2. Another name for a homogeneous mixture is
     a.  substance.         b.  element.         c.  compound.         d.  solution.

  3. Which of the following can be classified as an ionic compound?
     a.  CaO(s)         b.  Cu(s)         c.  N₂O(g)         d.  C₇H₆O₂(s)

  4. Which of the following is not a physical change?
     a.  Fe(l) ----> Fe(s) + Heat                        b.  2 H₂(g) + O₂(g) ---> 2 H₂0(l) + Heat
     c.  H₂0(l) + Heat ---> H₂0(g)                     d.  CO₂(s) + Heat ---> CO₂(l)

  5. Convert 7.25 x 10^-4 g to ng.
     a.  7.25 x 10^-13 ng             b.  7.25 x 10^-9 ng             c.  7.25 x 10⁵ ng             d.  7.25 x 10³ ng

  6. Which is the largest measurement?
     a.  1.26 x 10^-2 dm.             b.  1.26 x 10^-9 Mm.             c.  1.26 x 10⁹ pm.             d.  1.26 x 10¹ mm.

  7. Convert 3.00 x 10² cm³ to mm³.
     a.  3.00 x 10³             b.  3.00 x 10^-3             c.  3.00 x 10⁵             d.  3.00 x 10³

  8. Convert the 20.00 miles per hour to km/s.
     a.  4.475 x 10⁴ km/s         b.  7.810 x 10¹⁵ km/s         c.  2.220 x 10⁶ km/s d.  8.939 x 10^-3 km/s

  9. A 50.0 mL sample of a liquid has a mass of 156.0 g.  What is the density?
     a.  7.80 x 10³ g/mL             b.  3.12 g/mL             c.  4.33 g/mL             d.  3.21 x 10^-1 g/mL

 10. A rectangular block of metal measures 3.00 cm x 1.25 cm x 1.50 cm and has a mass of
       50.175 g. What is the identity of the metal?
     a.  Gold  (density = 19.3 g/mL)                     b.  Silver  (density = 10.5 g/mL)
     c.  Copper  (density = 8.92 g/mL)                d.  Platinum  (density = 21.45 g/mL)

 11. Which of the following occupies the largest volume?
     a.  100 g of iron         b.  100 g of lead         c.  100 g of water         d.  100 g of ice

 12. In a reaction, a chemist determined that 4.012 g of mercury reacts with 0.3200 g of oxygen
       to form a solid oxide of mercury.  How much mercury is required to form 2.000 g of the
       solid oxide of mercury?
     a.  1.852 g         b.  2.331 g         c.  0.111 g         d.  8.972 g

 13. How many electrons are in an atom of silicon?
     a.  16         b.  14         c.  28         d.  42

 14. Which of the following contains the largest number of neutrons?
     a.  ⁵⁷Fe         b.  ⁵⁹Co         c.  ⁶⁴Ni         d.  ⁶⁸Cu

 15. Which of the following pairs have equal number of electrons?
     a.  N^3- and F         b.  K and S^2-         c.  Ar and S^2-         d.  Ca²⁺ and S^1-

 16. A MOLECULAR compound is most likely to be formed between
     a.  magnesium and oxygen.         b.  sodium and sulfur.
     c.  zinc and cobalt.                    d.  fluorine and oxygen.

 17. Which of the following is not a stable ion?
     a.  Na²⁺         b.  Mg²⁺         c.  S^2-         d.  N^3-

 18. Which of the following contains more electrons than protons?
     a.  Na         b.  Na¹⁺         c.  Cl^1-         d.  Ca¹⁺

 19. Which equation indicates a nonmetal reacting with a halogen?
     a.  Si + 2 Cl₂ --->   SiCl₄             b.  3 F₂ + 2 Al ---> 2 AlF₃
     c.  2 H₂ +  C --->  CH₄               d.  2 Br₂ + C --->  CBr₄

 20. Which of the following elements is a metalloid?
     a.  Arsenic         b.  Cobalt         c.  Zinc         d.  Bromine

 21. Which of the following is FALSE?
     a.  Barium is an alkaline earth metal.         b.  Carbon is a metalloid.
     c.  Elemental fluorine is diatomic.              d.  Pb is a metal.

 22. Which statement is TRUE?
     a.  Elements in the same PERIOD are similar physically and chemically.
     b.  Group 2 contains 2 elements.
     c.  Group 17 are referred to as the halogens.
     d.  There are 7 elements which exist as diatomic gases at room temperature and atmospheric pressure.

 23. Which element is in the second period and group 13 of the periodic table?
     a.  Boron         b.  Beryllium         c.  Iodine         d.  Aluminum