Recall that Matter can be categorized as a single or variable composition.
• Matter is considered a pure substance if it is composed of a single entity. Pure substances can be further categorized into two:
▪ Element → cannot be separated into simpler substances or composed of only 1 type of atom (eg. O3, Cl2)
▪ Compound/Molecule → can be separated into simpler substances
• Matter is considered a mixture if they have variable composition. Mixtures are not chemically combined. Mixtures can be further categorized into two:
A(n) _ refers to two or more atoms held together by covalent bonds
A. community
B. isotope
C. molecule
D. ion
E. shell
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