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【免费下载】精编江苏省宿迁市沭阳县20232024学年九年级上学期第一次联考化学试题

  • 2026-02-19 11:39:53
【免费下载】精编江苏省宿迁市沭阳县20232024学年九年级上学期第一次联考化学试题

学年第一学期第一次联考

初三化学试卷

一、单选题(共10题,一题两分)

1. 下列化学用语表示正确的是

A. 2个氧原子:2OB. 2个氢原子:

C. 钙离子:氖气:

【答案】A

【解析】

【详解】A、氧原子用O表示,2个氧原子即2O。A正确;

B、氢原子用H表示,2个氢原子即2H。B不正确;

C、由离子的表示方法,在表示该离子的元素符号右上角,标出该离子所带的正负电荷数,数字在前,正负符号在后,带1个电荷时,1要省略;故钙离子表示为:Ca2+。C不正确;

D、氖气由氖原子构成,所以氖气用Ne表示。D不正确。

综上所述:选择A。              

2. 下列物质中,前者属于混合物,后者属于纯净物的是

A. 飞天茅台酒精B. 酱香拿铁拿铁

C. 纯净水D. 空气洁净的空气

【答案】A

【解析】

【分析】纯净物是由一种物质组成的,混合物是由两种或两种以上物质组成的。

【详解】A、飞天茅台是酒精和其他物质的混合物,酒精只含有一种物质,属于纯净物,故A正确;

B、酱香拿铁和拿铁都含有多种物质,属于混合物,故B错误;

C、水只含有一种物质,属于纯净物;纯净水中除了水,还含有其他物质,属于混合物,故C错误;

D、空气和洁净的空气中都含有氮气、氧气等气体,属于混合物,故D错误;

故选A

3. 建立模型是学习化学的重要方法,下列有关模型正确的是

A. 离子分类B. 原子结构

C微粒与元素关系D. 地壳中元素含量

【答案】A

【解析】

【详解】A.离子分阳离子和阴离子,此选项正确;

B.原子是由原子核和电子构成,原子核是由质子和中子构成,此选项错误;

C.元素是指具有相同质子数的一类原子的总称,所以是氧元素包含氧原子和氧离子,此选项错误;

D.地壳中元素含量由高到低的排列为氧、硅、铝、铁、钙,此选项错误;

故选A

4. 正确的化学实验操作对实验结果、人身安全非常重要。下图中的实验操作正确

A. 点燃酒精灯B. 液体取用

C. 移走蒸发皿D. 过滤

【答案】B

【解析】

【详解】A、禁止用酒精灯去引燃另一酒精灯,酒精灯要用火柴点燃,图中操作错误;B、取用液体药品时,瓶塞要倒放,标签要对准手心,瓶口紧挨,图中操作正确;C、正在加热的蒸发皿温度较高,为防止烫伤手,不能直接用手拿热的蒸发皿,应用坩埚钳夹取,图中操作错误;D、过滤液体时,要注意“一贴、二低、三靠”的原则,图中缺少玻璃棒引流,图中操作错误。故选B。

5. 下列叙述中正确的是

A. 原子中都一定有质子、中子和电子

B. 原子的质量约等于原子核内质子数和中子数之和

C. 同一元素的两种原子质子数和相对原子质量相同

D. 离子是带电,但是离子构成的物质是不带电的(不显电性)

【答案】D

【解析】

【详解】A、原子中不一定含有质子、中子、电子三种粒子,如氢原子核内没有中子。A不正确;

B、原子的相对原子质量约等于原子核内质子数和中子数之和。B不正确;

C、由于同一元素的两种原子质子数相同,中子数不同,相对原子质量=质子数+中子数,所以同一元素的两种原子的相对原子质量不同。C不正确;

D、离子是带电的原子,由离子构成的物质,因为其中阴阳离子电荷中和,对外不显电性。D正确。

综上所述:选择D。              

6. 镁是一种国防金属,军事上常用来制造“照明弹”,关于镁条燃烧的说法中,错误的是

A. 镁条燃烧发出耀眼的白光,证明发生了化学变化B. 镁条燃烧放出大量的热

C. 反应后生成白色固体D. 该反应是化合反应

【答案】A

【解析】

【详解】A. 有新物质生成的变化是化学变化,镁条燃烧有白色固体生成,证明发生了化学变化,此选项错误;

B. 镁条燃烧放出大量的热,此选项正确;

C. 反应后生成白色固体,此选项正确;

D. 由两种或两种以上的物质发生化学反应生成另一种物质的反应是化合反应,该反应是两种物质发生反应生成一种物质,属于化合反应,此选项正确。

故选A

7. 下列关于“一定”的说法中,正确的有

a.原子最外层电子数相同,化学性质一定相似b.质子数相同的粒子一定属于同种元素

c.由同种元素组成的物质一定是单质d.纯净物一定是由同种分子构成的

A. 0B. 1C. 2D. 3

【答案】A

【解析】

【详解】a、元素原子最外层电子数相等,其化学性质不一定相似,例如镁原子和氦原子的最外层电子数都是2,但是二者的化学性质不同,故错误;

b、质子数相同的粒子不一定属于同种元素,例如水分子和钠离子的质子数都是10,但它们不是同种元素,故错误;

c、只由一种元素组成的物质不一定是单质,还有可能是混合物,例如氧气和臭氧组成的物质属于混合物,故错误;

d、纯净物不一定是由同种分子构成,还可以是同种原子构成的,如铜,还可以是离子构成的,如氯化钠,故错误;

故选:A。

8. 化学上用符号“”表示原子的组成,其中X代表元素符号,Z表示原子核内的质子数,A表示原子核内质子数与中子数之和。已知的电子层排布完全相同,则下列关系正确的是

A. b-a=d-cB. a-n=c+mC. b-n=d+mD. a+n=c-m

【答案】B

【解析】

【详解】阳离子是原子失去最外层电子形成的,质子数-离子所带电荷数=电子数。阴离子是原子得到电子形成的,质子数+离子所带电荷数=电子数。

所以a-n=c+m。

故选B。

9. 一定条件下,水在密闭容器里的冷却过程中,温度和时间的关系如图。①、②、③表示水在不同时刻的存在状态,下列说法正确的是

A. ①→②发生了化学变化B. 水分子运动速率:②>①

C. 水分子间的间隔:②>③D. 状态③的水分子静止不动

【答案】C

【解析】

【详解】A、 ① → ②是水的状态发生变化,由气态变为液态,没有产生新物质,是物理变化,故A错误;

B、由于在状态①时的温度高于状态②时的温度,所以状态①时水分子的运动速率大于状态②,故B错误;

C、由纵坐标的温度可知,③是固态的水,②是液态的水,水分子间的间隔②>③,故C正确;

D、无论温度高低,水分子一直都在做无规则运动,只是速率快慢差别,故D错误;故选C。

10. 装置气密性检验的原理是:通过气体发生器与附设的液体构成封闭体系,依据改变体系内压强时产生的现象(如气泡的生成、水柱的形成、液面的升降等)来判断装置气密性的好坏,下列装置中不能检查气密性的是

A. B. 

C. D. 

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  1. CONNECT:[ UseTime:0.000542s ] mysql:host=127.0.0.1;port=3306;dbname=no_yeyulingfeng;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000673s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001349s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000317s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000591s ]
  6. SELECT * FROM `set` [ RunTime:0.000265s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000604s ]
  8. SELECT * FROM `article` WHERE `id` = 469227 LIMIT 1 [ RunTime:0.000457s ]
  9. UPDATE `article` SET `lasttime` = 1771493958 WHERE `id` = 469227 [ RunTime:0.016969s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000345s ]
  11. SELECT * FROM `article` WHERE `id` < 469227 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000601s ]
  12. SELECT * FROM `article` WHERE `id` > 469227 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001386s ]
  13. SELECT * FROM `article` WHERE `id` < 469227 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003149s ]
  14. SELECT * FROM `article` WHERE `id` < 469227 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001031s ]
  15. SELECT * FROM `article` WHERE `id` < 469227 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001004s ]
0.104003s