sig fig

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studysuccess
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173496
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sig fig
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2015-04-05 14:03:06
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chapter slides significant figures chemistry 121
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ch 2 slides, sig fig
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  1. what is a sig fig
    number of digits that are known plus 1 estimated digit
  2. how many sig figs do exact numbers have
    infinite
  3. how many sig figs do defined numbers have
    they're exact (100 cm=1m).
  4. are all non-zero numbers significant
    yes
  5. zeros to the left of nonzero numbers (are/are not) significant before or after a decimal?
    0.0032 or 003200
    • not significant
    • 2 sig figs
  6. zeros between sig digits are/are not significant
    502.001
    • are significant
    • 6 sig figs
  7. are zeros at the end of a number and to the right of a decimal significant? 5.00
    yes.  there are 3 sig figs.
  8. Is a zero significant when it's to the right of a nonzero number and to the left of an implied decimal point
    6200
    no, there are only 2 sig figs
  9. how many sig figs do exact conversions have
    • all numbers in exact conversions are significant
    • (except 0's that are place holders).
  10. 0's to the right of a nonzero number and left of a decimal point are/are not significant?
    55300.0
    are significant. there are 5 sig figs
  11. what's the rule if the digit to be dropped is greater than 5?
    round up
  12. if the digit to be dropped is less than 5 round...
    round down
  13. if the digit to be dropped is exactly 5 without numbers to the right...
    • the number to the left is used for rounding. 
    • If odd, round up
    • if even, it remains 5.
  14. where is the proper place for a decimal in scientific notion
    after the first nonzero digit
  15. what's the rule about calculating sig figs
    the result of the calculation cannot be more percise than the lease percise measurement in the calculation.
  16. how many sig figs 190.6 X 2.3=438.28
    drop the last 3 digits to get 440, because you round up first.  Correctly written as 4.4 X10^2
  17. when adding and subtracting it is important that the resulting number be rounded to have the same amount of decimal places as the value with the ____  decimal places.
    125.17
    129.
    52.2
    +
    ---
    306.
    fewest decimal places.  Number rounded down after the decimal=306 or correctly written as 3.06X10^2
  18. calculate (1.039-1.020)/1.039=
    0.018 or 1.8X 10^-2
  19. SI system basic measure of length
    meters
  20. SI measure of mass
    kilogram
  21. Si unit of measure of temp
    kalvin K
  22. SI unit of measure tim
    second s
  23. SI unit of measure of substance
    mole m
  24. SI unit measure of electric current
    ampere A
  25. SI unit measure of luminous intensity
    candela cd
  26. exe E is the numerical value for SI
    10^18
  27. Penta P is SI value for
    10^15
  28. tetra T is the SI value for
    10^12
  29. giga is the SI value for
    10^9
  30. mega is the SI value for
    10^6
  31. kilo is the SI value for
    10^3
  32. hecto h is the SI value for
    10^2
  33. da is the SI value for
    10^1
  34. deci d is the SI value for
    10^-1
  35. centi c is the SI value for
    10^-2
  36. milli m is the SI value for
    10^-3
  37. micro is the SI value for
    10^-6
  38. nano n is the SI value for 
    10^-9
  39. pico p is the SI value for
    10^-12
  40. femto f is the SI value for
    10^-15
  41. atto a is the SI value for
    10^-18

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