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Week 5 Quiz
  • 1. Which number represents

    4.56x105
A) 45600
B) 456
C) 4560
D) 456000
  • 2. How many significant figures in:

    0.00564g
A) 5
B) 2
C) 3
D) 6
  • 3. How many significant figures in:

    0.0301g
A) 3
B) 4
C) 2
D) 5
  • 4. Which number represents:

    1.2x10-1
A) 120
B) 1.2
C) 12
D) 0.12
  • 5. Use your calculator:

    4.56x106 x 2.13x109
A) 97128000
B) 9712800000000000
C) 97128000000
D) 97128000000000
  • 6. What is the difference between

    4.00x101kg

    and

    40kg
  • 7. If my scales are precise to 3 digits and give a mass of 2.13g and the volume of my substance is 25ml:

    What is the density of the substance?
A) 0.08g/ml
B) 0.0852g/ml
C) 0.085g/ml
D) 8.52x10-2
  • 8. If my scales are precise to 3 digits and give a mass of 2.13g and the volume of my substance is 25ml:

    How many significant figures should my density have?
A) 3
B) 5
C) 4
D) 2
  • 9. Why do we find percent error in chemistry?
  • 10. I attempted to find the density of a piece of metal - three times:
    1.212g/cm3
    1.201g/cm3
    1.230g/cm3

    The real density was 2.18g/cm3

    Comment on both my precision and accuracy.
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