1A1PPT - Chemistry 1A Chapter 1 What I’d be doing if I...

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Unformatted text preview: Chemistry 1A Chapter 1 What I’d be doing if I were you… • To prepare for lecture – Read pdf file for Chapter 2 of An Introduction to Chemistry (link on the Chemistry 1A webpage) http://www.preparatorychemistry.com/Bishop_Book_2_eBook.pdf – Or read Chapters 1 and 2 in the text. What you want in front of you. • Chapter 1 of the booklet • The copies of my PowerPoint slides. Chemistry The science that deals with the structure and behavior of matter Scientific Models • Scientific models are simplified but useful representations of something real. Kinetic Molecular Theory • All matter is composed of tiny particles. • The particles are in constant motion. • Increased temperature means increased motion. • Solids, liquids and gases differ in the freedom of motion of their particles and in how strongly the particles attract each other. Solid • Constant shape and volume • The particles are constantly moving, colliding with other particles, and changing their direction and velocity. • Each particle is trapped in a small cage whose walls are formed by other particles that are strongly attracted to each other. The Nature of Solids Liquid • Constant volume but variable shape • The particles are moving fast enough to break the attractions between particles that form the walls of the cage that surround particles in the solid form. • Thus each particle in a liquid is constantly moving from one part of the liquid to another. Liquids Evaporation Gas • Variable shape and volume • Large average distances between particles • Little attraction between particles • Constant collisions between particles, leading to constant changes in direction and velocity The Nature of Gases Separation of Salt Water Elements, Compounds, and Mixtures • Element: A substance that cannot be chemically converted into simpler substances; a substance in which all of the atoms have the same number of protons and therefore the same chemical characteristics. • Compound: A substance that contains two or more elements, the atoms of these elements always combining in the same whole-number ratio. • Mixture: A sample of matter that contains two or more pure substances (elements and compounds) and has variable composition. Distillation Classification of Matter 114+ Known Elements • 83 are stable and found in nature. – Many of these a very rare. • 7 are found in nature but are radioactive. • 24+ are not natural on the earth. – 2 or 3 of these might be found in stars. Elements and Compounds Exhaust – a Mixture Scientific Method ...
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This note was uploaded on 03/03/2012 for the course CHEM 100 taught by Professor Mark during the Fall '06 term at Monterey Peninsula College.

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