Chem Chapter 1

Chem Chapter 1 - Chapter 1 Chemical Foundations Main...

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Chapter 1 Chemical Foundations
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Main challenge of chemistry To understand the connection between the macroscopic world that we experience and the microscopic world of atoms and molecules. You must learn to think on the atomic level .
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Atoms vs. Molecules Matter is composed of tiny particles called atoms. Atom: smallest part of an element that is still that element. Molecule: Two or more atoms joined and acting as a unit.
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Oxygen and Hydrogen Molecules
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A Chemical Reaction One substance changes to another by reorganizing the way the atoms are attached to each other.
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Units of Measurement Measurement? Quantitative observation consisting of two parts. Number (size) Scale (unit) 20 grams 500 mL
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Units of Measurement Fundamental SI Units Physical Quantity Name of Unit Abbreviation Mass Kilogram kg Length Meter m Time Second s Temperature Kelvin/ Deg Celsius K/ °C Volume Liter L Amount of substance mole mol
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Units of Measurement Prefixes Used to change the size of a unit
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Volume of a cube
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Unit Conversions Example 1. A golfer putted a golf ball 6.8 ft across a green. How many inches does this represent? 1 ft = 12 in 12 in 1 ft × 6.8 ft = 82 in
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Solving Multi-step Unit Conversions Problems Not all calculations can be done in one step Every step will have its own conversion factor Example 2. 194 cm = ? Ft • Solution map: cm in. ft. • Conversion factors: 1 in. = 2.54 cm; 1 ft. = 12 in. 194 cm 2.54 cm 1 in 1 ft 12 in = 6.36 ft
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Can we solve this problem? Example 3. The speed limit is 65 mi/hr. What is this in m/s?
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Chem Chapter 1 - Chapter 1 Chemical Foundations Main...

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