Exothermic and endothermic reactions GapFill

Energy is always  discoveredconservedprovidedreleaseddestroyedcreated during chemical reactions. There may be a change in the  humiditymagnetismpolaritycolourtemperaturepressure of the surroundings due to energy being taken in or given out by the molecules. Reactions in which the surroundings get warmer are called  oxidativeyieldingproductiveexothermicgenerativeheating, e.g. combustion,  burningneutralisationprecipitationpolymerisationminingactivation and the reactions of  make-up removerssports injury packshand warmersair conditionersdehumidifiersfood colourings, and reactions in which they get colder are called  coolingsterilisingendothermicreductiveunproductiveresisting, e.g. thermal  distillationchromatographydecompositionhydrogenationfractionationoxidation reactions. Reactions will only occur if particles collide with sufficient  energymassestangentsanglesorientationsdirections.

One way of representing reactions is using a reaction  modelsliderboardgradientprofiletable, which shows the energy of the reactants and products. The height of the curve from the reactants is the  initiation energyactivation energytotal energymaximum reactivityenergy debtenergy peak, and the difference between the reactants and products is the  total energyenergy changeenergy pay-offenergy productactivation energyenergy cost of the reaction.