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The electrons that are in the highest energy level of an atom and that are involved in chemical bonding
Valenece electron
A change in which one or more substances combine or break apart. to form new substances
Chemical Change
A chemical reaction in which two or more simple substances combine to form an new more complex substance
synthesis
A substance that enters a chemical reaction
reactant
A chemical bond formed when two atoms share electrons
A representation of the valence electrons in an atom using dots
Electron dot diagram
A compound that. consists of positive and negative ions
Ionic Compound
A neutral group of two or more atoms held together by covalent bonds
molecule
Symbols that show the elements in a compound and the ratio of the atoms
Chemical Formula
A solid that forms from a solution during a chemical reaction
Precipitate
The force of attraction that holds two atoms together
Chemical Bond
Ionic Bond
An atom or group of atoms that has become electrically charged
ION
a reaction that absorbs energy
endothermic reaction
double bond
a chemical bond formed when atoms share 2 pairs of electrons
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
Coefficient
A substance formed as a result of a chemical reaction
Product
A change that alters the form or appearance of a material but does not make the material into another substance
Physical Change
A solid in which the atoms are arranged in a pattern that repeats again and again
Crystal
a covalent bond in which electrons are shared equally
non polar bond
A chemical bond formed when atoms share three pairs of electrons
Triple Bond
A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound
Subscript
A covalent bond in which atoms are shared unequally
Polar bond
The principal that the total amount of matter is neither created nor destroyed during any chemical or physical change
Law of conservation of mass
A reaction that releases energy usually in the form of heat
exothermic reaction