Question | Answer |
This principle is equivalent to the conservation of energy, in the sense when energy or mass is enclosed in a system and none is allowed in or out, its quantity cannot otherwise change (hence, its quantity is "conserved"). | law of conervation of mass |
occur when objects or substances undergo a change that does not change their chemical composition | physical changes |
occur when a substance combines with another to form a new substance | chemical change |
one of a class of substances that cannot be separated into simpler substances by chemical means. | element |
molecular formula is a way of expressing information about the atoms that constitute a particular chemical compound. | chemical fomula |
are molecules composed only of two atoms, of either the same or different chemical elements. | element (diatomic) molecule |
a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds. | compound molecule |
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 equation |
a process that leads to the transformation of one set of chemical substances to another. | chemical reaction |
gives the reactants and products | reaction (in a chemical equation) |
Chemical reactions are really the rearrangement of the connectivity between the atoms in the reagenmts to produce products | product ( in a chemical equation) |
the numbers of molecules of reactants or product. | coefficient (in a chemical equation) |
Subscripts are numbers used to tell you how many atoms of an element are present in the equation | subscript (in a chemical) |