Terms and Definitions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Law of Conservation of Mass | States that in a chemical reaction, the mass of the products equals the mass of the reactants.
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| Physical Change | Changes in a substance that affect only physical properties.
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| Chemical Change | Chemical changes produce new substances that have properties different from those of the original substances.
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| Element | Substance that cannot be broken down into simpler substances.
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| Chemical Formula | An expression which states the number and type of atoms present in a molecule of a substance.
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| Element Molecule | Molecules of only one atom.
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| Compound Molecule | Molecules of more than one type of atom.
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| Chemical Equation | Shorthand form for writing what reactants are used and what products are formed in a chemical reaction.
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| Chemical Reaction | Process that produces chemical change, resulting in new substances that have properties different from those of the original substances.
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| Reactants (in a chemical equation) | Substance that exists before a chemical reaction begins.
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| Products (in a chemical equation) | Substance that forms as a result of a chemical reaction.
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| Coefficient | The coefficient tells the number of molecules.
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| Subscript | The subscripts tells the number of a certain type of atom in one molecule.
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| Diatomic Molecule | Diatomic molecules are molecules composed only of two atoms, of either the same or different chemical elements.
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