Which of the following minerals is a sulfide

1
Which of the following minerals is a sulfide?

• beryl
• chalcopyrite
• dolomite
• rock salt
• magnetite

2
Which one of the following ores is not a sulfide
ore?

• chalcopyrite
• chalcocite
• galena
• dolomite
• cinnabar

3
Which of the following statements about natural
sources of the elements is incorrect?

• Helium is obtained from wells in the United
  States and Russia.
• Halide salts of many of group IA elements are
  found in oceans, salt lakes, and brine wells.
• Most noble gases (other than helium) are obtained
  from air.
• Gold, platinum, and palladium are found as
  uncombined native ores.
• Nitrogen and oxygen are obtained from water.

4
Extraction of metals from one of the following
classes of ores is difficult and expensive. Which
class?

• oxide ores
• sulfide ores
• halide ores
• carbonate ores
• silicate ores

5
Heating of what mass of a sample containing 65.0
of Mg(OH)2 would produce 134.8 g of MgO? Assume
complete reaction and no other source of
magnesium.

• 300 g
• 123,4 g
• 67.4 g
• 104 g
• 150 g

6
Consider the roasting of 10.0 tons of sphalerite
which is 60.0 ZnS. Assume that all the ZnS is
converted to ZnO, and no other sulfur sources are
present. How many tons of SO2 are produced?

• 2.36 tons
• 3.94 tons
• 5.34 tons
• 6.00 tons
• 6.57 tons

7
What mass of Cl2 would be produced by the
electrolysis of 219 grams of molten NaCl?

• 66.4 g
• 200. g
• 100. g
• 133 g
• 266 g

8
What mass of chlorine would be produced by the
complete electrolysis of a sample of molten CaCl2
if the process produced 56.9 g of Ca?

• 39.7 g
• 167 g
• 49.8 g
• 25.8 g
• 101 g

9
What mass of hematite ore that is 76.0
Fe2O3contains 95 g of Fe? Assume no other form of
Fe is present.

• 89.3 g
• 178.6 g
• 201.4 g
• 42.5 g
• 95 g

10
What mass of Cu would be present in 36.0 g of
pure malachite, CuCO3 Cu(OH)2?

• 20.7 g
• 18.1 g
• 12.2 g
• 23.2 g
• 13.9 g