Che 1510 Practice Test 1

OCC AH Chemistry

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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 and superscripts are not available so use regular numbers instead. When you enter a numerical answer, do not enter letters (like g, grams, mole etc).

  1. Which of the following is not true about chemical elements?

    2. Your answer:
    They can't be altered chemically or by ordinary physical means.
    They may exist in forms called isotopes that differ from each other only by their neutron number.
    They number in the thousands.
    They can be grouped into metals, nonmetals and metalloids.

  2. Granulated salt stirred thoroughly into water should produce:

    3. Your answer:
    a homogeneous mixture.
    a heterogeneous mixture.
    a pure substance.
    a single compound.

  3. Metal element atoms tend to lose electrons to form ________________ while nonmetal element atoms tend to gain electrons to form ________________

    4. Your answer:
    cations, muons.
    cations, anions.
    anions, cations.
    dogions, cations.

  4. Atoms of 86-Rn-222 contain:

    5. Your answer:
    86 electrons, 86 neutrons, 222 protons.
    86 protons, 86 electrons, 136 neutrons.
    86 protons, 86 electrons, 86 neutrons.
    86 protons, 0 neutrons, 86 electrons.

  5. In our view of the nuclear atom, _____________, electrically positively charged subatomic particles, and ________________, electrically neutral subatomic particles, comprise the atom's dense central core, the _______________ while ______________, electrically negatively charged subatomic particles, are distributed around the core in space like a cloud.

    6. Your answer:
    protons, electrons, nucleus, neutrons.
    neutrons, protons, nucleons, electrons.
    protons, electrons, nucleons, neutrons.
    protons, neutrons, nucleus, electrons.

  6. Respectively, the terms megameter, kilometer and millimeter are equivalent to what numeric measures?

    7. Your answer:
    l0000 m, l00 m, 0.01 m
    l000000 m, l000 m, 0.001 m
    l000000 m, l00 m, 0.001 m
    l000000 m, l000 m, 0.0001 m

  7. The smallest whole number ratios of atoms in a chemical compound formula is provided by the:

    8. Your answer:
    molecular formula.
    empirical formula.
    formula unit.
    true formula.

  8. A simple statement of natural phenomena to which no exceptions have been observed under given conditions is known as a:

    9. Your answer:
    thesis.
    theory.
    hypothesis.
    scientific law.

  9. How many atoms of each element are present per formula unit of Ca3(P04)2? For this and similar questions, enter a numeral and chemical symbol for each element; separate the enties by commas.

    10. Your answer:
    3 Ca, 1 P, 4 0
    3 Ca, 2 P, 6 0
    3 Ca, 2 P, 8 0
    l Ca, 6 P, 24 0

  10. In the compound Na2CO3, the oxidation number (electrical charge) of carbon is:

    11. Your answer:
    2+
    3+
    4+
    5+

  11. Sugar is a compound. True or false?

    12. Your answer:
    TrueFalse

  12. Argon is an element. True or false?

    13. Your answer:
    TrueFalse

  13. Hot chocolate beverage is a heterogeneous mixture. True or false?

    14. Your answer:
    TrueFalse

  14. Chalk plus table salt is a ___________.

    15. Your answer:
    element.
    compound.
    homogeneous mixture.
    heterogeneous mixture.

  15. 435 expressed in scientific notation to two significant figures is 4.4e2. True or false?

    16. Your answer:
    TrueFalse

  16. 250 expressed in scientific notation to one significant figure is 2.0e2. True or false?

    17. Your answer:
    TrueFalse

  17. 4438 expressed in scientific notation to three significant figures is 4.44e3. True or false?

    18. Your answer:
    TrueFalse

  18. 0.1040 expressed in scientific notation to four significant figures is 1.040e-1. True or false?

    19. Your answer:
    TrueFalse

  19. 0.100095 expressed in scientific notation to two significant figures is 1.00e-1. True or false?

    20. Your answer:
    TrueFalse

  20. Convert 25°C to °F.

    21. Your answer:

  21. Convert 52°F to °C.

    22. Your answer:

  22. Name MgCl2. Spelling must be correct.

    23. Your answer:

  23. Name P2O5. Spelling must be correct; for this and similar questions use lower case letters.

    24. Your answer:

  24. Name H2SO4(aq). Spelling must be correct.

    25. Your answer:

  25. Name CaNH4PO4. Spelling must be correct.

    26. Your answer:

  26. Name F(1-). Spelling must be correct.

    27. Your answer:

  27. Name S. Spelling must be correct.

    28. Your answer:

  28. Name FeCl3. Spelling must be correct.

    29. Your answer:

  29. Write the formula for potassium hypochlorite.

    30. Your answer:

  30. Write the formula for dinitrogen trioxide.

    31. Your answer:

  31. Write the formula for hydrobromric acid.

    32. Your answer:

  32. Write the formula for calcium carbonate.

    33. Your answer:

  33. Write the formula for potassium chlorate.

    34. Your answer:

  34. Write the formula for magnesium nitrite.

    35. Your answer:

  35. Write the formula for tin (IV) oxide.

    36. Your answer:

  36. Calculate the molar mass of Ca3(PO4)2 to the nearest whole number. You must use a periodic table.

    37. Your answer:

  37. What mass of Na2CO3*10H2O must be dissolved and diluted to the mark in a 500-mL volumetric flask (500.00 mL) to prepare a 0.10M Na2CO3(aq) solution? You must use a periodic table. Report the answer to the correct number of significant figures.

    38. Your answer:

  38. Name Na2CO3*10H2O. Spelling must be correct.

    39. Your answer:

  39. Calculate the empirical formula of salicyclic acid with a mass composition of 60.87% C, 4.38% H, and 34.75% O. You may assume 100.00 grams of starting material and you must use a periodic table.

    40. Your answer:

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