Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. },{ googletag.pubads().collapseEmptyDivs(false); googletag.pubads().disableInitialLoad(); dfpSlots['leftslot'] = googletag.defineSlot('/2863368/leftslot', [[120, 600], [160, 600]], 'ad_leftslot').defineSizeMapping(mapping_leftslot).setTargeting('sri', '0').setTargeting('vp', 'top').setTargeting('hp', 'left').setTargeting('ad_group', Adomik.randomAdGroup()).addService(googletag.pubads()); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, In general, endo is the major product because it is formed when the electron-withdrawing groups of the dienophile are pointing towards the π electrons of the diene. addPrebidAdUnits(pbAdUnits); ga('send', 'pageview'); Add endothermic reaction to one of your lists below, or create a new one. Endo Explained: It is found in organic compounds, know as Endo-Exo isomerism, has substituents on a ring { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, endo–exo isomerism is a special type of stereoisomerism found in organic compounds with a substituent on a bridged ring system. { bidder: 'ix', params: { siteId: '555365', size: [120, 600] }}, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, { bidder: 'appnexus', params: { placementId: '11653860' }}, }; { bidder: 'ix', params: { siteId: '555365', size: [300, 250] }}, Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. googletag.pubads().addEventListener('slotRenderEnded', function(event) { if (!event.isEmpty && event.slot.renderCallback) { event.slot.renderCallback(event); } }); name: "_pubcid", googletag.pubads().setTargeting("cdo_ptl", "entry-lcp"); { bidder: 'openx', params: { unit: '539971079', delDomain: 'idm-d.openx.net' }}, googletag.pubads().setTargeting("cdo_t", "science"); Endo Definition: In Diels-Alder reactions that produce bicyclic structures, the positions that are syn to the larger bridge. The isomer with the longest bridge has endo before it’s initial identity as a prefix. { bidder: 'sovrn', params: { tagid: '446382' }}, Learn about Endothermic Reactions with Examples. The prefix endo is reserved for the isomer with the substituent located closest, or " syn ", to the longest bridge. } { bidder: 'ix', params: { siteId: '555365', size: [160, 600] }}, var mapping_houseslot_b = googletag.sizeMapping().addSize([963, 0], []).addSize([0, 0], [300, 250]).build(); googletag.pubads().set("page_url", "https://dictionary.cambridge.org/dictionary/english/endothermic-reaction"); By looking at the HOMO and LUMO (frontier orbitals) of the reacting components we can see why. pbjsCfg = { A hallmark of this type of reaction is that it feels cold. 'min': 3.05, {code: 'ad_btmslot_a', pubstack: { adUnitName: 'cdo_btmslot', adUnitPath: '/2863368/btmslot' }, mediaTypes: { banner: { sizes: [[300, 250], [320, 50], [300, 50]] } }, var mapping_btmslot_a = googletag.sizeMapping().addSize([746, 0], [[300, 250], 'fluid']).addSize([0, 0], [[300, 250], [320, 50], [300, 50], 'fluid']).build(); { bidder: 'sovrn', params: { tagid: '346698' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_rightslot2' }}]}]; { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, An endothermic reaction is any chemical reaction that absorbs heat from its environment. The law of conservation of energy states that in any physical or chemical process, energy is neither created nor destroyed. {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, { bidder: 'sovrn', params: { tagid: '346688' }}, params: { if(pl_p) A good example of an endothermic reaction includes dissolving a salt. These reactions lower the temperature of their surrounding area, thereby creating a cooling effect. { bidder: 'openx', params: { unit: '539971081', delDomain: 'idm-d.openx.net' }}, },{ iasLog("criterion : cdo_pc = dictionary"); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, The isomer with the longest bridge has endo before it’s … } {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, expires: 60 }; chemical reaction, reaction - (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water" { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_SR' }}, { bidder: 'appnexus', params: { placementId: '19042093' }}, { bidder: 'ix', params: { siteId: '195466', size: [728, 90] }}, bids: [{ bidder: 'rubicon', params: { accountId: '17282', siteId: '162036', zoneId: '776160', position: 'atf' }}, { bidder: 'criteo', params: { networkId: 7100, publisherSubId: 'cdo_topslot' }}, var mapping_houseslot_a = googletag.sizeMapping().addSize([963, 0], [300, 250]).addSize([0, 0], []).build(); { bidder: 'appnexus', params: { placementId: '19042093' }}, endothermic reaction definition: 1. a chemical reaction in which heat is absorbed 2. a chemical reaction in which heat is absorbed…. ga('require', 'displayfeatures'); { bidder: 'triplelift', params: { inventoryCode: 'Cambridge_MidArticle' }}, "login": { iasLog("criterion : cdo_dc = english"); googletag.pubads().setTargeting("cdo_c", ["science_geographic_locales"]); {code: 'ad_rightslot', pubstack: { adUnitName: 'cdo_rightslot', adUnitPath: '/2863368/rightslot' }, mediaTypes: { banner: { sizes: [[300, 250]] } }, { bidder: 'openx', params: { unit: '541042770', delDomain: 'idm-d.openx.net' }}, iasLog("setting page_url: - https://dictionary.cambridge.org/dictionary/english/endothermic-reaction"); This can be used to classify reactions as exothermic or endothermic. { bidder: 'ix', params: { siteId: '195464', size: [120, 600] }}, { bidder: 'sovrn', params: { tagid: '346693' }}, { bidder: 'pubmatic', params: { publisherId: '158679', adSlot: 'cdo_topslot' }}]}, }); {code: 'ad_topslot_b', pubstack: { adUnitName: 'cdo_topslot', adUnitPath: '/2863368/topslot' }, mediaTypes: { banner: { sizes: [[728, 90]] } }, Where to Buy Saltpeter or Potassium Nitrate, 10 Fun Chemistry Demonstrations and Experiments, Glow Stick Experiment - Rate of Chemical Reaction, Calculate the Change in Entropy From Heat of Reaction, How to Make a Storm Glass to Predict the Weather, Ph.D., Biomedical Sciences, University of Tennessee at Knoxville, B.A., Physics and Mathematics, Hastings College, The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride, Reacting ethanoic acid with sodium carbonate.