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science vocab rachel
science vocab
Question | Answer |
---|---|
law of conservation of mass | a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system |
physical change | usually reversible change in the physical properties of a substance, as size or shape: |
chemical reaction | usually irreversible 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 | representation of a substance using symbols for its constituent elements |
element(diatomic) molecule | molecules composed only of one atom, of either the same or different chemical elements |
compound molecule | molecules composed more than one atom |
chemical equation | 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 process that leads to the transformation of one set of chemical substances to another |
reactants | A substance that takes part in and undergoes change during a reaction. |
products | a substance that forms as a result of a chemical reaction |
coefficient | a number that is constant for a given substance, body, or process under certain specified conditions, serving as a measure of one of its properties |
subscript | Subscript in a chemical formula shows the amount of atoms of that type in each molecule. |