xu Wei. This is my sister, Xu Yi. And this is my brother, Xu Feng. This is my bedroom. Look, that is my new dress on the bed. I like it very much. My shorts are on the chair. My jeans are on the chair, too. That sweater isn't my sweater. It's my sister's. She's Xu Yi. The sweater is beautiful. I'd like one.
Hello. I'm Xu Wei. This is my sister, Xu Yi. And this is my brother, Xu Feng. This is my bedroom. Look, that is my new dress on the bed. I like it very much. My shorts are on the chair. My jeans are on the chair, too. That sweater isn't my sweater. It's my sister's. She's Xu Yi. The sweater is beautiful. I'd like one.
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3.填空题- (共5题)
(1)下列金属制品的用途中,主要利用金属导热性的是_______(写字母)。
A.剪刀 | B.炒锅 | C.电线 | D.白炽灯灯丝 |
(3)举出一例说明合金比纯金属应用更为广泛的原因_______________

(1)D是________(填化学式);
(2)图中物质间相互关系中未涉及到的基本反应类型是________________;
(3)A转化成C的反应化学方程式:______________。
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【1】题量占比
单选题:(5道)
选择题:(7道)
填空题:(5道)
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【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:4
7星难题:0
8星难题:4
9星难题:1