Question | Answer |
Define: Laws of Conservation of Mass | Nothing is ever created or destroyed, only changed. |
Define: Physical Change | (Dictionary.com) A usually reversible change in the physical properties of a substance, as a size or shape. |
Define: Chemical Change | (Dictionary.com) A usually irreversible chemical reaction involving the rearrangement of the atoms or one or more substances and a change in their chemical properties and composition resulting in the formation of at least one new substance. |
Define: Element | Substance that cannot be broken down into simpler substances. |
Define: Chemical Formula | (Dictionary.com) A representation of a substance using symbols for its constituent elements. |
Define: Element Molecule
(Diatomic) | Molecule of only one type of atom. |
Define: Chemical Equation | Shorthand form for writing what reactions are used and what products are formed in a chemical reaction. Sometimes shows whether energy in produced or absorbed. |
Define: Reactant
(In a chemical equation) | Substances that go through a chemical change or a substance that exist before a chemical reaction begins. |
Define: Products
(In a chemical equation) | Substances that result from a chemical reaction. |
Define: Coefficient
(In a chemical equation) | (www.visionlearning.com) The coefficient is the number in front of a molecule symbol. |
Define: Subscript
(In a chemical equation) | (www.ndt-ed.org) If more than one atom of a specific element is in a molecule, it is followed by a number to indicate the number of atoms of the element. |
Define: Compound Molecule | Compound made up out of more than one type of atom. |
Define: Chemical Reaction | Process that produces chemical change resulting in new substances that have properties different from those of the original substance. |