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Endothermic reaction: very, VERY cool.
Endothermic reaction: very, VERY cool.
Published: 2012/01/26
Channel: MrBellScience
Phase Changes: Exothermic or Endothermic?
Phase Changes: Exothermic or Endothermic?
Published: 2012/04/11
Channel: Tyler DeWitt
What are endothermic and exothermic reactions | Chemistry for All | FuseSchool
What are endothermic and exothermic reactions | Chemistry for All | FuseSchool
Published: 2016/11/08
Channel: FuseSchool - Global Education
SchoolFreeware Science Video 13 - Cool Drinks Fast With Endothermic Reactions
SchoolFreeware Science Video 13 - Cool Drinks Fast With Endothermic Reactions
Published: 2013/12/15
Channel: SchoolFreeware
Endothermic Reaction
Endothermic Reaction
Published: 2007/01/29
Channel: Bob Burk
An endothermic reaction
An endothermic reaction
Published: 2011/01/30
Channel: Augustus
exothermic and endothermic reaction demonstrations
exothermic and endothermic reaction demonstrations
Published: 2014/12/08
Channel: Mr. Kish's Science Channel
Endothermic and Exothermic Reactions
Endothermic and Exothermic Reactions
Published: 2013/09/25
Channel: Bozeman Science
10 Examples of Endothermic Reactions in Everyday Life : Physics Concepts
10 Examples of Endothermic Reactions in Everyday Life : Physics Concepts
Published: 2014/02/19
Channel: eHowEducation
Energy & Chemistry: Crash Course Chemistry #17
Energy & Chemistry: Crash Course Chemistry #17
Published: 2013/06/11
Channel: CrashCourse
Exothermic and Endothermic Reactions - Video for kids
Exothermic and Endothermic Reactions - Video for kids
Published: 2013/05/20
Channel: makemegenius
Dissolving Ammonium Nitrate An Endothermic Process
Dissolving Ammonium Nitrate An Endothermic Process
Published: 2009/08/09
Channel: mreisley
Endothermic vs Exothermic Processes - Explained
Endothermic vs Exothermic Processes - Explained
Published: 2016/02/04
Channel: Chem Academy
Endothermic and Exothermic Reactions Explained - Examples & Graphs
Endothermic and Exothermic Reactions Explained - Examples & Graphs
Published: 2016/07/18
Channel: The Organic Chemistry Tutor
simple endothermic reaction
simple endothermic reaction
Published: 2015/11/19
Channel: Mr. Kish's Science Channel
Endothermic - Chem Definition
Endothermic - Chem Definition
Published: 2011/02/23
Channel: Periodic Videos
Endothermic Reaction in Plug Flow Reactor
Endothermic Reaction in Plug Flow Reactor
Published: 2013/08/28
Channel: LearnChemE
The Sci Guys: Science at Home - SE1 - EP7: Hot Ice - Exothermic Reactions and Supercooled solutions
The Sci Guys: Science at Home - SE1 - EP7: Hot Ice - Exothermic Reactions and Supercooled solutions
Published: 2013/04/04
Channel: The Sci Guys
Chilling Endothermic Reaction
Chilling Endothermic Reaction
Published: 2016/12/19
Channel: mopatin
Endergonic, exergonic, exothermic, and endothermic reactions | Khan Academy
Endergonic, exergonic, exothermic, and endothermic reactions | Khan Academy
Published: 2015/08/13
Channel: Khan Academy
GCSE Chemistry (9-1) Exothermic and Endothermic reactions
GCSE Chemistry (9-1) Exothermic and Endothermic reactions
Published: 2017/03/07
Channel: Freesciencelessons
Endothermic Reaction - two solids
Endothermic Reaction - two solids
Published: 2012/05/19
Channel: chemed
How to create an exothermic reaction? - Live Experiments (Ep 40) - Head Squeeze
How to create an exothermic reaction? - Live Experiments (Ep 40) - Head Squeeze
Published: 2013/06/29
Channel: BBC Earth Lab
Exothermic vs. Endothermic Reactions
Exothermic vs. Endothermic Reactions
Published: 2013/01/08
Channel: Step-by-Step Science
Exothermic and endothermic reactions (The Science Kids Chemistry #4)
Exothermic and endothermic reactions (The Science Kids Chemistry #4)
Published: 2015/12/01
Channel: The Science Kids
08 Endothermic reactions.mpg
08 Endothermic reactions.mpg
Published: 2010/10/24
Channel: sciencedemo
Christmas Science | It’s feeling cold | The endothermic reaction
Christmas Science | It’s feeling cold | The endothermic reaction
Published: 2015/11/16
Channel: STEM Learning
Endothermic and Exothermic Reactions | Hindi
Endothermic and Exothermic Reactions | Hindi
Published: 2017/09/20
Channel: Learn India Learn
Thermochemical Equations Practice Problems
Thermochemical Equations Practice Problems
Published: 2012/04/15
Channel: Tyler DeWitt
CHEMISTRY LAB EXPERIMENT  - EXOTHERMIC & ENDOTHERMIC REACTIONS
CHEMISTRY LAB EXPERIMENT - EXOTHERMIC & ENDOTHERMIC REACTIONS
Published: 2015/12/12
Channel: NCERT OFFICIAL
Dissolving of NH4Cl: An Endothermic Process
Dissolving of NH4Cl: An Endothermic Process
Published: 2011/12/08
Channel: NCSSMDistanceEd
Some Examples of Endothermic and Exothermic Reactions in Urdu   Sabaq Foundation 183
Some Examples of Endothermic and Exothermic Reactions in Urdu Sabaq Foundation 183
Published: 2016/09/03
Channel: Learning Paradise
Baking soda & Citric Acid Endothermic Reaction
Baking soda & Citric Acid Endothermic Reaction
Published: 2016/02/08
Channel: J&L Co.
Tricky Question: Exothermic or Endothermic?
Tricky Question: Exothermic or Endothermic?
Published: 2012/04/13
Channel: Tyler DeWitt
Exothermic and endothermic reaction
Exothermic and endothermic reaction
Published: 2011/05/31
Channel: smartschoolonline
Endothermic Vs. Exothermic Reaction Graphs
Endothermic Vs. Exothermic Reaction Graphs
Published: 2015/10/13
Channel: mrscolosia
Chilling effects – a spontaneous endothermic demonstration
Chilling effects – a spontaneous endothermic demonstration
Published: 2016/10/13
Channel: Royal Society of Chemistry
Endothermic Reaction.
Endothermic Reaction.
Published: 2015/03/30
Channel: Science and Maths by Primrose Kitten
What does one mean by exothermic and endothermic reactions Give examples
What does one mean by exothermic and endothermic reactions Give examples
Published: 2015/05/14
Channel: Ncert Solutions CBSE ncerthelp.com
Spontaneous endothermic reaction
Spontaneous endothermic reaction
Published: 2015/06/03
Channel: Random Experiments International
Endothermic Reaction
Endothermic Reaction
Published: 2014/11/06
Channel: Azat Ovezov
Chem Demo - Endothermic Reaction
Chem Demo - Endothermic Reaction
Published: 2014/04/29
Channel: DeadlyLaugh
Chemical Ice Pack/ Endothermic Quick Freeze
Chemical Ice Pack/ Endothermic Quick Freeze
Published: 2008/12/04
Channel: Sully Science
Endothermic Reaction - Citric Acid and Sodium Bicarbonate
Endothermic Reaction - Citric Acid and Sodium Bicarbonate
Published: 2012/05/25
Channel: DrDougYoung
Potential Energy Diagrams - Chemistry - Catalyst, Endothermic & Exothermic Reactions
Potential Energy Diagrams - Chemistry - Catalyst, Endothermic & Exothermic Reactions
Published: 2016/07/14
Channel: The Organic Chemistry Tutor
Exothermic and endothermic dissolution | Solubility | Chemistry
Exothermic and endothermic dissolution | Solubility | Chemistry
Published: 2015/07/01
Channel: KClassScienceChannel
Endothermic and Exothermic Process/ Reaction
Endothermic and Exothermic Process/ Reaction
Published: 2017/09/10
Channel: ZEREG Tv
Endothermic Reaction - Baking Soda and Vinegar
Endothermic Reaction - Baking Soda and Vinegar
Published: 2014/03/04
Channel: Karoly Tippets-Russell
GCSE BBC Bitesize Higher Science - Exothermic and Endothermic Chemical reactions
GCSE BBC Bitesize Higher Science - Exothermic and Endothermic Chemical reactions
Published: 2012/04/12
Channel: JamJarMMX
Endothermic Reactions in Urdu   Sabaq Foundation 182
Endothermic Reactions in Urdu Sabaq Foundation 182
Published: 2016/09/03
Channel: Learning Paradise
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WIKIPEDIA ARTICLE

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The term endothermic process describes a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat. The term was coined by Marcellin Berthelot from the Greek roots endo-, derived from the word "endon" (ἔνδον) meaning "within" and the root "therm" (θερμ-) meaning "hot." The intended sense is that of a reaction that depends on absorbing heat if it is to proceed. The opposite of an endothermic process is an exothermic process, one that releases, "gives out" energy in the form of heat. Thus in each term (endothermic & exothermic) the prefix refers to where heat goes as the reaction occurs, though in reality it only refers to where the energy goes, without necessarily being in the form of heat. All chemical reactions involve both the breaking of existing and the making of new chemical bonds. A reaction to break a bond always requires the input of energy and so such a process is always endothermic. When atoms come together to form new chemical bonds, the electrostatic forces bringing them together leave the bond with a large excess of energy (usually in the form of vibrations and rotations). If that energy is not dissipated, the new bond would quickly break apart again. Instead, the new bond can shed its excess energy - by radiation, by transfer to other motions in the molecule, or to other molecules through collisions - and then become a stable new bond. Shedding this excess energy is the exothermicity that leaves the molecular system. Whether a given overall reaction is exothermic or endothermic is determined by the relative contribution of these bond breaking endothermic steps and new bond stabilizing exothermic steps.

The concept is frequently applied in physical sciences to, for example, chemical reactions, where thermal energy (heat) is converted to chemical bond energy.

Endothermic (and exothermic) analysis only accounts for the enthalpy change (∆H) of a reaction. The full energy analysis of a reaction is the Gibbs free energy (∆G), which includes an entropy (∆S) and temperature term in addition to the enthalpy. A reaction will be a spontaneous process at a certain temperature if the products have a lower Gibbs free energy (an exergonic reaction) even if the enthalpy of the products is higher. Entropy and enthalpy are different terms, so the change in entropic energy can overcome an opposite change in enthalpic energy and make an endothermic reaction favorable.

Examples[edit]

References[edit]

  1. ^ Austin, Patrick (January 1996). "Tritium: The environmental, health, budgetary, and strategic effects of the Department of Energy's decision to produce tritium". Institute for Energy and Environmental Research. Retrieved 2010-09-15. 
  2. ^ Qian, Y.-Z.; Vogel, P.; Wasserburg, G. J. (1998). "Diverse Supernova Sources for the r-Process". Astrophysical Journal 494 (1): 285–296. arXiv:astro-ph/9706120. Bibcode1998ApJ...494..285Q. doi:10.1086/305198.

External links[edit]

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