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2026年中考化学必备知识点清单,电子版可下载打印!

2026年中考化学必备知识点清单,电子版可下载打印!

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2026年中考化学必备知识点清单,电子版可下载打印!

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必背点 常见气体的制备

1)制取氧气:①实验室制氧气2KMnO4 △ K2MnO4MnO2O2A2H2O2 MnO2H2OO2或 或 D必考二选一②电解水制氧气2H2O通电2H2O22)制取二氧化碳:CaCO32HCl CaCl2CO2H2O或 或 D必考3)制取氢气:ZnH2SOZnSO4H2或 或 D

必背点 有二氧化碳参与的反应

1)与氢氧化钠溶液反应用氢氧化钠溶液吸收 CO2氢氧化钠变质2NaOHCONa2CO3H2O必考2)与氢氧化钙溶液反应检验 CO2用石灰浆粉刷墙壁,干燥后变硬CO2CaOHCaCO3H2O必考3)与水反应正常雨水偏弱酸性的原因CO2H2O H2CO34)与碳反应为冶炼金属提供原料CO2C高温2CO

必背点 有氧气参与的反应

1)红磷燃烧测定空气中氧气含量 4P5O2点燃2P2O5第1页,共45页2)碳充分燃烧 CO2点燃CO2碳不充分燃烧 2CO2点燃2CO3)硫的燃烧 SO2点燃SO24)铁在氧气中燃烧 3Fe2O2点燃Fe3O45)氢气燃烧氢气用作燃料 2H2O2点燃2H2O6)与铝反应常温下铝耐腐蚀的原因 4Al3O2Al2O3注意简答7)一氧化碳燃烧一氧化碳用作燃料 2COO2点燃2CO28)天然气(或甲烷)燃烧天然气(或甲烷)用作燃料 CH+ 2O2点燃CO+ 2H2O9)酒精(或乙醇)燃烧酒精(或乙醇)用作燃料 C2H5OH + 3O2点燃2CO+ 3H2O必考二选一

必背点 有金属氧化物参与的反应

1.金属的冶炼金属氧化物与还原剂的反应一氧化碳前面的化学计量数等于氧化物中 的氧原子数。必考!)1)一氧化碳还原赤铁矿(主要成分为氧化铁) 3COFe2O3高温2Fe3CO22)一氧化碳还原磁铁矿(主要成分为四氧化三铁) 4COFe3O4高温3Fe4CO23)一氧化碳还原氧化铜 COCuO△ CuCO24)氢气还原氧化铜 H2CuO△ CuH2O5)碳还原氧化铜 C2CuO高温2CuCO22.金属氧化物与稀酸的反应 属于复分解反应铁元素的化合价没有变化!)1)氧化铁和稀盐酸反应稀盐酸除铁锈 Fe2O36HCl 2FeCl33H2O2)氧化铁和稀硫酸反应稀硫酸除铁锈 Fe2O33H2SOFe2SO433H2O3)氧化铜和稀盐酸反应 CuO2HCl CuCl2H2O4)氧化铜和稀硫酸反应 CuOH2SOCuSO4H2O第2页,共45页 更多资料加微信:13304227必背点 金属与酸、盐溶液的反应均属于置换反应1.金属与酸的反应1)镁与稀盐酸反应 Mg2HCl MgCl2H22)镁与稀硫酸反应 MgH2SOMgSO4H23)铝与稀盐酸反应 2Al6HCl 2AlCl33H24)铝与稀硫酸反应 2Al3H2SOAl2SO433H25)铁与稀盐酸反应 Fe + 2HCl FeCl2H26)铁与稀硫酸反应 FeH2SOFeSO4H2在化合物中铁元素为7)锌与稀盐酸反应 Zn2HCl ZnCl2H2生成氢气的质量=参加反应的金属的质量 金属的单价原子量金属的单价原子量=金属的相对原子质量 金属的化合价不与酸反应的物质(如铜、碳等),单价原子量定义为无穷大MMg(单)24 2 12 MAl(单)27 3 9MZn(单)65 2 32.MFe(单)56 2 282.金属与盐溶液的反应[差量法物质固体和溶液之间质量的变化]1)锌与硫酸亚铁溶液反应 ZnFeSOZnSO4Fe 65←→56) (2)锌与硝酸亚铁溶液反应 ZnFeNO3FeZnNO3265←→56) (3)锌与硫酸铜溶液反应 ZnCuSOZnSO4Cu65←→64) (4)锌与硝酸银溶液反应 Zn2AgNOZnNO322Ag65←→216) (5)铁与硝酸铜溶液反应 FeCuNO3FeNO32Cu56←→64) (6)铁与硫酸铜溶液反应不能用铁制品盛装波尔多液的原因 FeCuSOFeSO4Cu56←→64) (7)铁与硝酸银溶液反应 Fe2AgNOFeNO322Ag 56←→216) (8)铜与硝酸银溶液反应 Cu2AgNOCuNO322Ag64←→216必背点 酸、碱、盐之间的反应(均属于复分解反应,酸碱中和反应的实质:HOH- H2O

1.酸与碱的反应中和反应

1)氢氧化钠溶液和稀盐酸反应 NaOHHCl NaClH2O2)氢氧化钠溶液和稀硫酸反应 2NaOHH2SONa2SO42H2O3)氢氧化钙溶液和稀盐酸反应 CaOH22HCl CaCl22H2O4)氢氧化镁和稀盐酸反应治疗胃酸过多 MgOH22HCl MgCl22H2O5)氢氧化铝和稀盐酸反应治疗胃酸过多 AlOH33HCl AlCl33H2O2.碳酸盐与酸的反应1)碳酸钠溶液和稀盐酸反应 Na2CO32HCl 2NaClCO2H2O2)碳酸钠溶液和稀硫酸反应 Na2CO3H2SONa2SO4CO2H2O3)碳酸钙和稀盐酸反应 CaCO32HCl CaCl2CO2H2O必考4)碳酸氢钠溶液和稀盐酸反应治疗胃酸过多 NaHCO3HCl NaClCO2H2O5)碳酸镁和稀盐酸反应治疗胃酸过多 MgCO32HCl MgCl2CO2H2O3.酸、碱、盐之间有沉淀生成的反应CaCO3BaCO3均不溶于水均能溶于酸1)生成碱沉淀[MgOH2CuOH2]的反应 ①氯化镁溶液和氢氧化钠溶液反应 MgCl22NaOH MgOH22NaCl②硫酸铜溶液和氢氧化钠溶液反应 CuSO42NaOH CuOH2Na2SO42)生成碳酸盐沉淀(CaCO3BaCO3)的反应 ①碳酸钠溶液和氯化钙溶液反应 Na2CO3CaClCaCO3+2NaCl②碳酸钠溶液和氯化钡溶液反应 Na2CO3BaClBaCO3+2NaCl必考③碳酸钠溶液和硝酸钡溶液反应 Na2CO3BaNO3BaCO32NaNO3④碳酸钠溶液和氢氧化钙溶液反应(工业上制取氢氧化钠) Na2CO3CaOHCaCO32NaOH必考3)生成 AgClBaSO4沉淀的反应(AgClBaSO4均不溶于水,也不溶于酸) ①硫酸钠溶液和氯化钡溶液反应 Na2SO4BaClBaSO42NaCl②硫酸钠溶液和氢氧化钡溶液反应 Na2SO4BaOHBaSO42NaOH③硝酸银溶液和稀盐酸反应 AgNO3HCl AgCl↓HNO3第4页,共45页 更多资料加微信:13304227④硝酸银溶液和氯化钠溶液反应 AgNO3NaCl AgCl↓NaNO3⑤硫酸锌溶液和硝酸钡溶液反应 ZnSO4BaNO3BaSO4ZnNO324)常见的双.沉.淀.反.应. BaOH2CuSOBaSO4CuOH2

必背点 优先反应原理"挤牙膏"理解优先反应原理1.金属和盐溶液的优先反应1)金属与混合盐溶液的反应,金属优先与不活泼金属的盐溶液反应。 举例:将一定量的铁粉加入硝酸铜和硝酸银的混合溶液中。 先:Fe2AgNOFeNO322Ag 后:FeCuNO3FeNO32Cu2)金属混合物和盐溶液的反应,金属活动性较强的金属优先与盐溶液反应。 举例:将铁和铜的混合物加入硝酸银溶液中。 先:Fe2AgNOFeNO322Ag 后:Cu2AgNOCuNO322Ag2.酸、碱、盐之间的优先反应1H优先与 OH发生反应(或 OH优先与 H发生反应)。 举例 1:将 NaOH 溶液加入 CuSO4和 H2SO4的混合溶液中。 先:2NaOHH2SONa2SO42H2后:2NaOHCuSONa2SO4CuOH2举例 2:将盐酸加入 NaOH 和 Na2CO3的混合溶液中。 先:NaOHHCl NaClH2后:Na2CO32HCl 2NaClCO2H2O2)碳酸盐和混合溶液的反应:CO3 2- 优先与 H发生反应。 举例:将碳酸钠溶液加入氯化钙和稀盐酸的混合溶液中。 先:Na2CO32HCl 2NaClCO2H2后:Na2CO3CaClCaCO32NaCl特别提醒将稀硫酸加入 NaOH 和 BaNO32的混合溶液中由于 H只发生一个化学反应所以 不存在先后顺序生成沉淀和酸碱中和是两个独立的过程反应开始两个反应同时发 生。3)金属与酸反应时,金属活动性较强的金属优先反应,如将锌、铁合金投入稀盐酸 中,锌优先与稀盐酸反应。

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  1. CONNECT:[ UseTime:0.000878s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001846s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000750s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000734s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001319s ]
  6. SELECT * FROM `set` [ RunTime:0.000658s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001602s ]
  8. SELECT * FROM `article` WHERE `id` = 560875 LIMIT 1 [ RunTime:0.001097s ]
  9. UPDATE `article` SET `lasttime` = 1777257614 WHERE `id` = 560875 [ RunTime:0.001598s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000707s ]
  11. SELECT * FROM `article` WHERE `id` < 560875 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001398s ]
  12. SELECT * FROM `article` WHERE `id` > 560875 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001293s ]
  13. SELECT * FROM `article` WHERE `id` < 560875 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002087s ]
  14. SELECT * FROM `article` WHERE `id` < 560875 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002166s ]
  15. SELECT * FROM `article` WHERE `id` < 560875 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002518s ]
0.209566s