Chem Exam 1

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Author:
algarn2
ID:
234361
Filename:
Chem Exam 1
Updated:
2013-09-11 21:27:41
Tags:
chem intro
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Description:
not to hard
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  1. With extensive empirical evidence, a theory can become a law.
    False
  2. A hypothesis can be defined in multiple ways, such as a speculative law, immature theory, or a prediction
    True
  3. All work published within the scientific community is repeated to check the validity of the results.
    False
  4. Creativity plays no role in the practice of science
    False
  5. Science is not designed to answer moral, ethical, and aesthetic questions
    True
  6. How many significant figures does the following value have?

    42,000
    2
  7. Place the following number into scientific notation. Be sure the significant figures stay the same!

    0.0000850
    8.50 x 10^-5
  8. If the amount of gas and pressure are constant,when the temperature increases, the 
    volume of gas _________________.
    Increases
  9. If the amount of gas and the temperature are constant, when the volume decreases, the
    pressure __________________.
    Increase
  10. If the amount of gas and volume are constant,
    when the temperature increases, the pressure ___________________.
    Increase
  11. Consists of more than one type of atom
    chemically combined in a fixed ratio.
    Compound
  12. Consists of one type of atom
    Element
  13. Consists of more than one type of substance physically combined
    Mixture
  14. Examples include iron, magnesium, and copper
    Element
  15. iron rusting
    Chemical
  16. dissolving sugar in hot tea
    physical
  17. using an antacid (TUMS, ROLAIDS, etc) to neutralize excess stomach acid
    chemical
  18. was an idea introduced in Rutherford’s atomic model
    An atom is mostly open space but has a region of concentrated positive charge
  19. Consider Dalton’s Postulates on the nature of
    matter
    • a. All matter is composed of small, indivisible
    • particles called atoms.

    b. All atoms of a given element are identical in mass and properties
  20. What do the following atoms all have in common?  (Ca = calcium)

                       Ca+2, Ca-40, Ca-41
    number of protons
  21. How many neutrons are present in the Li-6 isotope? (Li = Lithium)
    3
  22. How many electrons are in a Ba2+ ion? (Ba = barium)
    54
  23. Which element has the following electron configuration: 1s^2 2s^2 2p^6 3s^2 3p^3

    and how many valence electrons
    P, phosphorus

    5
  24. statements explaining the behavior of ideal gases is FALSE
    Gas particles exert significant attractive forces upon one another
  25. A photon of which type of electromagnetic radiation has the highest energy
    gamma rays
  26. statements about bonding is FALSE
    Ionic compounds exist as discrete molecules

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