Wind energy is a physical change.
1. Wind power generation
Convert wind kinetic energy into mechanical kinetic energy, and then convert mechanical energy into electrical kinetic energy. generation. The principle of wind power generation is to use wind energy to rotate the blades of the wind turbine, then use a speed multiplier to increase the rotation speed to induce the generator to produce electricity. No other substances are produced during the wind energy production process.
2. Definition of physical change
Physical change refers to changes in the form and state of matter, but the composition of matter itself does not change and no new matter is generated . For example: changes in temperature, position, pressure, volume, shape and mutual transformation between states lliquid, gaseous and solid, etc.
3. Definition of Chemical Change
Chemical change refers to the process of conversion or transfer of atoms or electrons between molecules in contact with each other to generate new molecules accompanied by changes in energy . Its essence is the breaking of old bonds and the formation of new bonds to generate new substances. The fundamental difference between physical changes and chemical changes lies in the generation of new substances.
Examples of physical and chemical changes:
1 Examples of physical changes
There are no new changes in the base. form of matter. Matter is produced, so it is a physical change. Deliquescence of inorganic and alkaline salts such as NaOH, ice melting, bile alum grinding, etc. The flame reaction is a physical change. The flame reactionme is a change in the electronic energy level within the atoms of a substance and does not involve a change in the structure or chemical properties of the substance.
The transformation of some allotropes is a physical change, such as monoclinic sulfur and orthorhombic sulfur. Before and after physical changes, the type, composition and chemical properties of substances remain unchanged. The essence of this type of change is that the state of aggregation of molecules (spacing distance, speed of movement, etc.) has changed, leading to a corresponding change in the shape or state of the substance .
2. Examples of Chemical Changes
Depending on the different types of reactants and products, chemical reactions can be divided into four basic types: combination, decomposition, substitution, and metathesis. Chemical reactions can also be classified from other perspectives, such as lredox reactions and non-redox reactions;