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chem chap. 1 - • Neutrons—most massive…NUCLEUS •...

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Chapter 1 Chemistry—the study of the composition, structure, and properties of matter and the changes it undergoes Branches of Chemistry • Organic Chemistry—the study of most CARBON containing compounds • Inorganic Chemistry—the study of all substances not classified as organic…NO CARBON • Physical Matter—the study of the properties of matter in relation to their energy • Chemical—any substance with a definite composition Important Key Terms • Mass—a measure of the amount of matter • Volume—the amount of 3-D space an object occupies • Matter—anything that has mass and takes up space • Compound—a substance that is made from the atoms of 2 or more elements that are chemically bonded • Mixture—a blend of 2 or more kinds of matter. Each retains its own identity and property • Solubility—ability to dissolve something temperature dependant Building Blocks of Matter • Atom—the smallest unit of an element that maintains the properties of the element • Element—pure substance made of only one kind of atom
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Unformatted text preview: • Neutrons—most massive…NUCLEUS • Proton—middle massive…NUCLEUS • Electrons—least massive…OUTSIDE OF NUCLEUS • Cations: Positive IONS o Lose Electrons • Anions: negative IONS o Gain Electrons Properties and Changes in Matter • Extensive Properties—depend on the amount of matter that is present • Intensive Properties—do not depend on the amount of matter present Attractive Forces • Solids—greatest attractive forces • Liquid—can slide past each other • Gases—attractive forces are the lowest Symbols • Atomic # = # protons in nucleus • Atomic Mass – Atomic # = # of Neutrons • Atomic Mass = Protons + Neutrons • # Protons = # Electrons Periodic Table • Vertical ColumnsGROUPS • Horizontal RowsPERIODS • Group 17—HALOGENmost reactive non metals • Group 1—ALKALIreactive metals Noble Gases • Elements in Group 18 (Gases at room temperature) • Un-reactive • Stable...
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