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Na2CO3

This equation is an important organic chemical raw material called sodium carbonate. It is used in daily life glass products, etc., and it is also widely used in daily life washing, etc.

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Formula
6 CO₂ + 6 H₂O + light → C​₆H₁₂O₆ + 6 O2
This is a reaction of photosynthesis.
Plants apply a chemical reaction called photosynthesis to convert carbon dioxide and water into food (glucose) and oxygen. It's one of the most common everyday chemical reactions and also one of the most important because this is how plants produce food for themselves and animals and convert carbon dioxide into oxygen.
Citation: https://www.nationalgeographic.org/encyclopedia/photosynthesis/

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Formula
KMnO₂ →K₂MnO₂+MnO₂+O2
This is a reaction of glucose and oxygen

This is the reaction of making oxygen with potassium permanganate in the laboratory. The catalyst is manganese dioxide.
What is a catalyst? Is catalyst a reactant?

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Formula
C6H12O6+6O2==6CO2+6H2O+energy

This is respiration

Respiration is the chemical reaction between organic matter (usually glucose) and oxygen in the body.

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Formula
C6H12O6 → 2C2H5OH + 2CO2 + energy

Anaerobic respiration allows cells to obtain energy from complex molecules in an anaerobic environment. Through anaerobic respiration, yeast and bacteria fermentation will produce ethanol, carbon dioxide and other chemicals, making delicious cheese, wine, beer, yogurt, bread and other delicacies.

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The process of photosynthesis refers to the process by which the autotrophs tend to manufacture their food It is one of the
natural chemical reactions in everyday life. In the presence of chlorophyll and sunlight, the plants produce glucose in the
form of energy from water and carbon dioxide from the environment
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

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formula
CuSO4+Fe=Cu+FeSO4

To change a metal from a compound to a free state. The metal is extracted by the addition of other substances to produce a substitution reaction.

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Formula
C6H12O6 + 6O2 → 6CO2 + 6H2O

This is a reaction of glucose and oxygen

This is the process of the glucose fermentation.  This could include in the oxidation reaction from chemical reaction.

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Formula

4Fe + 3O2 → 2Fe2O3

This chemical formula represents the reaction between iron and oxygen, and also represents the production of rust. The chemical reaction between iron and oxygen is a synthesis reaction.

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Formula
CaCO3→ CaO+CO2

This is a decomposition reaction

This is the method of producing carbon dioxide in industry. This chemical method produces carbon dioxide faster and at a lower cost. Carbon dioxide has many uses. It is often used to make soft drinks and alcoholic beverages. It is also an important condition for plants to carry out photosynthesis.(Rear)

Work Cited
Rear, Jack. “How Is CO2 Produced Commercially and Why Are We Short of It? | Verdict.” Verdict, 28 June 2018, www.verdict.co.uk/how-is-co2-produced-commercially-shortage/.

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Formula:
C6H12O6 +6O2→6CO2 + 6H2O + Energy (ATP)

This is a double replacement reaction

It is the most basic level of metabolism in all living things, and the overall equation for cellular respiration says that glucose plus six oxygen molecules react to form six carbon dioxide molecules plus six water molecules plus ATP (or energy)(Biology 20 Cellular Respiration).

Biology 20 Cellular Respiration. www.saddleback.edu/faculty/steh/bio20folder/bio20lectho/bio20cellularrespiration0210.pdf.

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Formula:
4Fe + 3O₂ → 2Fe₂O3

This is synthesis reaction

Rusting of iron (生锈)
It's sometimes used as a polishing compound for jewelry and lenses, and it sees some use in polishing blades. It's also used in calamine lotion.(“Does Iron Rust”)

Work Cited

“Does Iron Rust Have Any Practical Use? - Quora.” Www.quora.com, www.quora.com/Does-iron-rust-have-any-practical-use. Accessed 24 Mar. 2021.