Can a compound be separated into two or more substances by physical means?
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Elements, Compounds, & Mixtures: Objectives: 1. Explain the difference between an element and a compound. 2. Compare heterogeneous and homogeneous mixtures. 3. Describe several techniques to separate mixtures. Key Terms: element compound pure substance mixture heterogeneous mixture homogeneous mixture Web Resources: Notes: Matter can be better defined by separating it into its simplest parts. Since the atom is the basic unit of matter, we will start there. A group of similar atoms is called an element. Here are some elemental facts. Aggregates (combinations) of elements can form compounds. Its important to know that compounds are pure substances. (A compound of H2O contains nothing but H2O.) Here are some facts regarding compounds. Aggregates of substances (compounds, elements, or mixtures) combine to form mixtures. Mixtures can either appear homogeneous (do not contain visibly different parts - milk) or heterogeneous (visibly different parts - chocolate chip cookie) Here are some facts regarding mixtures.
Elements, Compounds & Mixtures Elements Note that an element:
A molecule consists of two or more atoms of the same element, or different elements, that are chemically bound together. Note that the two nitrogen atoms which comprise a nitrogen molecule move as a unit. Compounds
Note that a compound:
Mixtures
Note that a mixture:
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