1. Magnesium bar burns in the air: emits dazzling strong light, emits a lot of heat, generates white smoke and generates a white substance at the same time.
2. Charcoal burns in oxygen: emits white light and emits heat.
3. Sulfur burns in oxygen: emits a bright blue-violet flame, releases heat, and generates a pungent gas.
4. The iron wire burns in oxygen: it burns violently, sparks radiate, release heat, and generate black solid matter.
5. Heating ammonium bicarbonate in the test tube: irritating odor gas is generated, and droplets are generated on the test tube.
6. Hydrogen burns in the air: the flame appears light blue.
7. Hydrogen burns in chlorine gas: it emits pale flame and generates a lot of heat.
8. Reduce copper oxide with hydrogen in the test tube: black copper oxide becomes a red substance, and droplets are generated at the test tube mouth.
9. Reduce the copper oxide powder with charcoal powder to make the generated gas pass into the clear lime water, the black copper oxide becomes shiny metal particles, and the lime water becomes turbid.
10. Carbon monoxide burns in the air: emits a blue flame and releases heat.
11. Add hydrochloric acid dropwise to a test tube containing a small amount of potassium carbonate solid: gas is generated.
12. Heat the copper sulfate crystals in the test tube: the blue crystal gradually turns into a white powder, and droplets are generated at the mouth of the test tube.
13. Sodium burns in chlorine gas: it burns violently to form a white solid.
14. Light the pure chlorine gas and cover it with a dry and cold beaker: a light blue flame is emitted, and droplets are formed on the inner wall of the beaker.
15. To the C1-containing solution was added dropwise silver nitrate acidified with nitric acid, and a white precipitate formed.
16. A barium chloride solution acidified with nitric acid was added dropwise to the solution containing SO42-, and a white precipitate formed.
17. Put a rusty iron nail into a test tube containing dilute sulfuric acid and heat: the rust gradually dissolves, the solution is light yellow, and gas is generated.
18. Add sodium hydroxide solution dropwise to the copper sulfate solution: a blue flocculent precipitate is generated.
19. Introduce Cl2 into the colorless KI solution, there is a brown substance in the solution.
20. Sodium hydroxide solution was added dropwise to the ferric chloride solution: a reddish brown precipitate formed.
21. Add a small amount of water to the test tube containing quick lime: the reaction is violent and emits a lot of heat.
22. Immerse a clean iron nail in the copper sulfate solution: the surface of the iron nail is attached with a red substance, and the color of the solution gradually becomes lighter.
23. Insert the copper sheet into the mercury nitrate solution: there is a silver-white substance on the surface of the copper sheet.
24. Into the test tube filled with lime water, inject concentrated sodium carbonate solution: white precipitate formed.
25. Fine copper wire is burned in chlorine gas and water is added: brown smoke is generated, and green solution is formed after water is added.
26. Mixed gas of hydrogen and chlorine irradiated by strong light: rapid reaction and explosion.
27. Red phosphorus burns in chlorine gas: white smoke is generated.
28. Chlorine gas encounters a wet colored cloth strip: the color of the colored cloth strip fades.
29. Heating the mixture of concentrated hydrochloric acid and manganese dioxide: a yellow-green pungent odor gas is generated.
30. Heating the mixture of sodium chloride (solid) and sulfuric acid (concentrated): a fog is generated and a pungent odor is generated.
31. Add silver nitrate solution dropwise to the sodium bromide solution and then add dilute nitric acid: a pale yellow precipitate is formed.
32. After adding the silver nitrate solution dropwise to the potassium iodide solution and then adding dilute nitric acid: a yellow precipitate forms.
33. I2 meets starch and produces a blue solution.
34. The thin copper wire burns in sulfur vapor: after the thin copper wire becomes red, a black substance is formed.
35. The iron powder and sulfur powder are mixed and heated to a red heat: the reaction continues, and a lot of heat is released, producing a black substance.
36. Hydrogen sulfide gas does not burn completely (cover the flame with an evaporating dish): the flame is light blue (yellow powder on the bottom of the evaporating dish).
37. The hydrogen sulfide gas is completely burned (the flame is covered with a dry and cold beaker): the flame is light blue, and a pungent gas is generated (droplets are generated on the inner wall of the beaker).
38. Mix hydrogen sulfide and sulfur dioxide in the gas cylinder: yellow powder is generated on the inner wall of the cylinder.
39. Sulfur dioxide gas is introduced into the magenta solution and then heated: the red color is withdrawn and after heating it returns to its original color.
40. Excess copper is put into a test tube containing concentrated sulfuric acid and heated, and the reaction is completed. After the solution is cooled, add water: a pungent odor gas is generated, and the solution is sky blue after adding water.
41. Heating a test tube containing concentrated sulfuric acid and charcoal: gas is generated, and the gas has a pungent odor.
42. Sodium burns in the air: the flame is yellow, producing a light yellow substance.
43. Sodium is poured into water: the reaction is intense, the sodium floats on the surface of the water, and a large amount of heat is released to dissolve the sodium into a small ball moving on the surface of the water, and there is a "chattering" sound.
44. Drop water into a test tube containing solid sodium peroxide, and extend the strip with Mars into the mouth of the test tube: the strip re-ignites.
45. Heat the solid sodium bicarbonate to pass the generated gas into the clear lime water: the clear lime water becomes turbid.
46. ​​Ammonia gas meets hydrogen chloride: a large amount of white smoke is produced.
47. Heating a mixture of ammonium chloride and calcium hydroxide: a gas with a pungent odor is generated.
48. Heating a test tube containing solid ammonium chloride: white crystals are produced at the test tube mouth.
49. The concentrated nitric acid in the colorless reagent bottle is exposed to sunlight: the space in the bottle is brown, and the nitric acid is yellow.
50. Reaction of copper flakes with concentrated nitric acid: the reaction is intense and red-brown gas is produced.
51. Reaction of copper flakes with dilute nitric acid: colorless gas is produced at the lower end of the test tube, and the gas gradually turns into reddish brown.
52. Add dilute hydrochloric acid to the sodium silicate solution, and a white colloidal precipitate occurs.
53. Add magnesium sulfate solution to the ferric hydroxide colloid: the colloid becomes cloudy.
54. Heating the ferric hydroxide colloid: the colloid becomes cloudy.
55. Extend the ignited magnesium bar into the gas cylinder containing carbon dioxide: it burns violently, and a black substance adheres to the inner wall of the gas cylinder.
56. Add ammonia water dropwise to aluminum sulfate solution: generate fluffy white flocculent material.
57. Sodium hydroxide solution was added dropwise to the ferrous sulfate solution: a white flocculent precipitate was formed, which immediately turned to gray-green and then to a reddish brown precipitate.
58. Drop KSCN solution into the solution containing Fe3 +: the solution is blood red.
59. Chlorine water was added dropwise to the sodium sulfide aqueous solution: the solution became cloudy. S2- + Cl2 = 2Cl2- + S ↓
60. Add a small amount of soapy liquid to natural water: the foam gradually decreases and precipitation occurs.
61. Ignite methane in the air and place a dry beaker on the flame: the flame is light blue, and droplets are generated on the inner wall of the beaker.
62. The mixed gas of light methane and chlorine gas: the yellow-green color gradually becomes lighter and takes longer time (droplets are generated on the inner wall of the container).
63. Heat (170 ° C) the mixture of ethanol and concentrated sulfuric acid, and pass the generated gas into bromine water, into acidic potassium permanganate solution: gas is generated, the bromine water fades, and the purple gradually becomes lighter.
64. Ignite ethylene in the air: the flame is bright, black smoke is generated, and heat is released.
65. Ignite acetylene in the air: the flame is bright, dense smoke is generated, and heat is released.
66. Benzene burns in the air: the flame is bright, with black smoke.
67. Ethanol burns in the air: the flame appears light blue.
68. Pass acetylene into bromine water: bromine water fades color.
69. Pass acetylene into the acidic potassium permanganate solution: the purple gradually becomes lighter until it fades.
70. Benzene and bromine react under the condition that iron powder is used as a catalyst: white mist occurs, and the product is oily and brownish.
71. Pour a small amount of toluene into the appropriate amount of potassium permanganate solution and shake: the purple color fades.
72. Put sodium metal into a test tube containing ethanol: gas is released.
73. In a test tube containing a small amount of phenol, drip an excessive amount of concentrated bromine water: a white precipitate is generated.
74. Drop a few drops of ferric chloride solution into the test tube containing phenol and shake: the solution is purple.
75. The reaction of acetaldehyde and silver ammonia solution in the test tube: a layer of bright, mirror-like substance is attached to the inner wall of the clean test tube.
76. When heated to boiling, acetaldehyde reacts with freshly prepared copper hydroxide: a red precipitate forms.
77. Reaction of ethanol and acetic acid under suitable conditions: a transparent scented oily liquid is produced.
78. Protein encounters concentrated HNO3 solution: turns yellow.
79. Purple litmus test solution meets alkali: turns blue.
80. Colorless phenolphthalein test solution meets alkali: turns red.
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