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Science Vocabulary

Elements, Molecules and Chemical Equations

Law of Conservation of Mass the principle that matter cannot be created or destroyed.
Physical Change a usually reversible change in the physical properties of a substance, as size or shape
Chemical Change a usually irreversible chemical reaction involving 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
Element one of a class of substances that cannot be separated into simpler substances by chemical means
Chemical Formula a representation of a substance using symbols for its constituent elements
Element (Diatomic) Molecule having two of the same atoms in the molecule
Compound Molecule a pure substance composed of two or more elements whose composition is constant
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 rearrangement of the atoms or molecules of two or more substances that come into contact with each other, resulting in the formation of one or more new substances.
Reactants any substance that undergoes a chemical change in a given reaction
Products a substance obtained from another substance through chemical change
Coefficient States the number of molecules of the certain molecule it is in front of
Subscript Number written under the certain atom, states the number of atoms of the element it is underneath
Ionic Compound a chemical compound of cations and anions which are held together by ionic bonds in a lattice structure
Covalent Compound A compound made of molecules- not ions. The atoms in the compound are bound together by shared electrons. Also called a molecular compound.
Metallic Compound Compounds that contain at least one metallic element.
Synthesis the forming or building of a more complex substance or compound from elements or simpler compounds.
Decomposition A reaction in which a compound is broken down into simpler compounds or elements. Compounds sometimes decompose if heated strongly or if subjected to a strong electric current
Single Replacement A reaction of the form A + BC = B + AC. For example, zinc displaces hydrogen from hydrochloric acid in the following reaction: Zn(s) + 2 HCl(aq) = ZnCl2(aq) + H2(g).
Double Replacement A double displacement or metathesis is a reaction in which two reactants trade fragments: AB + CD = AC + BD Most commonly, the fragments are ions, e. g. AgNO3(aq) + NaCl(aq) = AgCl(s) + NaNO3(aq)
Created by: s0607683