Chemistry: Chemical Reactions

• Reactants

  elements or compounds that enter into a chemical reaction
• Products

  The elements or compounds produced by a chemical reaction.
• Reversible reaction


  a chemical reaction in which the products re-form the original reactants
• Law of Conservation of Mass

  the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes
• balanced equation

  a chemical equation in which mass is conserved; each side of the equation has the same number of atoms of each element
• Endothermic reaction


  A reaction in which energy/heat is absorbed
• Exothermic reaction

  A reaction that releases energy in the form of heat
• Synthesis reaction

  a reaction in which two or more substances combine to form a new compound
• Decomposition reaction


  a reaction in which a single compound breaks down to form two or more simpler substances
• Combustion reaction

  a chemical reaction that occurs when a substance reacts with oxygen, releasing energy in the form of heat and light
• Corrosion


  the deterioration of a metal due to a chemical reaction in the environment
• Precipitate


  A solid that forms from a solution during a chemical reaction.
• Solubility

  A measure of how much solute can dissolve in a given solvent at a given temperature.
• Solubility Rules


  a set of rules used to predict whether an ionic compound will be soluble or insoluble in water

  
• Photosynthesis

  Plants use the sun's energy to convert water and carbon dioxide into sugars
• Respiration


  The process by which cells break down simple food molecules to release the energy they contain.
• Acids


  compounds that release hydrogen ions when dissolved in water
• Bases

  Compounds that reduce the concentration of hydrogen ions in a solution.
• pH

  hydrogen ion concentration
• Neutralisation reaction

  acid + base -> salt + water