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8 Science Vocab 1

8th grade 1st 6 weeks. Element, molecule, equation

Law of Conservation Method a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system
Physical Change a change from one state to another without a change in chemical composition; usually reversible
Chemical Change the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance; usually irreversible
Element simplest form of matter; can't be broken down
Chemical Formula a representation of a substance using symbols for its constituent elements
Element (Diatomic) Molecule elements that exist in pairs in nature; molecules composed only of two atoms, of either the same or different chemical elements
Compound Molecule a compound regarded as a union of molecules retaining their identities
Chemical Equation a representation of a chemical reaction using symbols of the elements to indicate the amount of substance, usually in moles, of each reactant and product
Chemical Reaction a process in which one or more substances are changed into others
Reactants (in a chemical equation) any substance that undergoes a chemical change in a given reaction, esp. a substance that is present at the start of the reaction
Products (in a chemical reaction) a substance obtained from another substance through chemical change
Coefficient ( in a chemical reaction) a number placed in front of a term in a chemical equation to indicate how many molecules (or atoms) take part in the reaction
Subscript (in a chemical reaction) Gives information as to the number of atoms of that kind there are in one molecule. Refers to the position and size of a text
Ionic Compound a compound held together by Ionic bonds;A chemical bond formed between two ions with opposite charges. Ionic bonds form when one atom gives up one or more electrons to another atom. These bonds can form between a pair of atoms or between molecules
Metallic Compound A metallic compound is a compound that contains one or more metal elements
Synthesis Formation of a compound from simpler compounds or elements
Decomposition separation into constituents by chemical reaction
Single Replacement A chemical reaction in which an element replaces one element in a compound.
Double Replacement a chemical reaction where two elements in different compounds trade places
Created by: w0306477



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