Chapter 01 notes S10

Chapter 01 notes S10 - 1 Chapter 1 Introduction 2 Why Learn...

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1 Chapter 1 Introduction
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2 Why Learn Chemistry? To better understand the environment around us Medicine Understanding disease Develop new drugs Environmental Science Ozone layer Global warming Acid rain Agriculture Bioengineered food Fertilizers Criminal Justice Forensics Material Science Better built houses More efficient cars Plastics, composites
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3 Learning the Language Composition Mass percent of molecules present Molecular ratios within material Stoichiometry Structure Molecular arrangement Phase: s, l, g Properties Specific to a particular material (boiling point, color, odor, reactivity) Used for identification Chemistry defines materials and predicts molecular reactions based on 3 concepts
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4 The Scientific Method Series of steps that explain an observation Define the problem Perform experiments Develop hypothesis Perform Experiments Support or refute hypothesis Develop scientific laws Develop theory A balloon pops if overheated Perform experiments Gas expands when heated Heat balloon and observe V change Quantitatively measure Δ V vs. Δ T. Charles’ Law: V 1 /T 1 =V 2 /T 2 Kinetic Molecular Theory Molecules move faster when heated requiring more space, causing balloon to pop.
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5 Classifications of Matter What is in the material you are investigating?
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6 Matter Summary
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7 Pure materials Atom : Smallest distinctive unit Molecule : 2 or more atoms together Substance : Group of identical molecules Element: all atoms identical Compound: atoms vary
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8 Mixtures Mixture: Combination of 2 or more substances Homogeneous Mixture Substances stay mixed No distinct layers Also called a “solution” 14 karat gold Mixture of gold and silver Heterogeneous Mixture Substances separate Distinct layers often seen Iron filings and sand
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9 Physical and Chemical Properties of Matter Means of identification & separation of substances
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10 Physical Properties of Matter Physical Properties Color, odor, solubility, hardness, conductivity molecular mass, density, boiling/melting points No change to molecular composition
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Chapter 01 notes S10 - 1 Chapter 1 Introduction 2 Why Learn...

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