lect_1sep26f08

lect_1sep26f08 - Outline 1 1 Why study Chemistry 4-JAN-2008...

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1 Outline 1 4-JAN-2008 1. Why study Chemistry? 2. Matter – Definition & Classifying, Skill: classify (substances vs. mixtures) Examples 3.Measurements, Numbers, Units Dimensional Analysis (Factor-Label method)
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2 Chemistry Why study chemistry? Used in all sciences from astronomy to zoology. Creation of thousands of new products. Vaccines and drugs. Greater food production. Find substitutes for scarce resources. Chemical reactions part of life itself: breathing, eating, thinking.
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3 Definition: (What Is Chemistry?) Chemistry: Study of matter . Includes changes in matter and accompanying changes in energy. Matter - anything that occupies space and has mass . Energy - “ability to do work.” Work – ability to move an object .
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4 Classifying Matter
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5 Substances and Mixtures Substance : Fixed composition as in pure elements and compounds. Ex: sodium, iron(III) oxide, sucrose Mixture: Variable composition, two or more substances. Ex: salt water, gasoline, milk, grape juice Separable into substances through physical processes.
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6 Substances and Mixtures Physical change : Change in form (state) but not in kind. Same substance. Can be reversed by just changing temperature. No new substances formed. Ex: Melting ice, H 2 O(s) → H 2 O(l) ice (solid) turns into water (liquid)
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7 Substances and Mixtures Chemical change ( reaction) : substance(s) changed into new substance(s). (May include change in state (physical change)). (Can’t be reversed by just changing temperature.) New substances formed.
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This note was uploaded on 02/18/2009 for the course CHEM 1A taught by Professor Okamura during the Fall '08 term at UC Riverside.

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lect_1sep26f08 - Outline 1 1 Why study Chemistry 4-JAN-2008...

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