Physical and chemical reactions are two important changes of states in reactions. They have often used terms in science. It is very vital to understand the difference between the two reactions. Sometimes the classification of the reactions is real tricky, they don’t fall in the either category, they are a mix-up of both the reactions but most of them could be characterized. The physical reaction leads to a physical change of the substance whereas chemical reaction will lead the substance to change its properties chemically. Chemical changes will occur a change in the substance on the molecular level whereas physical changes the appearance of the substance. Physical reactions are also termed as physical reactions whereas chemical reactions are also termed as chemical reactions. Physical changes do not change the composition of the substance normally whereas in chemical reactions molecules react chemically to change the composition of the substance chemically.
What is Physical Reactions?
Substances are rearranged on the molecular level and they are forced to change their states and substance is physically changed and it undergo physical reaction. It should be kept in mind that molecules do not react in physical reactions and they are not chemically changed. Their chemical composition remains the same, they only alter their arrangements to undergo physical changes. Physical change is the result if the change which does not affect its chemical composition. Physical changes are normally reversible changes, they can get back to its original position by ordering their arrangement again. Generally physical reactions result in the formation of the new substance, for example, consider the example of freezing of water, it results into ice. physically substance is changed, but on a molecular level only they are ordered in such a way to change substance appearance. Physical changes change the appearance, they result in the change in the temperature, size, shape and sometimes the texture of the substances. Physical reactions also result in states of the substance which consequently change the melting point and the boiling point of the substance. Usually, a modification of an actual physical property, for example, shine, malleability, size, volume level, solubility, denseness, viscosity, etc. referred to as an actual physical modification. Numerous physical alterations additionally include the particular rearrangement associated with atoms many significantly within the development regarding crystals. In addition to melting and freezing point, physical reactions also change the vaporization, condensation and sublimation of the substances. Some important physical reactions are given below.
- freezing of water into ice
- melting of an ice cube
- evaporation of volatile substances
- dry ice sublimation into vapours
- the dissolving of solute into the solvent
- chopping of fruit
What is Chemical Reactions?
A chemical reaction can be described as a procedure that brings about the particular conversion process of one particular group of chemical compounds to an alternative. Commonly, chemical reactions consist of transformations that just include the positions associated with electrons within the developing as well as splitting of compound bonds in between atoms, without having any alteration to the particular nuclei, and possibly be explained a substance formula. The compound or substances in the beginning associated with a chemical reaction are known as reactants as well as reagents. Chemical reactions are generally described as a chemical change, and so they produce more than one products, which in turn possess qualities distinctive from the reactants. Reactions frequently encompass a series associated with individual sub-steps, the particular so-called primary reactions, and also the information regarding the particular method belongs to the response system. Chemical reactions happen to be referred to together as chemical equations, which usually symbolically provide the beginning materials, conclusion products, and in some cases more advanced intermediate products as well as reaction situations. Chemical reactions take place with a characteristic reaction pace with a offered temperatures as well as chemical attentiveness. Normally, reaction rates improve together with escalating temperatures since there is a lot more thermal vitality accessible to get to the triggering energy essential for splitting bonds in between atoms. Few examples of chemical reactions are given below.
- boiling of an egg
- baking pizza
- fireworks explosion
- corrosion of iron
- metabolism process
Key Differences between Chemical Reaction and Physical Reaction
- In physical reaction substance remains the same before the happening of reaction and after the happening of reaction whereas in chemical reaction substance is changed
- In physical reaction change produced can be altered into the previous form whereas this is not possible in chemical reaction
- Physical reaction is reversible whereas chemical reaction is irreversible
- In physical reaction, there is no change on the molecular level whereas chemically molecules are reacted in the chemical reaction
- In physical reaction normally a new substance is formed whereas in chemical reaction one or more new substances are produced