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Science Vocabulary


Law of Conservation of Mass States that the mass of an isolated system (closed to all matter and energy) will remain constant over time.
Physical Change Any process involving a substance's change from one state (gas, liquid, solid) to another without alteration of the chemical composition.
Chemical Change Occur when a substance combines with another to form a new substance.
Element A pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus.
Chemical Formula A way of expressing information about the atoms that constitute a particular chemical compound.
Element (Diatomic) Molecule Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements.
Compound Molecule A compound molecule is an electrically neutral group of two or more atoms held together by covalent chemical bonds.
Chemical Equation A chemical equation is the symbolic representation of a chemical reaction where the reactant entities are given on the left hand side and the product entities on the right hand side.
Chemical Reaction A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.
Reactants (in a chemical equation) A substance that is consumed in the course of a chemical reaction.
Products (in a chemical equation) Product(s) are formed during chemical reactions as reagents are consumed.
Coefficient (in a chemical equation) The coefficients next to the symbols and formula of entities are the absolute values of the stoichiometric numbers.
Subscript (in a chemical equation) A subscript or superscript is a number, figure, symbol, or indicator that appears smaller than the normal line of type and is set slightly below or above it.
Ionic Compound In chemistry, an ionic compound is a chemical compound in which ions are held together in a lattice structure by ionic bonds.
Covalent Compound A molecule formed by covalent bonds, in which the atoms share one or more pairs of valence electrons
Metallic Compound A metallic compound is a compound that contains one or more metal elements.
Synthesis In general, the noun synthesis refers to a combination of two or more entities that together form something new; alternately, it refers to the creating of something by artificial means.
Decomposition Decomposition is the process by which organic substances are broken down into simpler forms of matter.
Single Replacement A single-displacement reaction, also called single-replacement reaction, is a type of oxidation-reduction chemical reaction when an element or ion moves out of one compound and into another.
Double Replacement A double replacement reaction is a chemical reaction where two reactant ionic compounds exchange ions to form two new product compounds with the same ions.
Created by: n0402637