Question | Answer |
Law of conservation of mass | the mass of an isolated system (closed to all matter and energy) will remain constant over time. |
physical change | Physical changes are concerned with energy and states of matter |
chemical change | A chemical change produces a new substance. |
element | a representation of a substance using symbols for its constituent elements. |
element(diatomic) molecule | Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements. |
Compound molecule | two different molecules formed when two or more atoms of an element chemically join together. |
chemical equation | A chemical equation is symbolic representation of a chemical reaction |
chemical reaction | A process that involves rearrangement of the molecular or ionic structure of a substance |
reactants(in a chemical equations) | Chemical equations show the reactants and products |
products(in a chemical equation) | other substances (compounds and/or elements) called products |
Coefficient (in a chemical equation | The coefficients next to the symbols and formulae of entities are the absolute values of the stoichiometric numbers |
subscript (in a chemical equation) | The subscripts tell you how many atoms of each element are in the equation |
Chemical formula | A chemical formula or molecular formula is a way of expressing information about the atoms |