Chem Unit1
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  • 1. If you’ve ever used nonstick pans Thank a chemist
  • 2. If you’ve ever used Velcro Thank a chemist
  • 3. If you’ve ever used sweeteners Thank a chemist
  • 4. If you’ve ever used Tylenol or Advil Thank a chemist
  • 5. If you’ve ever used dyed clothing Thank a chemist
  • 6. If you’ve ever used Nylon Thank a chemist
  • 7. If you’ve ever used gasoline Thank a chemist
  • 8. If you’ve ever had an MRI Thank a chemist
  • 9. If you’ve ever baked a cake Thank a chemist
  • 10. Physical vs. Chemical Change
  • 11. Physical vs. Chemical Change
  • 12. Physical vs. Chemical Change
  • 13. Physical vs. Chemical Change
  • 14. Physical vs. Chemical Change
  • 15. Physical vs. Chemical Change
  • 16. Physical vs. Chemical Change
  • 17. Physical vs. Chemical Change
  • 18. Describing Matter UNITS Quantity Symbol Unit Abbreviation Length L Meter m Mass m Kilogram kg Time t Second S Temperature T Kelvin K Amount of Substance n mole mol Electric current I Ampere A Luminous intensity Iv Candela cd
  • 19. Measurements SI units Système Internationale des Unités
  • 20. Describing Matter Prefixes Prefix Abbreviation Exponential multiplier Value example Yotta Y 10 24 septillion Zetta Z 10 21 sextillion Exa E 10 18 quintillion exabyte peta P 10 15 quadrillion tera T 10 12 trillion terabyte giga G 10 9 billion gigaHertz mega M 10 6 million Kilo K 10 3 thousand kilometer Base - 10 0 1
  • 21. Describing Matter Prefixes Prefix Abbreviation Exponential multiplier Value example deci d 10 -1 tenth decibel centi c 10 -2 hundredth centimeter milli m 10 -3 thousandth milligram micro μ 10 -6 millionth microsecond nano n 10 -9 billionth nanometer pico p 10 -12 trillionth picoHertz femto f 10 -15 quadillionth femtosecond atto a 10 -18 quintillionth attometer zepto z 10 -21 Sextillionth
  • 22. Measurements: Temperature Fahrenheit Celsius Kelvin 212° F 100°C 373 K Boiling point of water 32°F 0°C 273 K Freezing point of water -459.67°F -273°C 0 K Lowest possible temperature
  • 23. Derived Units Volume
  • 24. What is Matter? Anything that has mass and volume
  • 25. Pure or Mixture?
  • 26. Elements The Ancient Greeks recognized four different earthly elements
  • 27. Elements Pure Substance that contains only one type of atom
  • 28. Allotropes Different Molecular Form of Same Elemen; diamond and graphite
  • 29. Compounds Pure substances made of more than one type of atom Cl H
  • 30. Mixtures Heterogeneous Oil and water Milk
  • 31. Mixtures Homogeneous Salt water Sugar water
  • 32. Energy ENERGY is neither created nor destroyed .
  • 33. Energy .
  • 34. Heat Transfer . Energy transfer due to a difference in temperature
  • 35. Measurements: Temperature Fahrenheit Celsius Kelvin 212° F 100°C 373 K Boiling point of water 32°F 0°C 273 K Freezing point of water -459.67°F -273°C 0 K Lowest possible temperature
  • 36. Energy . Exothermic VS. Endothermic
  • 37. Specific Heat Capacity Q = m x C p x Δ T
  • 38. Specific Heat Capacity Specific Heat substance 4.18 J/gK water 0.9 J/gK Aluminum 0.126 J/gK Gold 0.51 J/gK Steel 2.9 J.gK Paraffin wax 1.0 J/gK Air
  • 39. Accuracy vs. Precision
  • 40. Accuracy How close is your measurement to the actual value??
  • 41. Precision How close is your measurements to each other?
  • 42. Significant Figures Any non-zero digit is Significant Any zero between non-zero digits is Significant All zeros to the left of the first non-zero digit are NOT significant Zeros that occur without a decimal point are NOT significant Zeros AFTER the decimal point are Significant