world around us, with all its richness and diversity, living by the laws that are fairly easy to explain with the help of sciences such as physics and chemistry.And even in the heart of a complex organism such as a man is not nothing but a chemical phenomena and processes.
Definitions and examples
elementary example - tea, put on fire.After some time the water begins to warm up, then boil.We hear a hiss from the bottle kettle will fly jets of steam.Where did he come, because his dish was not originally!Yes, but the water at a certain temperature, begins to turn into gas, changes its physical state from liquid to gas.Ieit remains all the same water, but now in the form of steam.This physical phenomenon.
A chemical phenomena, we will see if the drop in boiling water bag of tea brewing.The water in a glass or other vessel, painted in red-brown color.There will be a chemical reaction: due to heat tea leaves will zaparivatsya highlighting color pigments and flavor inherent in this plant.We get new stuff - a drink with the specific, peculiar only to him qualitative characteristics.If there is to add a few spoonfuls of sugar, it dissolves (physical reaction) and become sweet tea (chemical reaction).Thus, physical and chemical processes are often related and interdependent.For example, if the same tea bag placed in cold water, the reaction will not happen, tea leaves and water do not interact, and sugar also does not wish to dissolve.
Thus, the chemical phenomena - are those in which some substances are transformed into other (water in the tea, water syrup, firewood ash, etc.) Otherwise, the chemical phenomenon is called a chemical reaction.
called Physical phenomena in which the chemical composition of the substance remains the same, but changes the aggregate state, body size, shape, etc.(deformed spring water, a frozen into ice, tree branches, broken in half).
terms of appearance and process
About occur if chemical and physical phenomena, we can tell there are signs and changes that occur in a particular body or substance.Thus, the majority of chemical reactions accompanied by the following 'identification marks »:
- a result of or during the flow of such a precipitate;
- color change agent;
- gas can be released, such as carbon monoxide during combustion;
- is absorbed or, conversely, heat release;
- to emit light.
to chemical phenomena have been observed, ieThe reaction takes place, certain conditions are necessary:
- reactants come into contact, to be with each other in contact (ie, the same tea leaves need to pour into a mug of boiling water);
- substances better grind, then the reaction will proceed faster, more will come interaction (sugar soon dissolved, melted in hot water than the lump);
- to many reactions could happen, it is necessary to change the temperature regime of the reactants, cooling or heating them up to a certain temperature.
Watch the chemical phenomena can be empirically.But describe it on paper can be by chemical equation (equation chemical reaction).
Some of these conditions and work for the emergence of physical phenomena, such as changes in temperature or direct contact of subjects, bodies among themselves.For example, if hit hard enough with a hammer on the nail head, it can be deformed to lose its normal shape.But it will remain a nail head.Alternatively, when the light bulbs in the network, a tungsten filament inside it starts to warm up and glow.However, the substance of which the thread is made, and will remain the same tungsten.
description of physical processes and phenomena occur through physical formula, the solution of physical problems.
