Skill 12.1c-Differentiate between atoms, molecules, elements, and compounds

Skill 12.1c-Differentiate between atoms, molecules, elements, and compounds 

A pure substance may be an element (such as carbon in diamond) or a compound (such as carbon dioxide, CO2). Compounds may be decomposed into two or more different elements. Elements cannot be decomposed into simpler substances. 

Atoms are the smallest possible unit of an element (see Competency 1.2). Carbon atoms may arrange themselves into different pure substances such as graphite and diamond (See Skill 5.1a). Molecules are combinations of tightly bound atoms. For 

In the kinetic molecular theory of gases (Competency 3.1), the distinction between atoms and molecules is not very important. Atoms of argon gas obey the ideal gas law in much the same was as molecules of N2, so the word molecule is used less formally in this subfield to include atomic gases. 

Skill 12. Id-Corn pare and contrast states of matter and describe the role energy plays in the conversion from one state to another 

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