Exothermic and endothermic reactions GapFill

Energy is always  discoveredconservedcreatedreleased during chemical reactions. There may be a change in the  temperaturemagnetismcolourpolarity of the surroundings due to energy being taken in or given out by the molecules. Reactions in which the surroundings get warmer are called  heatingoxidativeyieldingexothermic, e.g. combustion,  burningneutralisationactivationmining and the reactions of  hand warmerssports injury packsair conditionersmake-up removers, and reactions in which they get colder are called  reductivecoolingendothermicresisting, e.g. thermal  fractionationhydrogenationoxidationdecomposition reactions. Reactions will only occur if particles collide with sufficient  energydirectionstangentsmasses.

One way of representing reactions is using a reaction  gradientsliderprofiletable, which shows the energy of the reactants and products. The height of the curve from the reactants is the  energy peakenergy debtactivation energyinitiation energy, and the difference between the reactants and products is the  energy costactivation energyenergy changeenergy product of the reaction.

When bonds are  twistedbrokenstrengthenedheated in the reactants, energy is taken in. When bonds are  reactedreshapedformedloosened in the products, energy is released. A reaction is exothermic if the energy released is  less thangreater thanin a different form toin the same form as the amount taken in.