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  1. Basic Chemistry Terms

    • Atoms and Molecules Atoms are the basic building blocks of matter. ...
    • Elements and Compounds Elements are substances that cannot be broken down into simpler substances by chemical means. ...
    • Chemical Reactions Chemical reactions occur when two or more substances interact to form new substances with different chemical and physical properties. ...
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    The scientific discipline that studies chemical substances, compounds, and molecules composed of atoms of various chemical elements, as well as their compositions, structures, properties, behaviors, and the changes they undergo during reactions with other substances.
    Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
    chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
    The substances mentioned above exemplify the two basic types of chemical compounds: molecular ( covalent) and ionic. Methane and water are composed of molecules; that is, they are molecular compounds. Sodium chloride, on the other hand, contains ions; it is an ionic compound.
  3. Glossary of chemistry terms - Wikipedia

  4. Chemistry Glossary - Chemistry - Research Guides at University of ...

  5. Common Definitions and Terms in Organic Chemistry