In physical phenomena, there is a change in the energy or position of a system . It may be that there are external agents that influence it or that it reaches a new state by itself. These are processes such as movement, heating, cooling, mechanical work, forces, free fall and any deformation of the geometric shape of a body, for example.
In physical phenomena, matter maintains its composition as is, without being altered. It can be finely divided, or its physical state changed, but it is still the same substance. These processes occur in the universe at all scales, from subatomic particles to galaxies. They are constant , they never stop because the balance is changing.
There will always be an interaction between matter and energy through space where they are affecting each other, always reaching a final balance. For example, when a ball is thrown upward, it will decelerate to a point of zero velocity at a certain height. Then, due to the action of the gravitational field, it will descend in free fall until it returns to the ground.
Among the physical phenomena, are:
- Free fall
- Uniform rectilinear motion
- Uniformly accelerated motion
- Circular motion
- Mechanical work
- The warm-up
- The flow of substances
- Atmospheric pressure
In chemical phenomena, matter is altered to different substance . This is due to the interaction of two or more different types of matter that enter into a chemical reaction. This process can be spontaneous and effortless, or generated by the influence of other factors that are in the environment of the system.
Chemical phenomena, as well as physical ones, occur in every part of the universe, ranging from the functioning of cells to the nutrition of plants. Any container where a chemical phenomenon occurs is called a chemical reactor . Thus, it is concluded that planet Earth is itself a reactor, in turn with many reactors and reactions occurring within it.
In each of these processes, there is an exchange of energy and a restructuring of the substances involved. It should be noted that there will always be the same amount of matter at the beginning and at the end of a chemical phenomenon, in accordance with the principle of conservation of matter: “ Matter is neither created nor destroyed, it only transforms .”
Among the chemical phenomena are:
- Acid-base neutralization
- The combustion
- The reduction
- The breathing
- Cooking the food
- Fermentation of barley
- The fermentation of the grape
20 examples of physical and chemical phenomena
10 examples of physical phenomena
- The force of gravity of the planets exerts an attractive force between the planet and other bodies. This phenomenon occurs in bodies that have a large amount of matter.
- The translational movement of the planet that causes the changes of season.
- When there are pressure changes and certain degrees of humidity in the atmosphere, tornadoes occur.
- The attractive force that exists between two magnets, called the magnetic force.
- The transmission of radio waves that allow sound to be transferred and reproduced at a distance by means of a receiving device.
- The free fall of a fruit that emerges from a tree.
- The acceleration of a gear in a mechanism.
- The pressure of atmospheric gases on the earth’s surface.
- The cooling of water vapor on an icy surface, where it condenses.
- Heating a liquid to its boiling point.
10 examples of chemical phenomena
- The conversion of hydrogen to helium that makes the sun burn.
- The oxidation that iron undergoes in the open.
- The generation of vital energy carried out by living beings from the metabolism of food.
- The bioluminescence that some living beings produce to generate light.
- The combustion of gasoline inside an engine, through which gasoline is converted to carbon monoxide and oxygen from the explosion produced by the passage of an electric spark in an environment saturated with gasoline vapor.
- The catalysis of the hydrogenation of organic compounds by means of platinum.
- The oxidation of sulfur dioxide SO 2 to sulfur trioxide SO 3 .
- The fermentation of grapes to produce wine.
- The conversion of carbon dioxide CO 2 and water H 2 O into glucose C 6 H 12 O 6 through photosynthesis.
- When food is fried in oil, it comes off, it becomes dehydrogenated.