Metals

Question 1

Any substance characterized by high electrical and thermal conductivity, as well as malleability, ductility, and high reflectivity

Answer 1

Metal

Question 2

A mineral rich rock mined for its minerals

Answer 2

Ore

Question 3

What are the physical properties of metal?

Answer 3

• Strong and hard
• Luster (shiny)
• Heat conductor
• Electic conductor
• Dense

Question 4

What are the mechanical properties of metal?

Answer 4

• Hardness (ability to resist permanent distortion)
• Brittleness (bending without shattering)
• Malleability (ability to be hammered)
• Ductility (to be permanently bent)
• Elasticity (to return to its original shape)
• Fusibility (can be welded)

Question 5

When metal reacts with oxygen in water and air

Answer 5

Oxidation

Question 6

What are the 2 classifications of metals?

Answer 6

Ferrous and Non Ferrous

Question 7

Which classification of metal contains iron and is magnetic?

Answer 7

Ferrous

Question 8

Which classification of metal does not contain iron and isn’t magnetic?

Answer 8

Non Ferrous

Question 9

What is the difference between Ferrous and non ferrous metals in terms of corrosion?

Answer 9

Non ferrous metals give more resistance to corrosion compared to ferrous metals

Question 10

The most abundant metal on Earth and makes up its outer and inner core

Answer 10

Iron

Question 11

The intermediate product of smelting iron/molten iron from the furnace where impurities are removed. It is commonly used in cast iron, wrought iron, columns, door brackets, etc.

Answer 11

Pig iron

Question 12

What are the characteristics of pig iron?

Answer 12

• Can hardened but not tempered
• Can be magnetized
• Does not rust
• Cannot be welded

Question 13

A by-product of pig iron. It is melted until it is molten iron and poured into a mold

Answer 13

Cast iron

Question 14

The after product of pig iron/basic form of iron alloy with low carbon content. It is also the most common form of iron.

Answer 14

Wrought iron

Question 15

Iron with zinc coating to prevent corrosion, commonly used for plumbing/hardware that is always exposed to the elements

Answer 15

Galvanized iron

Question 16

An alloy(combination of 2 or more elements/metals) of iron and carbon. It is smelted iron that has been reheated and can contain copper, bronze, or tin.

Answer 16

Steel

Question 17

A kind of steel alloy with carbon, manganese, phosphorus, sulfur, and silicon

Answer 17

Carbon Steel

Question 18

A steel alloy with chromium, nickel, molybdenum, and manganese. It is known for not rusting/staining as ordinary steel

Answer 18

Stainless steel

Question 19

A kind of stainless steel finish that is unreflective and smooth

Answer 19

Matte-finish

Question 20

A very-strong, low alloy steel that has an oxide coating when exposed to moisture

Answer 20

Weathering steel (also known as Cor-ten steel)

Question 21

A low carbon steel (<.15%) that is tougher and more elastic but brittle and less ductile. They are extensively used in reinforcing prestressed concrete structures

Answer 21

High Tension steel

Question 22

It is the steel commonly seen embedded as reinforcement in concrete to make it stronger in tension

Answer 22

Reinforcing steel

Question 23

A silvery-white (non ferrous) metal that is corrosion resistant, soft, lightweight, fireproof/heat resistant, among other things

Answer 23

Aluminium

Question 24

A pure metal that is reddish-orange in color and can be combined with Tin to form Bronze

Answer 24

Copper

Question 25

A metal alloy made of Copper and Zinc that is extremely malleable and has a low melting point. 90% of these alloys are recycled because it is not ferromagnetic (does not retain its magnetism)

Answer 25

Brass

Question 26

Brass is used for decoration for its _________ appearance and ______ friction (e.g. locks, gears, door knobs, ammunition casings)

Answer 26

Bright gold ; low friction

Question 27

A bluish-white lustrous metal that tarnishes quickly

Answer 27

Zinc

Question 28

What is rusting?

Answer 28

Oxidation of iron at the surface by he presence of moisture and carbon dioxide

Question 29

What is corrosion?

Answer 29

It is the slow but steady eating away of metal as a consequence of rusting

Question 30

What are the 3 ways to join metals?

Answer 30

- Soldering - Brazing - Welding

Question 31

What are the 2 types of welding?

Answer 31

- Pressure welding (surfaces are heated then pressure is applied to join them) - Fusion welding (surfaces are brought near each other, then heated by gas/electric spark until it melts)

Question 32

It is the method of joining 2 metals using low metal alloy (solder melts) to adhere the surface and fill up the joint

Answer 32

Soldering

Question 33

Joining metals similarly to soldering but at a higher temperature (650-1100c) using a mixture of Tin, Zinc, and Copper.

Answer 33

Brazing