Week 1 Lectures - Chem 139

Week 1 Lectures - Chem 139 - 3/14/10 What is Chemistry? Oh,...

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Unformatted text preview: 3/14/10 What is Chemistry? Oh, right ! 3/14/10 What is Chemistry? The study of matter/energy and its transformations 3/14/10 33 What is Matter? Anything that has mass and occupies space 3/14/10 44 Chemistry involves the study of matter on the molecular/atomic scale Powers of 10 Animation http://micro.magnet.fsu.edu/primer/java/scienceopticsu/powersof10/ Just how small are we talking? 3/14/10 55 Chemists talk and think about matter in three different ways: 1. Macroscopic 2. Particulate 3. Symbolic 3/14/10 Thinking About Matter 1. Macroscopic B ig enough to see color, texture, phase, shape, etc. (> 1 micrometer) 3/14/10 Thinking About Matter 2. Particulate Too small to see, but represented by pictures of chemical structure = sulfur = water 3/14/10 Thinking About Matter 3. Symbolic Letters and numbers that represent chemical structures, chemical colors, chemical reactions H2O Fe2O3 3/14/10 Types of matter Atoms- Tiny building blocks of all matter Molecules Two or more atoms connected by strong chemical bonds 3/14/10 1010 Classification of Matter There are 2 types of matter: Element : composed entirely of atoms (all identical particles) cannot be decomposed into other pure, stable substances Compound: composed entirely of molecules (all identical particles) made of two or more different types of atoms can be decomposed into constituent elements or other compounds And they can be mixed together, too! Mixtures are composed of different kinds of atoms or molecules. Mixtures can be separated into constituent elements and/or compounds 3/14/10 Water Molecule Oxygen Atom Hydrogen Atom Hydrogen Atom A Compound Made of Two Elements 3/14/10 1212 Some pictures of elements Fluorine (F2): gas at rm. temp. Chlorine (Cl2): gas at rm. temp. Bromine (Br2): liq/ gas at rm. temp. Iodine (I2): solid/gas at rm. temp. Sulfur, S8 Carbon (C) nanotubes Osmium (Os) metal. The densest element!! d = 22.61 g/cm3 3/14/10 1313 Carbon dioxide (CO2) Copper sulfate, CuSO4 crystalline solid Potassium bromide, KBr Obsidian, volcanic glass. 7075% SiO2, plus MgO, Fe3O4 amorphous solid Some pictures of 3/14/10 What Type of Matter? C11H2 2O11 (Sugar) CHEM 161, W09; Ch 1- 4 Review 1515 Elements or Compounds? 1. Na2S 2. Br2 3. Potassium Hydroxide 4. Fluorine compound compound compound element element element 5. 6. 3/14/10 1616 Gallium metal, an element Alloy (a mixture) of gallium, indium, and tin...three different elements Mixtures can be hard to 3/14/10 1717 Pure Substances vs Mixtures Pure substances cannot be separated into different components by physical means. Mixtures can be separated into different components. The unique properties of the components of a mixture can be used to separate the components. 3/14/10 1818 Homogeneous vs Heterogeneous Mixtures A Homogeneous Mixture is a mixture that has a uniform appearance and composition throughout A Heterogeneous Mixture is a mixture in which you can identify the component parts just by looking at it...
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Week 1 Lectures - Chem 139 - 3/14/10 What is Chemistry? Oh,...

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