element
A pure substance containing only one type of matter which cannot be broken down by chemical methods.
Substance
compound made of several atoms or ions
Avogadro's number
The number of items in a mole, equal to 6.022x10^23
Mole
A group of atoms, molecules, or formula units that contain 6.022x10^23 of these items
Molar Mass
the mass in grams of 1 mol of an element is equal numerically to its atomic mass. The molar mass of a compound is equal to the sum of the masses of the elements in the formula.
Chemical Formula
the symbols and subscripts that represent the lowest whole-number ratio of atoms or ions in a compound
Atom
The smallest particle of an element that retains the characteristics of the elements
Molecular compound
A combination of atoms in which noble gas configurations are attained by electron sharing
ionic compound
A compound of positive and negative ions held together by ionic bonds
molecules
The smallest unit of two or more atoms held together by covalent bonds
formula units
the group of ions represented by the formula of an ionic compound
empirical formula
The simplist or smallest whole-number ratio of the atoms in a formula
molecular formula
the actual formula that gives the number of atoms of each type of elements in the compound
mass percent
The percent by mass if the elements in a formula
chemical reaction
a process that involves rearrangement of the molecular or ionic structure, as opposed to a change in physical form or a nuclear reaction.
chemical equation
a symbolic representation of a chemical reaction in the
balanced chemical equation
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coefficient
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combination reaction
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