CHM 1040: Final 1/4

  1. Chemistry is relevant to which of the following areas of study?






    D) Biological studies
  2. 2.



    ______ is an example of a derived unit - a unit built up from standard units.





    D) Volume in m3
  3. Which is not an example of chemistry at work?





    E) A rock breaks a mirror

    This involves a physical, not a chemical change.
  4. Among other things, chemists have learned ______.





    • B) critical thinking.
    • Critical thinking is critical.
  5. A quantitative observation:




    C) is a measurement.

    Measurements require numbers.
  6. By definition, a mixture has variable





    B) composition
  7. Why is a gas much more compressible than a solid?





    B) Gases are mostly empty space.
  8. Gases have a definite shape.

    A) True
    B) False
    B) False

    A gas will fill any container completely, no matter what its shape.
  9. An approximation:




    D) is sometimes used to simplify science.
  10. Air is





    B) a homogeneous mixture.

    Air is a homogenous mixture in one phase (gaseous).
  11. A set of hypotheses is called a(n)




    C) a model or theory
  12. Heating 512 g of iron from 500ºC to 533ºC requires _______ of heat. The specific heat of iron is 0.45 J/ºC g.





    D) 7600 J
  13. An absolute temperature scale





    D) is always positive.
  14. Arrange the density of a generic substance according to state.





    D) solid ? liquid > gas
  15. Which of the following statements is qualitative?




    A) That pizza smells good!
  16. A certain substance contains three different elements. It could be



    B) a compound.

    A compound contains two or more elements.
  17. Doing chemistry successfully requires




    D) practice solving problems.

    Practice familiarizes you with procedures.
  18. A(n) _______ gives one possible explanation for an observation.





    D) hypothesis
  19. A homogeneous mixture is





    D) the same throughout.

    A homogeneous mixture will be the same throughout at some level.
  20. A _______ may not be modified over time.




    A) natural law

    A natural law is an important conclusion, and is considered to be permanent
  21. Round the number 14.449 to three significant digits.





    C) 14.4
  22. The amount of energy required by a process depends upon





    C) all of these.

    The energy required depends upon all these things.
  23. The scientific method:





    B) is a methodical way to do chemistry.
  24. Which of the following is a quantitative observation?





    E) Water boils at 100 degrees Fahrenheit.
  25. Distillation requires





    D) a mixture.
  26. Chemistry is a(n) _______ science.





    D) experimental
  27. Determine the number of significant figures in the number 0.0250015.





    B) 8
  28. Which of the following is not a hypothesis?





    C) Driving a car is faster than walking.
  29. A scientific test is called a(n)





    D) experiment
  30. How many cubes, each of volume 1mL, will be needed to fill up a 15L container?





    E) 15000
  31. Physical methods




    A) allow separation of mixtures.
  32. When magnesium metal burns,





    B) it is a chemical change.
  33. Filtration will separate

    A) a homogeneous mixture.B) substances in an alloy.
    C) a gas from a liquid.
    D) a solid from a liquid.Feedback: Right!
    E) water from an aqueous solution.
    D) a solid from a liquid.

    The filter will hold back the solid.
  34. It takes the same amount of energy to heat 100 g of water from
    50ºC to 100ºC as it takes to heat 100 g of water from 500ºC to 550ºC.

    A) True
    B) False
    A) True

    The amount of energy required doesn't depend upon the beginning or ending temperature of the water.
  35. An alloy is not a mixture.

    A) True
    B) False
    B) False

    An alloy is a homogeneous mixture of metals.
  36. Debate in science:




    B) provide a way to air and modify theory.

    Debate is a natural part of the scientific method.
  37. The standard (SI) unit of length is the _______.





    B) meter
  38. Sand and oil would form





    E) a heterogeneous mixture.

    Heterogeneous means (at least) two phases.
  39. How many gallons of water is 1750 mL? 1 gal = 4 qt; 32 oz = 1 qt; 29.6 mL = 1 oz.





    C) 0.46 gal
  40. Uncertainty is measurement is:




    B) unavoidable and expected.
  41. The prefix "d" means





    E) 0.1
  42. The SI unit of energy is defined as:





    A) the joule.
  43. A substance that cannot be broken down into another substance is called





    E) an element.
  44. Which of the following is a chemical property of copper?





    C) Copper turns green when exposed to air.
  45. Which of the following is not representative of a physical property?





    D) Water reacts with sodium metal.
  46. A qualitative observation:




    B) is a general description.
  47. A physical change





    E) could be a phase change.
  48. Experiments are performed to




    D) offer support to a theory
  49. Given a specific number of significant figures, how many uncertain digits exist in a measurement?





    B) 1
  50. Convert -151ºC to fahrenheit.





    D) -240ºF
  51. With regards to significant figures, the main difference between zeroes and non-zero numbers is:




    D) zeroes are sometimes significant, and non-zero numbers are always significant.
  52. Determine the density of a new material if 2.81 grams displace a 0.56 mL volume of water.




    D) 5.02 g/cm3
  53. What volume of mercury will weigh the same as 150 mL of water?
    The density of water is 1.0 g/mL, and the density of mercury is 13.6
    g/mL.





    C) 11.0 mL
  54. Learning chemistry has been compared to learning a foreign language.

    A) True
    B) False
    A) True

    It is certainly a symbolic language such as algebra.
  55. Scientific models:




    A) are useful tools in science.
Author
kieu
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81834
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CHM 1040: Final 1/4
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CHM 1040: Final 1/4
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