- In Science students will review the differences between elements and compounds and learn that elements are pure substances represented by chemical symbols.
- Key Concepts
- Matter has mass and takes up space. Mass measures how much matter is present and volume measures how much space the matter occupies. Matter occurs as elements, compounds or mixtures.
- An element is a pure substance that cannot be broken down into simpler different substances. A sample of an element may contain many atoms but they are all the same; an atom is the smallest particle of a substance that maintains consistent properties used to identify an element.
- Matter is considered a pure substance when it is uniform throughout and has consistant properties. Elements, made of a single kind of atom, are pure substances. Compounds, made of two or more kinds of atoms bound together, are pure substances. Mixtures, made of a blend of elements and compounds, are not pure substances because they do not have consistent properties.Elements are represented on the Periodic Table of Elements with one or two letter chemical symbols, such as O for oxygen or Si for silicon.
- Compounds consists of atoms of different kinds of elements that are bound together. Compounds can be broken down into simpler substances, their component atoms.
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April 2015
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