Test Chapter 2.D

CHEMCOM
TEST CHAPTER 2.D

1) In general a ____________reactive metal will release a ___________
reactive metal from and ore
a) more;less b) less; more

2) An ore contains lead in the form PbS. Placing the ore in mercury will remove the ore
a) true b) false

3) A naturally occurring compound that contains a metal is called a(n)
a) mineral b) ore
c) deposit d) concentrate

4) Early people removed iron from iron ore by heating it in a fire with carbon and no air. This was an early form of
a) amalgamation b) electrometallurgy
c) hydrometallurgy d) pyrometallurgy

5) Metals with high chemical activity are found _______in nature
a) free b) combined c) both

6) A rock which contains metal that can be removed at a profit is called a(n)
a) mineral b) ore
c) deposit d) concentrate

7) Zinc is placed in a solution of silver nitrate. A reaction takes places
and silver is removed from the silver nitrate. This method of removing metals is called
a) amalgamation b) electrometallurgy
c) hydrometallurgy d) pyrometallurgy

8) The following reaction is called a __________ reaction
Ag----------> 1e- + Ag+1
a.) oxidation b.) reduction c.) redox
d.) synthesis

9) The gaining of e- by an ion to become a neutral atom is called
a.) oxidation b.) reduction c.) redox
d.) synthesis

10) Which property of ceramics makes it most difficult to use it as a replacement for steel
a.) melting point b.) low activity c.) brittleness
d.) high temperature strength

11) In the following reaction which substance has been reduced
NaCl + K ------> KCl + Na
a.) Na b.) Cl c.) K d.) KCl

12) There are two methods of heating minerals to get metal. The main difference between the 2 is
a.) temperature b.) whether oxygen is present
c.) the cost of the process d.) the % of metal removed

13) In our lab in which CuCO3 was used to obtain metallic copper, the method of reduction is called
a) amalgamation b) electrometallurgy
c) hydrometallurgy d) pyrometallurgy

14) When copper is recycled it is reusable after it has been
a.) reduced by pyrometallurgy b.) separated from waste rock
c.) washed and cleaned d.) heated and melted down into ingots

15) A anode is an electrode
a.)that has a positive charge b.) where reduction happens
c.) that releases e- d.) that has a negative charge

16) Metals are usually obtained from an ore by a process called
a) melting b) casting c) oxidation d) reduction

17) Which fact about reduction is true
a) It is the process by which metals are removed from ore
b) It involves the loss of electrons
c) It changes metals into ions
d) It causes metals to change to nonmetals

18) Fe2O3 is a source of Fe According to formula, how many moles of Fe are found in 1 mole of Fe2O3?
a) 1 b) 2 c) 3 d) 4 e) 5

19) What is the % of carbon in CO2?
a) 12% b) 24% c) 27% d) 34% e) none of these

20) Gold rings are made of a mixture(not a compound) of gold and copper.
A ring which 1.25 ounces is melted down and is found to contain .90 ounces of gold. What is the % of gold in the ring?
a) 28% b) 32% c) 50% d) 72% e) none of these

21) What is the value of the gold in the ring if gold sells for $408/ounce
a) $130.56 b) $293.76 c) $367.20 d) $510 e) none of these

22) Why did early humans first use gold, silver and copper rather than other metals
a) they were more abundant
b) they are unreactive and found free in nature
c) they are found near the surface rather than deep in the earth
d) the high value of the metal made them desirable for trading

23) A piece of Mg metal is placed in 3 solutions: copper nitrate, zinc nitrate, and silver nitrate. A reaction takes place in each. What conclusion can be made from this observation.
a) Nitrate is more active than the metals
b) Mg is more active than the other metals
c) Mg is less active than the other metals
d) Mg is the most active and silver is the least active
e) none of these

24) A strip of silver is placed in a solution of copper sulfate. What will happen
a) The silver reacts b) Copper is released
c) both a and b d) The silver combines with the copper e) Nothing

25) The value of a metal from ore is effected by
a) the law of supply and demand
b) the amount of ore which available
c) the % of metal in the ore
d) the method used to remove the metal
e) all of these

Essays

Copper begins as resource found in the earth. List the steps needed to take this resource and make it useful(the copper cycle)
EXPLAIN EACH STEP IN A COUPLE OF SENTENCES. Include recycled copper

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2.)

A solution of water and copper chloride, CuCl2, is made. It is placed in a U tube. Two electrodes as placed in the tube and electricity is passed thru the solution. After a few minutes one electrode is coated with a silver substances and the other has produced a yellow, pungent gas

a) Which electrode collected the copper_____________(+ or -)
b) Which substance was collected at the anode? ______________
c) Check which reaction describes the Zinc
____ Cu+2 + 2e- ------> Cu or
____ Cu ------> Cu+2 + 2e-
____ Cu+2 ------> Cu + 2e-

d) Check which reaction describes the oxygen
____ 2 Cl-1 + 2e- ------> Cl2 or
____ Cl2 ------> 2 Cl+1 + 2e-
____ Cl-2 ------> Cl + 2e-

e) Which element is reduced___________? oxidized________?

f) Write the reaction that took place in the U tube

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a) How are metals removed from minerals in hydrometallurgy

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b) A mine has zinc ore which contains the mineral, ZnS. Name one metal from the list of metals(see last page) that could be used to remove the zinc using hydrometallurgy_________ Identify one metal that will not remove it ________

c) What property determines if a metal will remove another in hydrometallurgy
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d) Complete and balance the next 2 reactions( use the charts at the end for help)

____AlCl3 + _____Zn ---------> ___________ + ____________

____Ag2S + ______Zn --------> ____________ + ___________

Which mineral FeCO3 or Fe2MgPO4 has a great % of iron? SHOW WORK

A piece of ore has a mass of 567 grams. 7% of it is the mineral dolomite
CaMg(CO3)2. SHOW WORK

a) what is the % of Ca in dolomite?

b) How much dolomite is in the ore?

c) How many grams of Ca are in the ore

d) What is the % of Ca in the ore

Questions? Comments?
Jack O'Donnell

CHEMCOM TEST CHAPTER 2.D

CHEMCOM
TEST CHAPTER 2.D