C4.6 Metals – LearnITbyTests

1. Describe the chemical properties of sodium metal when left in the atmosphere

When left in dry air it forms Sodium oxide. 4Na9S) + O2 (g) = 2Na2O (S).

In moist air it forms Sodium hydroxide and Hydrogen gas. 2Na(S) + 2H2O(l) = 2NaoH(aq) + H2(g).

When heated in air sodium readily burn with a yellow flame to form Sodium peroxide. 2Na(S) + O2(g) = Na2O2(S)

All of the above

2. Describe the commercial extraction of Aluminum metal

It is extracted from the chief ore Bauxite

The major compound in the chief ore is Hydrated Aluminum oxide Al2O3.2H2O

It is extracted from the electrolysis of Aluminum oxide in molten cryolite

All of the above

3. Name the chief ore of Sodium metal

Bauxite

Rock salt

Zinc Blende

Hematite

4. Mention the effects of metals on the environment

Mining of ores from the ground leads to gapping earth holes if not refilled.

The gaseous by-products such as chlorine gas and Sulphur (IV) oxide in the roasting of ores lead to acidic rain and air pollution

Solid by-products such as slag could lead to land pollution if not disposed of safely

All of the above

5. Describe the commercial extraction of Iron

It is extracted from the main ore Hematite.

The main constituent compound in the ore is Iron (III) oxide Fe2O3.

It is extracted from the reduction of Iron (III) oxide by carbon (II) oxide

All of the above

6. How do metals react with cold water and steam?

Only steam reacts with cold water to form Sodium hydroxide and hydrogen gas

Aluminum, Zinc and Iron react with steam and not cold water to form metal oxides and hydrogen gas.

Copper doesn’t react with steam at all.

All of the above

7. What occurs before the extraction process of a chief ore?

Qualitative analysis to determine the metal present

Quantitative analysis to determine the quantity of metal present

the method of extraction of a metal which depends on the metal’s reactivity

All of the above

8. Name the chief ore of Zinc

Bauxite

Rock salt

zinc Blende

Hematite

9. Mention the common metal ores

Oxides and Sulphides

Carbonates

Chlorides

All of the above

10. Describe the commercial extraction of Copper metal

It is extracted from the main ore Copper pyrites

The main constituent compound in the ore is Copper (II) sulphide, CuFeS2

It is extracted from heating copper sulphide in the regulated supply of air to form copper (II) oxides and Reduction of copper (II) oxides by the copper sulphide

All of the above

11. Mention the uses of Zinc

Zinc is used to galvanize iron to prevent it from rusting

To make brass, an alloy of copper and zinc.

Making of outer casing in dry batteries.

All of the above

12. Mention the uses of Aluminum

Used to make cooking vessels such as sufurias because it is a good conductor of heat and corrosive resistant

For making overhead cables because it is light and is a good conductor of electricity

Used as a reducing agent in the extraction of some metals such as Chromium iron

All of the above

13. What results in the difference in density in metals?

The difference in atomic masses

Packing of the atoms in the metallic lattice

Size of the atoms

All of the above

14. Describe the commercial extraction of sodium metal

It is extracted from the chief ore Rock salt.

The major compound in the chief ore is Sodium Chloride {NaCl}

It is extracted from the electrolysis process of molten sodium chloride

All of the above

15. Mention the uses of sodium

Sodium cyanide is used in the extraction of gold.

Sodium vapor is used in the street lamps which give yellow-orange light.

Sodium hydroxide a compound of Sodium is used in the manufacture of detergents

All of the above

16. Name the chief ore of Aluminum

Bauxite

Rock salt

Zinc Blende

Hematite

17. What results in the difference in electrical conductivity in metals?

The number of delocalized electrons in various metals.

The ease of movement of delocalized electrons within the lattice (structure).

The amount of voltage and current supply

Both A and B

18. Mention the uses of copper metal

Making soldering instruments due to its high thermal conductivity

Making coins and ornaments.

Making electrical wires and contacts in switches, plugs and sockets

All of the above

19. Describe the commercial extraction of Zinc metal

It is extracted from the main ore Zinc blende

The main constituent compound in the ore is Zinc Sulphide ZnS

It is extracted from the roasting in the air followed by the reduction of Zinc oxide by carbon

All of the above

20. Name the chief ore of copper

Galena

Bauxite

Copper pyrites

Hematite

21. Mention the steps of concentrating an ore before undergoing the purification process

Removing any magnetic materials with a magnet

Dissolving the mineral in a suitable solvent

Washing it with water to remove earthy matter and froth flotation

All of the above

22. How do the most reactive metals such as Sodium get extracted?

By electrolysis

By reduction of their oxides using suitable reducing agents

By Froth floating

None of the mentioned

23. How do the most reactive metals such as Sodium get extracted?

By electrolysis

By reduction of their oxides using suitable reducing agents

By Froth floating

None of the mentioned

24. An ore from which a metal can be obtained on a commercial scale is referred to as

Iron ore

Common ore

Chief ore

None of the mentioned

25. Name the chief ore of iron

Magnetite

Siderite

Pyrite

Hematite

26. How do metals react with chlorine?

Metal react with chlorine to form Metal chloride. Fe(S) + Cl(g) = 2FeCl3(S

The metal chloride when exposed to the atmosphere it hydrolyzed by water vapor o produce hydrogen chloride gas. FeCl3(S) + 3H2O(l) = Fe(OH)3(S) + 3HCl(g)

Both A and B

None of the mentioned

27. A given metal may have several ores in its example, Hematite (Fe2O3), Magnetite (Fe3O4), siderite (FeCO3) and iron pyrites (FeS2) are all iron ores. True of False

FALSE

Maybe

TRUE

None of the mentioned

28. Describe the commercial extraction of Copper

It is extracted from the main ore Malachite

The main constituent compound in the ore is basic copper (II) carbonate CuCO3.Cu (OH) 2

It is extracted from heating in the air followed by the reduction of carbon

All of the above

29. Mention the physical properties of metals

Metals have high melting and boiling points due to the strong metallic bond.

Metals are good conductors of electricity and heat due to the presence of delocalized electrons

Metals can be pressed into sheets (malleability) and drawn into wires (ductility)

All of the above

30. Mention the Uses of Iron

Cast iron is extremely hard and is used in making engine cylinder blocks, gates and drainage pipe

Mild steel is used in making nails, car bodies, ship bodies and pipes

Stainless steel is used cutlery, sinks and vats.

All of the above

31. Name the chief ore of Lead

Galena

Bauxite

Copper pyrites

Hematite

32. What is the name of purifying a metal by grounding into a fine powder then mixing it with water containing special oils such as pine oils?

Concentration

Extraction

Forth floating

None of the mentioned

33. Some metals occur naturally in a free uncombined state while others are found combined while others as elements. True or False

TRUE

FALSE

Maybe

None

34. How do metals react with acids?

It reacts with acids to form salts and hydrogen gas

Aluminum and Zinc react with hot concentrated Sulphuric acid to give out Salts + water + SO2 (g).

Copper doesn’t react with dilute hydrochloric acid, dilute sulphuric acid or dilute nitric acid but it reacts with concentrated Nitric acid to form salt + water + nitrogen (IV) oxide. NO2(g).

All of the above

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