examples of exothermic reactions in everyday life

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From Wikipedia

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. ...


From Yahoo Answers

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? Thanks.

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.

Answers:Transverse 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..... Longitudinal wave: 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 P-waves. 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.

From Youtube

Chemical and Physical Changes in everyday life :This video shows examples of chemical and physical changes in our everyday lives.