All the chemical reactions in Grade Three Chemistry

Answer 1

1. ** Combination reaction **
- ** Magnesium burns in the air **: It burns violently, emitting a dazzling white light, forming a white solid and releasing heat.
- ** Iron burns in oxygen **: It burns violently, sparks fly, forming a black solid and releasing heat.
- ** Copper is heated in the air **: The surface of the copper wire turns from red to black.
- ** The burning of aluminum in the air: The silver-white metal becomes a white solid and emits heat. The corrosion resistance of aluminum is due to the formation of a dense aluminum dioxide film on the surface, which prevents the internal aluminum from continuing to be oxided.
- ** Burning of hydrogen in the air **: Light blue flames are produced, heat is released, and mist appears on the inner wall of the beaker.
- ** Mercury and oxygen react **: The silver-white liquid forms a red solid.
- ** Burning of carbon in oxygen **: Burning violently, emitting white light and heat, turning clear lime water turbid.
- Sulfur burns in the air, emitting a faint light blue flame, releasing heat and producing a pungent gas; burning in oxygen is a bright blue-purple flame.
- ** Phosphorous burns in the air **: It burns intensely, producing a large amount of white smoke. It releases heat and forms a white solid.
- ** Sulfur combustion **: produces blue flames, releases heat, and produces gas and water that turn lime water turbid.
2. ** Dissociation reaction **
- ** Heat decomposition of potassium pernate **: Generates a gas that rekindles the wood with sparks.
- ** Permanganate decomposed by heat **: purple turned black, producing a gas that rekindled the spark wood.
- ** Heat decomposition of mercury dioxide **: The red color turns into silver, producing a gas that rekindles the wood with sparks.
- ** Electro-water breakdown **: Water is broken down into hydrogen and oxygen.
- ** Pyrolyzed basic copper carbonate **: Green turned black, liquid formed on the test tube wall, producing gas that turned the lime water turbid.
- ** Heat decomposition of the hydrogen carbonates **: The white solid disappears, and there is liquid on the tube wall, producing a gas that makes the lime water turbid.
- ** Heat decomposition of NaHCO3 **: It produces gas that turns clear lime water turbid.
- High temperature decomposition of calcium carbonate-it is used in the industry to produce carbon dioxide and quicklime.
3. ** Substitution Reaction **
- ** Reaction between the acid and the metal **: A large number of bubbles will be generated, and the metal particles will gradually dissolve.
- ** Reaction of iron and sulfuric acid **: A large number of bubbles will be produced, and the metal particles will gradually dissolve.
- ** Reaction of Magnesium and Sulfuric Acid **: A large number of bubbles are produced, and the metal particles gradually dissolve.
- ** Reaction between aluminum and sulfuric acid **: A large number of bubbles are produced, and the metal particles gradually dissolve.
- [** Iron Oxides Reducted by hydrogen **: The red color gradually turns into a silver-white color, and there is liquid on the wall of the test tube.]
- ** Iron Ferric Oxides Reducted by hydrogen **: The black color gradually turned silver-white, and there was liquid on the wall of the test tube.
- ** Reaction of iron and copper sulfuric acid **: blue deposit is formed, and the upper part is a clear solution.
4. ** Metathesis reaction **
- ** Reaction of calcium carbonate and sulfuric acid **: The solid gradually melts, and there is a gas that makes the clear lime water turbid. It can be used to prepare carbon dioxide and remove scale in the laboratory.
- ** Reaction of soda ash and sulfuric acid **: The solid will gradually dissolve, and there will be gas that will make the clarified lime water turbid. This is the principle of foam fire extinguisher.
5. ** Other reactions **
- ** Reaction of carbon dioxide and water **: The carbolic acid turns the litmus red, which proves the acidic nature of carbolic acid. The red color of the litmus fades when the carbolic acid is decomposed.
- ** Reaction of carbon dioxide and calcium dioxide **: Clear lime water becomes turbid, used to test carbon dioxide and lime paste for painting walls.
- [Reaction of CaCl3, water and carbon dioxide: The white deposit gradually dissolved, which is related to the formation of karst caves and the weathering of rocks.]
- ** decomposition reaction of calcium hydrogen carbonat **: A gas that produces white precipitations and makes clear lime water turbid. It is related to the formation of scale and stalactites.
- [** Burning of carbon dioxide **: blue flames are produced.]
- ** Copper oxide-reduction by carbon **: The black color gradually turns red, producing a gas that turns the clear lime water turbid. It is used to smelt metals.
- ** Iron Oxides Reducted by Coal **: Used to smelt metals.
- [** carbon reduction of Fe3O4 **: Used to smelt metals.]
- ** Reaction between Na and water **: The reaction is intense. Na floats on the surface of the water and quickly melts into a shiny ball. It swims around on the surface of the water and makes a "hissing" sound. (If the reference material does not mention the reaction of Na with water, this is supplementary content.)