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初中化学:期末考试复习考点梳理

  • 2026-01-19 01:24:36
初中化学:期末考试复习考点梳理

1.下列物质的用途,利用其化学性质的是(A)

A.CO用于还原铁矿石      B.金刚石用于裁玻璃

C.铜作导线                     D.干冰作制冷剂

2物质燃烧伴随有许多现象,下列关于燃烧现象的描述,正确的是(C)

A.硫在氧气中燃烧发出淡蓝色的火焰

B.红磷在空气中燃烧发出蓝紫色火焰

C.镁条在空气中燃烧发出耀眼的白光

D.铁丝在空气中剧烈燃烧,火星四射

3下列物质中,属于纯净物的是(B)

A.雨水    C.糖水  B.铁水   D.海水

4实验室制取CO,有以下步骤:①连接好装置;②向试管中小心放入几小块石灰石;③向试管中小心注入适量稀盐酸;④检查装置的气密性;⑤收集产生的气体;⑥用燃烧的木条检验集气瓶是否收集满CO2,以上操作按由先至后的顺序排列正确的是(B)

A.①②③④⑤⑥   C.①③②④⑤⑥

B.①④②③⑤⑥   D.③①②④⑤⑥

5.“结构决定性质,性质决定用途”。

“页岩气”是未来能源的“新宠”,其主要成分是甲烷(CH4),铁是冶炼最多的金属。请回答下列问题请回答下列问题:

(1)用活性炭去除水中的色素和异味,主要应用了活性炭的吸附性。

(2)甲烷中碳元素与氢元素的质量比是3:1;

(3)甲烷燃烧需要的条件是:与氧气接触和达到着火点_。

(4)工业炼铁主要反应的化学方程式是,反应中的氧化剂是Fe2O3。该反应中所涉及的物质中,属于单质的是Fe_。常用于灭火的是CO2。

(5)铜是人类利用较早的金属,木炭与氧化铜反应生成二氧化碳的化学方程式,反应后固体的质量减小。(填“增大”、“减小”或“不变”)

6. 物质的性质很大程度上决定物质的用途。请从下列物质中选择合

适的数字序号填空(每空只填一个数字序号):

①熟石灰②石墨③干冰④甲烷⑤氢气 ➅二氧化硫。

(1)常用作干电池电极的是② ;(2)农业上用来改良酸性土壤的是①

(3)沼气的主要成分是④;          (4) 用来人工降雨的是③;

(5)用作高能、无污染燃料的是⑤; (6) 排放到空气中形成酸雨的是

7.氧气是化学性质比较活泼的气体之一,实验室制取氧气大致可分为下列步骤:①点燃酒精灯,加热试管。②检查装置的气密性。③将高锰酸钾装入试管,塞入一小团棉花,用带导管的橡皮塞塞紧试管,并把试管固定在铁架台上。④用排水法收集氧气。⑤熄灭酒精灯。⑥将导管从水槽中取出。正确的操作顺序为②③①④⑥⑤

8. 自然灾害常常致使当地原有水源被破坏,寻找到的新水源需经检测和处理后,才能成为饮用水。

(1)新水源中的泥沙经静置后,通常可以通过过滤(填操作名称)将其除去。水中难闻的异味,可添加活性炭除去,这是利用了活性炭的吸附性。

(2)经过净化后的水,还可以通过煮沸方法,降低水的硬度。

(3)请写出日常生活中节约水资源的具体措施洗脸水浇花(任写一条)。

9.下面是实验室制取气体及气体性质试验装置图。请回答下列问题:

(1)写出图中有标号仪器的名称:a长颈漏斗 ;b酒精灯

(2)实验室可用加热高锰酸钾来制取氧气,其反应的化学方程式为,

收集方法为C或E_。

(3)如图G,铁丝在氧气中剧烈燃烧火星四射,生成黑色固体,而瓶底预先放入少量水的目的是防止集气瓶被烧裂。

初中化学:溶液,溶解度与溶解度曲线运用

初中化学:溶液的浓度

初中化学:溶液重难点复习(1)

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  1. CONNECT:[ UseTime:0.000440s ] mysql:host=127.0.0.1;port=3306;dbname=b_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000590s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100689s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100556s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000796s ]
  6. SELECT * FROM `set` [ RunTime:0.100534s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000715s ]
  8. SELECT * FROM `article` WHERE `id` = 465771 LIMIT 1 [ RunTime:0.100622s ]
  9. UPDATE `article` SET `lasttime` = 1770354789 WHERE `id` = 465771 [ RunTime:0.255869s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000753s ]
  11. SELECT * FROM `article` WHERE `id` < 465771 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005387s ]
  12. SELECT * FROM `article` WHERE `id` > 465771 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.020899s ]
  13. SELECT * FROM `article` WHERE `id` < 465771 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017255s ]
  14. SELECT * FROM `article` WHERE `id` < 465771 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016917s ]
  15. SELECT * FROM `article` WHERE `id` < 465771 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010631s ]
0.801440s