CHAPTER 16

Question 1

the naturally occurring metallic compounds are called

Answer 1

minerals

Question 2

a solid deposit containing a sufficiently high percentage of minerals to make extraction of metals economically feasible

Answer 2

ores

Question 3

the process of separating a metal from its ore is called

Answer 3

metallurgy

Question 4

what are the main steps of metallurgy?

Answer 4

1. crushing, grinding, or pulverizing of the ore.
2. concentration of the ore
3. extraction of metal
4. refining of metal

Question 5

what method is used when large density differences exist between the ore and its impurities?

Answer 5

a cyclone separator is used. in this, air under high pressure is blown through the pulverized ore.

Question 6

the copper ore is concentrated by which physical method?

Answer 6

flotation process

Question 7

the method to reduce metal ions to free metal is called

Answer 7

smelting

Question 8

what are the reactions of a roasted copper ore heated with coke and sand at 1100C

Answer 8

2FeS plus O2 = 2FeO plus 2SO2
FeO plus SiO2 = FeSiO3

Question 9

the bottom layer of roasted copper ore after heated with coke and sand consists of

Answer 9

a mixture of Cu2S and FeS called matte

Question 10

the top layer of roasted copper ore after being heated with coke and sand consists of

Answer 10

reaction of FeO and Sand

Question 11

what are the physical methods of concentration of ore

Answer 11

1. Magnetic separation
2. Cyclone Separation
3. Flotation Process

Question 12

what are the raw materials used in the solvay process

Answer 12

1. Ammonia
2. Brine
3. Lime stone as a source pf co2 and slaked lime Ca(OH)2