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Chemical symbol
a letter or group of letters representing an element in a chemical formula.
Compound ion
an ion made up of several different atoms covalently bonded together and with an overall charge
Molecular formula
a formula that shows the actual number of atoms of each element present in a molecule of the compound.
Empirical formula
a formula for a compound that shows the simplest ratio of atoms present.
Word equation
a summary of a chemical reaction using the chemical names of the reactants and products.
Reactants
the chemical substances that react together in a chemical reaction.
Products
the substance(s) produced by a chemical reaction.
Balanced chemical equation
the total number of any of the atoms involved is the same on both the reactant and product sides of the equation.
State symbols
symbols used to show the physical state of the reactants and products in a chemical reaction.
Ionic equation
the simplified equation for a reaction involving ionic substances by removing the ions that don’t take part in the reaction.
Formula unit
the unit of an element or compound is the molecule or group of ions defined by the chemical formula of the substance.
Relative molecular mass
the sum of all the relative atomic masses of the atoms present in a molecule.
Relative formula mass
the sum of the all the relative atomic masses of the atoms present in a ‘formula unit’ of a substance.
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