Chemistry : Chapter 4 - Chemical formulae and equations
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Last updated 7:51 AM on 4/17/23
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13 Terms
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Chemical symbol
a letter or group of letters representing an element in a chemical formula.
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Compound ion
an ion made up of several different atoms covalently bonded together and with an overall charge
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Molecular formula
a formula that shows the actual number of atoms of each element present in a molecule of the compound.
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Empirical formula
a formula for a compound that shows the simplest ratio of atoms present.
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Word equation
a summary of a chemical reaction using the chemical names of the reactants and products.
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Reactants
the chemical substances that react together in a chemical reaction.
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Products
the substance(s) produced by a chemical reaction.
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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.
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State symbols
symbols used to show the physical state of the reactants and products in a chemical reaction.
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Ionic equation
the simplified equation for a reaction involving ionic substances by removing the ions that don’t take part in the reaction.
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Formula unit
the unit of an element or compound is the molecule or group of ions defined by the chemical formula of the substance.
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Relative molecular mass
the sum of all the relative atomic masses of the atoms present in a molecule.
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Relative formula mass
the sum of the all the relative atomic masses of the atoms present in a ‘formula unit’ of a substance.
Note 
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