1.计算题- (共1题)
(1)尿素的相对分子质量
(2)尿素中各元素的质量比
(3)尿素中氮元素的质量分数 (精确到0.1%)
(4)50kg尿素中氮元素的质量 (精确到0.1kg)
(5)一种化肥经测定含尿素90%,求这种化肥中氮元素的质量分数 (精确到0.1%)
2.单选题- (共3题)
A. 氯元素属于非金属元素
B. 海水中含量最高的元素是氯元素
C. 氯原子易得电子形成氯离子(Cl﹣)
D. 氯气(Cl2)是由氯气分子构成
3.选择题- (共1题)
This boy is Peter Smith. His 1 name is Peter. His 2 name is Smith. His 3, Jack Smith and Mary Smith are teachers. Cindy Smith is a nice girl. She is Peter's 4. Peter's school 5 number is 201-20108. His teacher is Ms. White. Ms. White is 6 English teacher. Li Min is a Chinese boy. He is Peter's good 7 at school.
Look! This is Peter's room. Oh, what are 8? They are his notebooks, and 9 a pencil sharpener. Is the pencil sharpener Cindy's? Yes, it's 10. It's not her brother Peter's.
4.填空题- (共3题)

请通过比较、归纳,回答下列问题(不利用相对原子质量):
(1)一个甲烷分子和一个二氧化碳分子的不同点是_____________________
(2)氧分子、二氧化碳分子、水分子的相同点是________________________
(3)根据上述示意图,请从微观角度描述你获得的关于化学变化的一个信息:______________________
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【1】题量占比
计算题:(1道)
单选题:(3道)
选择题:(1道)
填空题:(3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:2
7星难题:0
8星难题:4
9星难题:1