Sample First Nine Weeks Exam


  1. What is the approximate weight of 8 liters of sulfur dioxide (SO2)?
  2. Find the number of molecules in 5 ml. of oxygen gas (O2)?
  3. Determine the number of molecules in 3 grams of carbon dioxide (CO2)?
  4. How many grams of potassium chlorate (KClO3) is needed to produce 16 grams of oxygen gas (O2) in the following equation? 2KClO3 2KCl + 3O2
  5. What is the percentage of oxygen in potassium chlorate?
  6. What is the electron configuration of selenium (Se)?
  7. Convert 77o Fahrenheit to degrees Celsius.

MULTIPLE GUESS

  1. ____ The number of orbitals in the L shell of an atom is a) 4 b) 1 c) 3 d) 2
  2. ____ The valence electrons of the atom are the electrons found in the a) nucleus b) incomplete inner shell c) lower left corner of the periodic table d) incomplete outer shell
  3. ____ The valence of a single atom of chlorine is a) 0 b) 1 c) 17 d) 7
  4. ____ Subtracting the number of protons from the number of electrons gives the number of a) neutrons b) electrons c) neither of these d) both of these
  5. ____ An atom or group of atoms with an unbalanced electrostatic charge is a) neutral b) a radical c) an ion d) covalent
  6. ____ The total number of atoms of oxygen represented in the expression 2Al2(SO4)3 is a) 17 b) 12 c) 24 d) 19
  7. ____ Lead weighs 11.34 grams per milliliter. This statement represents leads a) m.w. b) specific heat c) mass d) density
  8. ____ One kilogram is approximately equal to a) 2.2 pounds b) 454 grams c) 1000 milliliters d) 39.37 inches
  9. ____ All of the following are chemical changes except the a) souring of milk b) rusting of iron c) solution of sugar and water d) tarnishing of silver
  10. ____ The formula for chromic acid is H2CrO4. The oxidation number of the chromate ion (CrO4) is a) +2 b) -2 c)+4 d) -4
  11. ____ An element that is in group VII A of the periodic table usually has a valence number of a) +1 b) -1 c) +7 d) -7
  12. ____ The formula weight of potassium sulfate (K2SO4) is a) 87 b) 158 c) 174 d) 270
  13. ____ In the expression 4Fe(OH)3, the subscript of iron (Fe) is a) 1 b) 2 c) 3 d) 4
  14. ____ In the equation Zn + 2HCl ZnCl2 + H2, the equation weight of hydrochloric acid is a) 98.8 grams b) 36.5 grams c) 65.3 grams d) 73 grams
  15. ____ In the above equation the formula weight for hydrochloric acid is a) 98.8 grams b) 36.5 grams c) 65.3 grams d) 73 grams
  16. ____ The gram-equivalent weight of phosphoric acid (H3PO4) is a) 98 b) 49 c) 33 d) 3
  17. ____ Of the following, the only fundamental unit is a) force b) specific heat c) length d) speed
  18. ____ A weight of 45.4 grams is the same as a) 4540 milligrams b) 1 pound c) 0.0454 kilograms d) 32 ounces
  19. ____ The density of a solid is usually expressed in a) grams per millimeter b) weight per liter c) cubic centimeter per kilogram d) grams per milliliter
  20. ____ Subtracting the atomic number from the atomic mass of a given atom gives the number of a) protons b) protons plus neutrons c) electrons d) neutrons
  21. ____ Which of the following is equivalent to 10 millimeters? a) meter b) kilometer c) centimeter d) decimeter
  22. ____ A milliliter is equivalent to a) a quart b) 1000 liters c) 100 liters d) 1/1000 liter
  23. ____ Which of the following is a unit of heat energy? a) degree b) kilogram c) calorie d) celsius
  24. ____ If 1000 calories of heat are produced when 25 grams of a liquid at 5oC is raised to 85oC, the value of the specific heat of the liquid is a) 0.50 b) 1.00 c) 12.5 d) 40
  25. ____ On a trip to the moon, an astronaut's mass will a) increase b) decrease c) remain the same d) first decrease, then increase
  26. ____ Two units of measurement are required to express a) time b) length c) velocity d) mass
  27. ____ The density of sulfuric acid is 1.84 g/ml. The volume of 736 grams of this acid is a) 200 ml b) 400 ml c) 368 ml d) 736 ml
  28. ____ The volume of a piece of wood 6 cm X 4 cm X 1 cm is a) 24 cm b) 24 cm2 c) 24 cm3 d) 11 cm
  29. ____ What is the maximum number of electrons that may be found in the "d" sub-orbital of any atom? a) 2 b) 6 c) 10 d) 14
  30. ____ What is the maximum number of electrons that may be found in the "M" energy level of any atom? a) 2 b) 8 c) 18 d) 32

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