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Science Vocab

Terms and Definitions

QuestionAnswer
Law of Conservation of Mass States that in a chemical reaction, the mass of the products equals the mass of the reactants.
Physical Change Changes in a substance that affect only physical properties.
Chemical Change Chemical changes produce new substances that have properties different from those of the original substances.
Element Substance that cannot be broken down into simpler substances.
Chemical Formula An expression which states the number and type of atoms present in a molecule of a substance.
Element Molecule Molecules of only one atom.
Compound Molecule Molecules of more than one type of atom.
Chemical Equation Shorthand form for writing what reactants are used and what products are formed in a chemical reaction.
Chemical Reaction Process that produces chemical change, resulting in new substances that have properties different from those of the original substances.
Reactants (in a chemical equation) Substance that exists before a chemical reaction begins.
Products (in a chemical equation) Substance that forms as a result of a chemical reaction.
Coefficient The coefficient tells the number of molecules.
Subscript The subscripts tells the number of a certain type of atom in one molecule.
Diatomic Molecule Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements.
Created by: o0308378
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