Examples of exothermic reactions in everyday life
A thermochemical reaction shows the conversion of reactants to products with the information of energy change and physical state of the involved species. On the basis of energy change; reaction can be classified in two types.
One is exothermic and another is endothermic reaction. An endothermic reaction is preceded with the absorption of heat by reactant molecules.
The absorption of reactant molecules increases the energy level of product molecules. The absorption of energy by reactant molecules can be shown in the terms of change in enthalpy (ΔH).
For endothermic reactions; the value of change in enthalpy would be +ve otherwise for exothermic reaction; it will be –ve value. This is due to liberation of energy in the form of heat during exothermic reaction.
The energy level of products is less compare to reactant molecules.
Overall an exothermic chemical reaction is described as the evolution of heat during reaction.
The reaction equation can be written as given below;
Reactant molecules → Products + Heat (Energy)
An exothermic reaction is a favourable process as the energy level of product molecules is less compare to reactants.
The less energy helps in the stabilization of molecules.
Hence exothermic reactions are thermodynamically favourable reactions and usually spontaneous in nature. Let’s discuss some common examples of exothermic reaction which we can observe in our everyday life.
The condensation of water vapor in cloud which results the formation of rain water is an example of exothermic reaction. Similarly the cement and concrete setting or setting of epoxy resin is also same type of reactions.
The combustion of fuels such as hydrocarbons results the formation of carbon dioxide gas with water vapor releases a large amount of energy in the form of heat.
The dissolution of organic or inorganic acids in water also liberates some energy which can varies from acid to acid such concentrated H2SO4 releases a large amount of heat while acetic acid is a weak acid which cannot release same amount of heat during formation of aqueous solution. Formation of aqueous solution of anhydrous salts such as anhydrous copper sulphate or calcium chloride also releases some amount of heat in the form of energy.
The mixing of sodium sulphite with bleach or crystallization of liquid salts is also an exothermic reaction.
You must hear about neutralization reaction of acid-base which results the formation of neutral salts is an exothermic reaction.
The amount of heat for this reaction is a constant value which is - 57 kJ mol-1.
The thermite reaction of Al metallurgy and polymerisation reactions for the manufacturing of polymers are also releasing some energy in the form of heat. The oxidation of metals or other organic compounds also an example of exothermic reaction.
The nuclear reaction mainly nuclear fission is an exothermic reaction.
The formation of ice from water or formation of snow, etc. is some of the prominent examples of same type of reaction.
Even the burning of candle is also such type of reaction.
Usually these reactions are spontaneous reactions which do not require any external force to carry out these reactions. But remember these reactions are not always exothermic in nature; can be endothermic also.
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Exothermic - Wikipedia, the free encyclopedia
1 Overview; 2 Examples; 3 Implications for chemical reactions; 4 See also; 5 External links; 6 References ... In an adiabatic system (e.g. a system that does not give off heat to the ... This light is equivalent in energy to the stabilization energy of the energy for the chemical reaction, i.e. the bond energy. ...
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Question:What is the relationship between the temperature of an object and the motion of atoms?
What is the difference between exothermic and endothermic reactions?
What are three exmaples of exothermic reactions in everyday life?
What is the difference between a physical and chemical change?
Answers:1.) Higher the heat, higher agitation of particles (vibration, movement)
2.) Exothermic reactions release heat to the environment, endothermic reactions require heat (absorb heat) in order to react
3.) Any combustion reaction (fuels), Neutralization reactions (acid/base forming salt), most corrosive reactions (including rusting)
4.) Physical changes only change the state (solid/liquid/gas/plasma) Chemical changes alter the structure of the reacting molecule.
Question:Suppose you have to burn a piece of charcoal.
During combustion of the charcoal heat energy is released, so it is exothermic reaction, but heat is required to start the whole burning process! When we ignite the fuel we need to light a march first, which first gives some heat energy to the charcoal before the charcoal starts reacting with oxygen in the air. But on thw whole, the heat energy released during burning is much more than that required to start the reaction, so it is exothermic?
So at the beginning the burning of charcoal is an endothermic reaction, and after that it becomes exothermic? Can we separate combustion into 2 stages? Thanks!
Answers:This is a nice question.
The overall reaction is exothermic, but as you point out the beginning part is endothermic. It turns out that the beginning part is vaporizing the coal into a gas so that it can burn. That process continues throughout time the coal is burning. Once there is enough vapor to ignite, the fire then supplies enough energy to vaporize more coal, as well as even more heat to do useful work.
There is also something called activation energy. This is the energy required for a reaction to start. For example, in order to start the fire, there must be some spark to trigger it to burn, otherwise you would just have warm coal gas.
Question:I need examples of longitiudinal, transverse and surface waves in everyday life (i.e you do this task that encounters or uses that type of wave).
thank you! I need about 3 for each type of wave.
light waves are all transverse electromagnetic waves
Sound waves travelling ON the surface of a medium are transverse eg: sound wave travelling along the surface of a table.....
A sound wave that travels IN or along the medium: eg: a wave travelling IN air or In water........
Examples of transverse waves include seismic S (secondary) waves, and the motion of the electric (E) and magnetic (M) fields in an electromagnetic plane wave, which both oscillate perpendicularly to each other as well as to the direction of energy transfer. Therefore an electromagnetic wave consists of two transverse waves, visible light being an example of an electromagnetic wave.
Examples of longitudinal waves are sound, ultrasound, and earthquake
a surface wave is a mechanical wave that propagates along the interface between differing media, usually two fluids with different densities
Examples are the waves at the surface of water and air (ocean surface waves), or ripples in the sand at the interface with water or air. Another example is internal waves, which can be transmitted along the interface of two water masses of different densities.
Question:for example , when we suffer acidity we take milk of magnisia.
i want 9 more examples
Answers:Tums and Rolaids contain NaHCO3, baking soda for relief of acid stomach. There are other products on the market.
Use of baking soda to neutralize an acid spill in industry
Use of baking soda in cooking may be for the leavening effect(release of CO2) but it needs a neutralizing reaction to release the CO2
Old fashioned soda acid fire extinguisher worked by an acid causing the release of the CO2 from the NaHCO3
Many experiments that take place in an acid environment must be neutralized
Your own body does a neutralization as food finishes in the stomach and goes into the small intestine where an alkaline environment is needed for the next enzyme reaction
There aremany industrial reactions that require an acid environment tha need to be neutralized after the reaction.
Chemical and Physical Changes in everyday life :This video shows examples of chemical and physical changes in our everyday lives.