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21 terms

Phy Sci 212 Unit 7

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chemical change
A change that occurs when two substances react to produce entirely different substances.
chemical equation (balanced)
An equation with an equal number of atoms in the reactants and products.
chemical formula
A representation of a compound that includes the symbols and numbers of atoms in the compound.
chemical reaction
The breaking of bonds to form new substances.
coefficient
The "6" in 6H2O
covalent bond
A bond between atoms in which electrons are shared.
product
The substance produced in a chemical reaction.
reactant
A substance that enters into and is changed during a chemical reaction.
subscript
The "2" in H2O
ion
An atom that has an electrical charge because it gained or lost an electron.
ionic bond
A bond between atoms in which electrons are lost or gained.
law of conservation of mass
You cannot create or lose mass in a reaction.
octet rule
Most atoms need eight valence electrons to be stable.
oxidation number
A number that indicates how many electrons will be gained or lost during bonding.
physical change
Ice melting is an example of this kind of change.
polyatomic ion
An ion like CO3 or OH
exothermic reaction
A chemical reaction in which energy is released.
endothermic reaction
A chemical reaction in which energy is required.
nuclear reaction
A reaction that involves splitting the nucleus of an atom or fusing 2 nuclei to make a new atom.
fusion
The process of combining the nuclei of atoms to make different atoms.
fission
Breaking up the nucleus of an atom.