Chapter 4 - metals

Question 1

Write a list of the properties of a typical transition metal.

Answer 1

Good conductor of heat and electricity
Strong
Malleable
High melting point

Question 2

Where in the periodic table will you find the transition metals?

Answer 2

The central block

Question 3

Which metal out of the following is not a transition metal?

1. Copper
2. Aluminum
3. Gold

Answer 3

Aluminum

Question 4

Why is copper used so much in plumbing?

Answer 4

Its unreactive and malleable

Question 5

Why is gold alloyed with copper in many wedding rings?

Answer 5

To make it stronger and cheaper

Question 6

Silver and gold are good conducters of electricity. Why is copper used in wires instead of these metals?

Answer 6

Copper is cheaper than Silver and gold

Question 7

Why are aluminum alloys used extensively in the aircraft industry?

Answer 7

Aluminum is light-weight

Question 8

Why are copper alloys more suitable for making coins than pure copper

Answer 8

In alloying copper, differently sized atoms of other metals are introduced to the regular layers of copper atoms, disorting the layers and making it more difficult for them to slide over each other.

Question 9

How can iron be obtained from its ores?

Answer 9

Through reduction. Since iron is found in iron oxide, iron can be extracted using carbon, producing carbon dioxide.

This is done in blast furncaces.

Question 10

Iron ore

Answer 10

Haemetite.

Question 11

Why is iron obtained from the blast furnace brittle?

Answer 11

The iron obtained from the blast furnace is 96% iron and the rest is carbon. The carbon makes it brittle

Question 12

How does cast iron differ from pure iron in its compostion and properties?

Answer 12

Cast iron is made up of 4% carbon while pure iron is just made up of iron. Cast iron is brittle and relatively stronger than pure iron.

Question 13

Name the raw material used in blast furnace for extraction of iron

Answer 13

Haematite
Air
Coke
Limestone

Question 14

Name the main reducing agent in the blast furnace and write a balanced symbol equation for this formation.

Answer 14

Carbon monoxide

Co2 + O -> 2CO2

Question 15

A small amout of iron oxide is reduced by solid carbon. Write a balanced symbol equation for its reaction.

Answer 15

iron(iii)oxide + carbon -> iron + carbon dioxide

Question 16

Why does carbon monodioxide, as opposed to solid carbon, reduce most iron oxide?

Answer 16

As a gas carbon monoxide can diffuse throughout the blast furnace, and come in contact with more iron oxide