Chem #1

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Author:
dee3215
ID:
16857
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Chem #1
Updated:
2010-04-29 21:09:17
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elements
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Description:
Conversions, Si prefixes
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  1. Which of the following cannot be seperated into a simpler substance by chemical means?
    • A. Element
    • B. Emulsion
    • C. Compound
    • D. Homogenous mixture
    • E. Heterogenous mixture
  2. If a liquid contains 60% sugar and 40% water throughout its composition then what is it called?
    • A. Solute
    • B. Compound
    • C. Homogenous mixture
    • D. Heterogenous mixture
    • E. Solvent
  3. The SI prefixes milli and mega represent, respectively:
    • A. 10^6 and 10^-6
    • B. 10^-3 and 10^6
    • C. 10^3 and 10^-6
    • D. 10^-3 and 10^9
    • E. 10^-6 and 10^-3
  4. How many milliliters is 0.0055L?
    • A. 0.55mL
    • B. 5.5 mL
    • C. 0.55 mL
    • D. 0.0000055mL
    • E. 182 mL
  5. How many inches are in 382.5 cm? (1in=2.54cm)
    • A. 150.6 in
    • B. 6.641x10^-3 in
    • C. 151 in
    • D. 971.6 in
    • E. 972 in

    382.5 cm x 1in/2.54 cm=150.6
  6. What is the volume of a container that contains 14.3g of a substance having a density of 0.988 g/cm3?
    14.5 cm3

    14.3gx 1cm/.988g=14.5g/cm3
  7. if you have a graduated cylinder containing 15.5 mL and this volume changes to 95.2 mL after a metal with a mass of 7.95g is dropped into the graduated cylinder then what is the density of this metal?
    9.97x10^-2 g/mL
  8. Radio waves travel at the speed of light which is 3.00x10^8 m/s. How many minutes does it take for a radio message to reach earth from saturn if saturn is 7.9x10^8 km from earth?
    • 44 min
    • 7.9x10^8 km x 1sec/3x10^8 m
    • 3x10^8/1sec x 60sec/min x 1km/1000= 1.8x10^7 km/min

    1min/1.8x10^7 km x 7.9 x10^8/1min = 44min
  9. If the temperature is 38F then what is the temperature in Kelvin?
    276.5 K

    • 38-32/1.8 = 3.34 C
    • 3.34C + 273K= 276.5K
  10. Select the answer with the correct number of decimal places for the following sum:
    13.914 cm+ 243.1 cm + 12.00460 cm=
    269.0 cm
  11. Express 122F in C
    50.0 C

    122F-32/1.8=50C
  12. Convert 500 milliliters to quarts. (1L=1.06qt)
    0.528 qt

    500 mlx 1L/1000mlx 1.06 qt/1L = 0.52 qt
  13. After carrying out the operations below, how many significant figures are appropriate to show in the result?
    (13.7 + 0.027) / 8.221
    3 significant figures
  14. The speed needed to escape the pull of earth's gravity is 11.3 km/s.
    What is this speed in mi/h? (1mi=1609m)
    25,300 mi/h

    11.3km/1hr x 1000 m/1km x 1mile/1609m x 60 sec/min x 60 min/1hr-= 25,300mi/h
  15. The SI base unit of mass is
    Kilogram
  16. Acetone, which is used as a solvent and as a reactant in the manufacture of plexiglass boils at 56.1C
    What is the boiling point in degrees Farenheit?
    133F

    1.8 X 56.1 + 32= 133
  17. Which of the following is a chemical change?
    Broiling a steak on a grill
  18. The number 6.0448, rounded to 3 decimal places, becomes 6.045
    TRUE
  19. Matter is anything that has mass and occupies space
    TRUE
  20. When applying the scientific method, a model or theory should be based on experimental data.
    True
  21. The scientist who determined the magnitude of the electric charge of the electron was
    Robert Millkan
  22. Which of the following is a type of radioactive radiation which has no charge and are unaffected by external
    electric or magnetic fields?
    Y Rays
  23. Which of these scientists developed the nuclear model of the atom?
    Ernest Rutherford
  24. Which one of the following statements about atoms and subatomic particles is correct?
    A neutral atom contains equal numbers of protons and electrons
  25. Atoms of the same element with different mass numbers are called
    Isotopes
  26. How many neutrons are there in an atom of lead whose mass number is 208?
    126

    208-82=126
  27. Give the number of protons (p), electrons (e), and neutrons (n) in one atom of Chlorine-37
    17p, 17e, 20n
  28. A magnesium ion, Mg2+, has
    12 protons and 10 electrons
  29. An oxide ion, O^2-, has
    10 protons and 8 electrons
  30. The elements in a column of the periodic table are known as
    a group
  31. Which of the following is a non-metal?
    bromine, Br, Z=35
  32. Which of these elements is chemically similar to magnesium?
    Calcium
  33. Which of the following is the empirical formula for hexane, C6H14?
    C3H7
  34. The compound, P4S10, is used in the manufacture of safety matches. What is its name?
    Tetraphosphorus Decasulfide
  35. Tetrasulfur dinitride decomposes explosively when heated. What is it's formula?
    S4N2
  36. An anion is defined as
    A charged atom or group of atoms with a net negative charge.
  37. Which pair of elements would be most likely to form an ionic compound?
    F and Al
  38. What is the formula for the ionic compound formed by calcium ions and nitrate ions?
    Ca (NO3)2
  39. What is the formula for the ionic compound formed by calcium and selenium?
    CaSe
  40. The formula for magnesium sulfate is
    MgSO4
  41. Potassium permanganate is a strong oxidizer that reacts explosively with easily oxidized materials. What is it's formula?
    KMnO4
  42. What is the name of Mn(CO3)2?
    Maganese (IV) carbonate
  43. Iron (III) Chloride hexahydrate is used as a coagulant for sewage and industrial wastes. What is it's formula?
    FeCl3 6H2O
  44. Which of the follwoing are allotropes?
    diamond and graphite
  45. Which of these elements is chemically similar to potassium?
    Cesium
  46. What is the correct name for ClO3-
    Chlorate Ion
  47. A compound with an -OH functional group is called
    Alcohol
  48. An alkane with eight carbons would be called
    Octane
  49. How many hydrogen atoms are in the propane compound?
    8

    C3H8
  50. What is the formula for Aluminum Oxide?
    Al2 O3

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