Che100 Practice Test 1

OCC AH Chemistry

To answer the questions below click on the button which represents the correct response or enter a short answer. Then click "submit" to send your answers. Exponents are represented as e and a signed value. For example, 1000 is 1e3 and 0.001 is 1e-3. Subscripts are not available so use regular numbers instead. When you enter a numerical answer, do not enter letters (like g, grams, mol etc).

  1. Simple statements of natural phenomena to which no exceptions are known under the given conditions are known as:

    2. Your answer:
    theories.
    scientific laws.
    hypotheses.
    absolute truths.

  2. The first step in the scientific method should always be:

    3. Your answer:
    formulation of a hypothesis.
    derivation of tests or experiments to check your preconceived notions.
    collection of data.
    none of the above are correct.

  3. At one atmosphere of pressure, what is the boiling point of water in °F, °C and K, respectively?

    4. Your answer:
    32°F, 0°C, 273 K
    100°F, 38°C, 311 K
    212°F, 100°C, 373 K
    373°F, 189°C, 462 K

  4. As you heat most materials, especially gases, their density:

    5. Your answer:
    increases.
    decreases.
    stays the same.
    first increases, then decreases.

  5. In the metric system the correct word equivalents, left to right, for the measurements 1000 g, 0.001 g and 0.000001 g would be:

    6. Your answer:
    milligram, kilogram, centigram.
    kilogram, centigram, milligram.
    microgram, milligram, kilogram.
    kilogram, milligram, microgram.

  6. Which of the following situations won't result in a homogeneous mixture?

    7. Your answer:
    Addition of skim milk to whole milk followed by stirring.
    Addition of sugar crystals to water followed by stirring.
    Addition of oil to water followed by stirring.
    Addition of salt to water followed by stirring.

  7. Which of the following statements concerning chemical elements are not true?

    8. Your answer:
    They are composed of smaller components of matter called atoms.
    They can't be broken down into simpler substances by chemical means.
    They are unequally distributed in nature.
    They number in the thousands.

  8. Which of the following elements doesn't exist as a diatomic molecule?

    9. Your answer:
    copper
    oxygen
    chlorine
    nitrogen

  9. Which one of the following compound choices contains the most total atoms?

    10. Your answer:
    H2SO4
    Fe2O3
    4NaCl
    2H2O

  10. Based on our classroom discussion, which one of the following materials would be classified as amorphous?

    11. Your answer:
    salt
    sugar
    copper tubing
    glass

  11. Express 60,000 in scientific notation (two significant figures). Use e with a signed value to represent the exponent.

    12. Your answer:

  12. Express 0.01694 in scientific notation (two significant figures). Use e with a signed value to represent the exponent.

    13. Your answer:

  13. Write 4.69 e-5 in ordinary (non-scientific notation) numbers.

    14. Your answer:

  14. Write 3.74 e5 in ordinary (non-scientific notation) numbers.

    15. Your answer:

  15. Round 366 to one significant figure.

    16. Your answer:

  16. Round 34395 to three significant figures.

    17. Your answer:

  17. Round 0.4316 to one significant figure.

    18. Your answer:

  18. Round 49,000,000 to two significant figures.

    19. Your answer:

  19. Round 0.00687 to two significant figures.

    20. Your answer:

  20. Solve 11.0 x 3.4000 to the correct number of significant figures =

    21. Your answer:

  21. Solve 6.945 + 0.02 to the correct number of significant figures =

    22. Your answer:

  22. Given that light (in a vacuum) travels at a speed of 186,000 miles/second, calculate (to three significant figures) how far light would travel (in miles) in a vacuum in one year. (You must use dimensional analysis.)

    23. Your answer:

  23. Given that 1 kilogram equals 2.2 pounds, convert 130 pounds to kilograms (two significant figures) =

    24. Your answer:

  24. Given that one inch equals 2.54 centimeters, convert 72 inches to centimeters (two significant figures) =

    25. Your answer:

  25. Assume that the Sun is located 9.30 e 7 miles from Earth and that light travels 186,000 miles per second. Calculate how long in minutes (three significant figures) it takes light from the Sun to reach the Earth. (You must use dimensional analysis.)

    26. Your answer:

  26. Convert 16°C to °F (two significant figures) =

    27. Your answer:

  27. Convert 110°F to °C (two signifcant figures) =

    28. Your answer:

  28. A block of ice has dimensions of 7.5 cm, 7.5 cm and 4.5 cm, and a mass of 228 g. Calculate the density of the ice with the proper number of significant figures.

    29. Your answer:

  29. Give the correct chemical symbol for calcium.

    30. Your answer:

  30. Give the correct chemical symbol for carbon.

    31. Your answer:

  31. Give the correct chemical symbol for manganese.

    32. Your answer:

  32. Give the correct chemical symbol for mercury.

    33. Your answer:

  33. Give the correct chemical symbol for neon.

    34. Your answer:

  34. Provide the correct name for O; use lower case letters for this and other similar questions.

    35. Your answer:

  35. Provide the correct name for Ag.

    36. Your answer:

  36. Provide the correct name for H.

    37. Your answer:

  37. Provide the correct name for Al.

    38. Your answer:

  38. Provide the correct name for Pb.

    39. Your answer:

  39. Indicate whether potassium is a compound, element, or mixture.

    40. Your answer:

  40. Indicate whether water is a compound, element, or mixture.

    41. Your answer:

  41. Indicate whether soil is a compound, element, or mixture.

    42. Your answer:

  42. Indicate whether salt is a compound, element, or mixture.

    43. Your answer:

  43. Indicate whether zinc oxide is a compound, element, or mixture.

    44. Your answer:

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