Chem Exam (part 1)

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  1. Density (d)
    • Ratio of mass (m) of an object to its volume (v)
    • d= m/v
  2. Zeros at the beginning are...
    • NEVER significant (place holder)
    • 0.0592 (3sf)
  3. Zeros at the end after decimal point...
    • ALWAYS significant 
    • 2.00x10³ (3sf)
    • 9.6500 (5sf)
  4. Zeros at the end without decimal point...
    • NEVER significant
    • 96,500 (3sf)
    • 200 (1sf)
  5. Zeros between non-zero digits...
    • ALWAYS significant 
    • 102.3 (4sf)
    • 202 (3sf)
  6. MASS conversion factors (4)
    • kg
    • lb
    • oz
    • g
  7. LENGTH (distance) conversion factors (7)
    • m
    • yd
    • ft
    • in
    • cm
    • km
    • mi
  8. VOLUME conversion factors (5)
    m³, ft³, L, gal, qt
  9. Precision
    • Indicates how repeatable a measurement is
    • EX: 253g
    •     2.5270, 2.5271,2.5272
  10. Accuracy
    • Reflects how close the measured value is to the true value
    • EX: mass of penny= 2.5267g
    •     ->accurate to within 0.0001g of the true value
  11. Freezing point (3)
    • 32 °F
    • 0 °C
    • 273K
  12. Boiling Point (3)
    • 212 °F
    • 100 °C
    • 373K
  13. °F-> °C
    °C= 5/9 (°F-32)
  14. °C -> °F
    °F= 9/5 (°C) + 32
  15. °C -> K
    K= °C + 273.15
  16. K -> °C
    °C= K-273.15
  17. Zetta
    • Z
    • 10²¹
  18. Exa
    • E
    • 10^18
  19. Peta
    • P
    • 10^15
  20. Tera
    • T
    • 10^12
  21. Giga
    • G
    • 10^9
  22. Mega
    • M
    • 10^6
  23. Kilo
    • k
    • 10³
  24. Hecto
    • h
    • 10²
  25. Deka
    • da
    • 10¹
  26. Deci
    • d
    • 10^-1
  27. Centi
    • c
    • 10^-2
  28. Milli
    • m
    • 10^-3
  29. Micro
    • µ
    • 10^-6
  30. Nano
    • n
    • 10^-9
  31. Pico
    • p
    • 10^-12
  32. Femto
    • f
    • 10^-15
  33. Atto
    • a
    • 10^-18
  34. Zepto
    • z
    • 10^-21
  35. Average Atomic Mass (4)
    • Weighted average of all isotopes of an element
    • mx= a1m1+ a2m2+ a3m3
    • a:natural abundance
    • m: mass of isotopes
  36. Seven Base Units
    • 1.) Mass:kilogram-kg
    • 2.) Length: Meter-m
    • 3.) Temperature: kelvin-K
    • 4.) Time: second-s
    • 5.) Energy: joule-J
    • 6.)Electrical current: ampere-A
    • 7.) Amount of Substance: mole- mol
  37. Micro scale units (3)
    • Milli (m)= 10^-3
    • Micro (µ)= 10^-6
    • Nano (n)= 10^-9
  38. Micro scale unit conversions (3)
    • 1mm= 10^-3m // 1m=1000mm
    • 1µm= 10^-6m // 1m= 10^6µm
    • 1ng= 10^-9g // 1g= 10^9ng
  39. Volume (3)
    • derived from length
    • Volume= l⋅w⋅h // 1cm⋅1cm⋅1cm=1cm³
    • 1 cm³= 1mL= 1cc
  40. Density (2)
    • Derived from mass & volume
    • Density= mass/volume= g/mL= g/cm³= 1lb/gallon
  41. Alkali Metals- Group 1 (3)
    • Soft, highly reactive
    • Form cations- +1 charge
    • EX: H+, Cl+, Rb+
  42. Alkali Earth Metals- Group 2(3)
    • Earth's crust
    • Form cations- 2+ charge
    • EX: Be^2+, Ca^2+
  43. Transition Metals- Group 3-12
    • Form cations- various charges
    • EX: Cu+, Cu^2+
  44. Group 13
    • Ionize to 3+ cations (except boron)
    • EX: Al^3+, Ge^3+
  45. Halogens- Group 17
    • form -1 anions
    • EX: F-, Cl-, Br-
  46. Noble Gases- Group 18 (2)
    • Unreactive
    • Mono-atomic-> occur by themselves
  47. Empirical formula
    • Atomic symbols, but smallest whole number ratios
    • EX: Glucose: 6C+12H+6O -> CH6O
  48. Cation
    • (+) ion
    • Smaller than neutral atom
  49. Anion
    • (-) ion
    • Larger than neutral atom
  50. Naming Binary Molecular Compounds
    • First element in the formula is named first
    • 2nd element name is changed by adding suffix -ide 
    • Add prefixes to identify quantity of atoms
  51. Matter
    Occupies space & has mass
  52. Mass
    Defines the quantity of matter in an object
  53. Energy
    Capacity to do work
  54. Pure Substance
    Same chemical/ physical properties throughout
  55. Element
    Can't be separated into simpler species by chemistry
  56. Compound
    2 or more components bonded together that can be broken down into simpler species by chemistry (not physical means)
  57. Mixture
    Combination of 2 or more pure substances
  58. Homogenous Mixture
    Uniform components, no visible boundaries
  59. Heterogenous Mixure
    Not uniform, look different
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315421
Card Set
Chem Exam (part 1)
Description
important things to know for the first exam
Updated
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