KentChemistry HOME

 
 

 
Custom Search

Matter Terminology    Classifying Matter  Phases of Matter  Physical and Chemical Changes  Separation Techniques  Vapor Pressure   Phase Changes  Heating Curve  Phase Diagrams

 

Endothermic and Exothermic Processes

 

 

Exothermic- the word describes a process that releases energy in the form of heat.

Forming a chemical bond  releases energy and therefore is an exothermic process.

Exothermic reactions usually feel hot because it is giving heat to you.

Endothermic - a process or reaction that absorbs energy in the form of heat.

Breaking a chemical bond requires energy and therefore is Endothermic.

Endothermic reactions usually feel cold because it is taking heat away from you.

 

Exothermic Processes Endothermic Processes
  • freezing water

  • solidifying solid salts

  • condensing water vapor

  • making a hydrate from an anhydrous salt

  • forming an anion from an atom in the gas phase

  • Annihilation of matter E=mc2

  • splitting of an atom

 

  • melting ice cubes

  • melting solid salts

  • evaporating liquid water

  • making an anhydrous salt from a hydrate

  • forming a cation from an atom in the gas phase

  • splitting a gas molecule

  • separating ion pairs

  • cooking an egg

  • baking bread

Exothermic Reactions Endothermic Reactions
  • Combustion of hydrogen

  • dissolving lithium chloride in water

  • Burning of propane

  • dehydration of sugar with sulfuring acid

  • thermite

  • decomposition of hydrogen peroxide

  • decomposition od ammonium dichromate

  • halogenation of acetylene

 

  • Reaction of barium hydroxide octahydrate crystals with dry ammonium chloride

  • dissolving ammonium chloride in water

  • reaction of thionyl chloride (SOCl2) with cobalt(II) sulfate heptahydrate

  • mixing water and ammonium nitrate

  • mixing water with potassium chloride

  • reacting ethanoic acid with sodium carbonate

  • photosynthesis (chlorophyll is used to react carbon dioxide plus water plus energy to make glucose and oxygen)

 

An Endothermic Reaction- The reaction of barium hydroxide octahydrate crystals with dry ammonium chloride.

An Exothermic reaction- The combustion of Acetone peroxide.

Matter Terminology    Classifying Matter  Phases of Matter  Physical and Chemical Changes  Separation Techniques  Vapor Pressure   Phase Changes  Heating Curve  Phase Diagrams

Chemical Demonstration Videos