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science vocab
Question | Answer |
---|---|
Law of Conservation of Mass | it states that matter cant be created or disappear. |
Physical Change | a change is a substance that only affects the physical state. |
Chemical Change | a change that changes the substance and can not be reversed. the whole substance has changed. |
Element | a pure substance consisting of one type of atom |
Chemical Formula | a way of expressing information about the atoms that constitute a particular chemical compound |
Element (Diatomic) Molecule | molecules composed only of two atoms, of either the same or different chemical elements. |
Compound Molecule | an electrically neutral group of two or more atoms held together by covalent chemical bonds. |
Chemical Equation | 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 (in a chemical equation) | the equation the reactants (starting materials) and products (resulting substance), the formulas of the participants, |
Products (in a chemical equation) | The equation identifies the reactants (starting materials) and products |
Coefficient (in a chemical equation) | The number of molecules of reactants or products. For instance: |
Subscript (in a chemical equation) | The subscripts tell you how many atoms of each element are in the equation |
Diatomic |