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Chemistry Review

Chemistry Review. Properties of Glass and Soil. Physical and Chemical Properties. Physical. Chemical. Physical and Chemical Changes. Physical. Chemical. Forensic Tests. How do we determine order of tests? Broad  Narrow Tests that alter or destroy evidence last. Metric System.

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Chemistry Review

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  1. Chemistry Review Properties of Glass and Soil

  2. Physical and Chemical Properties Physical • Chemical

  3. Physical and Chemical Changes • Physical • Chemical

  4. Forensic Tests • How do we determine order of tests? • Broad  Narrow • Tests that alter or destroy evidence last

  5. Metric System • Based on powers of 10 • k h D b d c m • Liter, gram, meter • Useful English to metric conversions 1 in = 2.54 cm 1 m = 39.37 in 1 pound = 453.6 g 1 liter = 1.06 qt 1 kg = 2.2 pounds 1 mL = 1 cm3

  6. PRACTICE • 15 mm = ? cm 25 in = ? cm • 25 km = ? m 50.0 m = ? ft • 13 g = ? mg 200.0 lb = ? kg • 0.050 L = ? mL 2.0 L = ? cm3

  7. Temperature • Measure of heat or kinetic energy • Scale requires 2 reference points (MP, BP)

  8. Weight and Mass • W = m x g • Not the same • proportional

  9. Density • D = m/v • Intensive property • Gas and liquid vary w/temp

  10. Refractive Index • Speed of light • Waves slow when they come into contact with another medium • Bending is a result of change in velocity – refraction Refractive index = velocity of light in a vacuum velocity of light in a medium • Specific wavelength and temp

  11. Crystalline vs Amorphous • Arrangement of atoms • Definite and orderly • Random arrangement

  12. Some other properties of light • Double refraction • Birefringence • Dispersion

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