Ch. 2 - Silberberg, Chapter 2 The Components of Matter 2.1...

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Silberberg, Chapter 2 The Components of Matter (Review) 2.1 Elements, Compounds and Mixtures • Element: consists of only one kind of atom, a pure substance, whose composition is fixed. Elements have names (oxygen, carbon, silicon). • Molecule: individual elements that come together to form molecules, independent structural units chemically bonded together. •Compound: matter composed of two or more different elements that are chemically bonded together. Compounds have different properties than the elements that make them up. •Mixture: a group of two or more substances (elements and/or compounds) that are physically intermingled. The components in a mixture can vary in their parts by mass, unlike compounds. Mixtures retain the physical properties of its components. 2.2. The Atomic View of Matter A. Mass Conservation: the total mass of substances does not change during a chemical reaction. B. Definite Composition: no matter what its source, a particular chemical compound is composed of the same elements in the same parts (fractions) by mass. (i.e. mass fraction) C. Multiple Proportions: if elements A and B react to form two compounds, the different masses of B that combine with a fixed mass of A can be expressed as a ratio of small whole numbers. 2.5 Atomic Theory • Atomic number: for an element, the number of protons in the nucleus of its atom. • Mass number: the total number of protons and neutrons of an atom (i.e.
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This note was uploaded on 06/15/2010 for the course CHEM 124 taught by Professor Hascall during the Winter '08 term at Cal Poly.

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Ch. 2 - Silberberg, Chapter 2 The Components of Matter 2.1...

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