2 chem student notes (1).docx - Chapter 2 MATTER AND ENERGY...

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Chapter 2 MATTER AND ENERGY Memorize the following Mg Ba Fr Th Cs Al Ra Np As Ar Pt Ni A Scientific notation Very large and small numbers are often written in scientific notation. Numbers are written M x 10 n M- Numbers from 1 to 9 Write 56000 in scientific notation: Write .0023 in scientific notation: start a 3:30 B Significant digit or figures (sig figs) - digits in a measurement that are known with certainty. The last significant digit is considered to not to be totally certain. (see hand out) into to sig figs How many significant digits do the following have? 1.1 WHAT IS ENERGY KE and PE A. Energy : ability to do work or cause change Types of energy ( a few examples)
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Chemical Electrical Mechanical Elastic B All energy is classified Kinetic energy- motion Potential energy- energy due to position C Law of Conservation of Energy Energy is neither created nor destroyed but is transformed. Now we call it the law of conservation of mass and energy because of E=mc 2 PE and KE 2.2 HEAT AND TEMPERATURE A Temperature scales 1. In the Fahrenheit scale water freezes at 32° and boils at 212°F Proposed in 1724 by the Polish-born German physicist Daniel Gabriel Fahrenheit. The lower defining point, 0 °F, was established as the temperature of a solution of brine made from equal parts of ice and salt. Further limits were established as the melting point of ice (32 °F) and his best estimate of the average human body temperature .
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  • Fall '19
  • Rene Bishop
  • Energy, Kelvin, Law of Conservation of Energy Energy

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