0%20Chem%201001%20review%20%20exam%201%20s%202012

0%20Chem%201001%20review%20%20exam%201%20s%202012 - Chem...

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Chem 1001 Review for exam 1 spring 2012
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2 Summary of Key Messages Chemistry is a wonderful topic because studying the topic helps you move up the Bloom Taxonomy pyramid; the higher you go on the pyramid the higher your income is likely to be. Chemistry gives you practical knowledge useful in understanding the everyday world around you and in making purchases. Chemistry combines both quantitative methods and concepts. Because the world is composed of chemicals and because there are so many elements and compounds, memory alone is not enough. You need to learn fundamental truisms. The macro world we can see gives us experience, but this experience takes us only so far (down to about nanoparticles) but even smaller particles have unique properties outside of our everyday experience. The fundamental unit, the atom, has subatomic particles: the proton, the neutron, and the electron. All have unique properties.
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Chemistry begins to define matter by two broad types: 1. Pure substance Only a single type of matter Table salt (sodium chloride) Table sugar (sucrose) 2. Mixture Two or more substances intermixed Mixture of salt and sugar Rocks (many different minerals present)
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Mixtures are further divided as follows: Homogenous mixture Homo- means “the same.” Composition of mixture is uniform throughout although ratios can be adjusted. Normal saline solution – NaCl (salt) dissolved in water (H 2 O). Heterogeneous mixture Hetero- means “different.” Composition is not the same throughout. Different samples will have different ratios of components. Different areas of rocks would have different mineral ratios.
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Types of substances Elemental substance Pure substance has only one type of atom Pure Gold is Au. • Oxygen in the air is O 2 . Compound Pure substance made of two or more different elements • Water (H 2 O) is made of hydrogen and oxygen.
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Matter and Its Physical Transformations Ice cubes slowly vanishing while stored in a freezer is an example of: (a) Vaporization (b) Condensation (c) Melting (d) Sublimation
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Chemical reaction —describes a chemical transformation DICTATED BY ELECTRONS!! 2
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This note was uploaded on 02/24/2012 for the course CHEM 1001 taught by Professor Staff during the Spring '08 term at LSU.

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0%20Chem%201001%20review%20%20exam%201%20s%202012 - Chem...

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