Chemistry Midterm Part 2

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iPhenom
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206901
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Chemistry Midterm Part 2
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2013-03-12 22:39:45
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Chemistry midterm
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  1. The chemical formula f a compound indicates ____.
    the relative proportions of the elements in the compound
  2. Which of the following changes to a metal is a chemical change?

    A.) bending
    B.) rusting
    C.) polishing
    D.) melting
    B.) rusting
    (this multiple choice question has been scrambled)
  3. Which of the following involves a chemical change? 

    A.) mixing
    B.) melting
    C.) grinding
    D.) decomposing
    D.) decomposing
    (this multiple choice question has been scrambled)
  4. The diameter of a carbon atom is 0 000 000 000 154 m. What is this number expressed in scientific notation?

    A.) 1.54 * 10-10 m
    B.) 1.54 * 1010 m
    C.) 1.54 * 1012 m
    D.) 1.54 * 10-12 m
    A.) 1.54 * 10-10 m
    (this multiple choice question has been scrambled)
  5. The expression of 5008 km in scientific notation is _____.

    A.) 5.008 * 103 km
    B.) 50.08 * 10-4 km
    C.) 5.008 * 10-3 km
    D.) 5.008 * 104 km
    A.) 5.008 * 103 km
    (this multiple choice question has been scrambled)
  6. What is the result of multiplying 2.5 * 1010 & 3.5 * 10-7?

    a.) 8.75 * 10-3
    b.) 8.75 * 1017
    c.) 8.75 * 103
    d.) 8.75 * 10-17
    c.) 8.75 * 103
  7. What is the result of adding 2.5 * 103 & 3.5 * 102?

    a.) 2.9 * 103
    b.) 6.0 * 103
    c.) 2.9 * 102
    d.) 6.0 * 105
    • a.) 2.9 * 103
  8. The closeness of a measurement to its true value is a measure of its ___.
    accuracy
  9. Which of the following measurements contains 2 significant figures?

    A.) 0.004 04 L
    B.) 0.004 40 L
    C.) 0.004 00 L
    D.) 0.000 44 L
    D.) 0.000 44 L
    (this multiple choice question has been scrambled)
  10. Which of the following measurements is expressed to 3 significant figures?

    A.) 7.30 10-7
    B.) 0.007 m
    C.) 7077 mg
    D.) 0.070  mm
    A.) 7.30 10-7
    (this multiple choice question has been scrambled)
  11. How many significant figures are in the measurement 0.003 4 kg?
    2
  12. How many significant figures are in the measurement 811.40 grams?
    5
  13. The chief advantage of the metric system over other systems of measurement is that it ____.
    is in multiples of 10
  14. What is the SI unit for mass?
    kilogram
  15. Who was the man who lived from 460 B.C - 370 B.C. and was among the first to suggest the idea of atoms?
    Democritus
  16. The smallest particle of an element that retains the properties of that element is a(n) _____.
    atom
  17. Evidence about Dalton's atomic theory has shown that
    atoms are divisible

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