Word list

• Acidity


  The extent to which a substance displays characteristics common to acids
• Activation Energy


  The minimum energy required by reactants for a reaction to occur.
• Alkalinity


  The extent to which a substance displays characteristics common to bases
• Aqueous


  Dissolved in water
• Avagadro's Consant


  The number of particles in one mole NA = 6.022 x 1023 mol-1
• Catalyst


  A substance which lowers the activation energy and therefore speeds up a chemical reaction. It is neither a reactant nor a product and is not used up by the reaction.
• Chemical Change


  A change that results in at least one new substance by a rearrangement of atoms
• collision theory


  A theoretical model that accounts for the rates of chemical reactions in terms of collisions occurring during a chemical reaction.
• Covalent Bond


  The force of attraction formed when one or more pairs of electrons are shared between two nuclei
• Decomposition


  A reaction type where a compound is broken down into simpler compounds or its elements
• Endothermic


  Absorbs heat energy.
• enthalpy


  The total energy possessed by a chemical substance at constant pressure
• Exothermic


  Releases heat energy
• Insoluble


  Unable to dissolve in a named solvent
• Ion


  An atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
• Ionic Bond


  A type of chemical bonding that involves the electrostatic attraction between oppositely charged ions.
• Mole


  The amount of substance that contains the number of particles equal Avogadro’s constant (NA = 6.022 x 1023 mol-1)
• Molar Mass


  The mass of one mole of an element or compound
• pH


  A measure of the acidity or alkalinity of a substance
• Physical Change


  A change of phase (solid, liquid, gas, aqueous)
• Polyatomic Ion


  An ion that is made up of more than one element, for example the carbonate ion (CO₃²⁻)
• Product


  A substance made by a chemical reaction
• Reactant


  A starting material for a chemical reaction
• Reaction Rate


  The speed with which reactants are converted to products in a chemical reaction
• Salt


  An ionic compound
• Stoichiometry


  The whole number molar ratios of a balanced chemical equation and the resultant calculations of relative amounts of reactants and products.