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Science Vocab

The Law of Conservation of Mass States that mass is neither created nor destroyed in any ordinary chemical reaction.
Physical change Physical changes are changes affecting the form of a chemical substance, but do not change the chemical composition of that substance.
Chemical changes Chemical changes occur when a substance combines with another to form a new substance, called synthesis or, alternatively, decomposes into two or more different substances.
Element One of a class of substances that cannot be separated into simpler substances by chemical means. See also chart under periodic table.
chemical formula A chemical formula or molecular formula is 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 2 types of molocules put togather to make a compound molecule.
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 H2O(s) ® H2O(l) . . . melting
products Reactants→Products SnO2 + H2 → Sn + 2 H2O
Coefficient The number of molecules of reactants or products. 2 H2 + O2 > 2 H2O
Subscript Subscripts are numbers used to tell you how many atoms of an element are present in the equation. water H20 has 2 atoms of hydrogen and one of oxygen • glucose C6H12O6 has 6 atoms of carbon, 12 of hydrogen, and 6 of oxygen
Created by: b0404058