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Materials Science > Final > Flashcards

Final Flashcards

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0
Q

True or False

The person who came out with the idea that atoms vibrate is Robert Brown and the concept is called Brownian motion

A

True

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1
Q

True or False

The concept of the atom is 100th and several thousandths of years old

A

True

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2
Q

True or false

The idea that matter is composed of atoms it goes back to the Greeks in the fifth century B.C

A

True

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3
Q

True or false

We know of 118 distinct atoms, called the chemical elements. Only 88 elements are found naturally

A

True

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4
Q

True or false

All materials burn at the same color?

A

True

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5
Q

True or false

Neil’s Bohr knew that when pure elements were excited by heat or electricity they gave off distinct colors

A

True e

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6
Q

Who came up with the concept that when an atom is excited, such as during heating, electrons can jump to higher levels. When the electrons fall back to lower energy levels, precise quarta wavelengths (lines) of light

A

Neil’s Bohr

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7
Q

True or false

In a atom the number of electrons equal the number of neutrons

A

False -protons

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8
Q

True or false

Aluminum is a solid?

A

False

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9
Q

True or false

Aluminum is an amorphous liquid?

A

True

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10
Q

True or false

The type of bond that is in a crystal is a coordinate covalent bond

A

True

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11
Q

True or false

The type of bond in a crystal is an ironic bond

A

False

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12
Q

True or false

Metals are generally a single element

A

False it is a mixture

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13
Q

True or false

Specific gravity is defined by weight it is density of material/ density of water

A

True

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14
Q

True or false

Density is often expressed as specific gravity, the ratio of the density of the material to the density of water

A

True

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15
Q

True or false

Every pure metal has a specific melting point

A

True

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16
Q

True or false

Melting point/ boiling point called coligative properties

A

True

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17
Q

True or false

Most alloys do not melt completely at a specific temperature

A

True

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18
Q

True or false
Melting starts when the material has reached a certain temperature, but is not completed until a somewhat higher temperature has been reached. This is a fact of great significance in the welding of steel.

A

True

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19
Q

True or false

The amount of heat required to raise a unit mass of solid metal one degree in temperature is termed specific heat.

A

True

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20
Q

How many calories do I have to add to 1cc of water to raise it to 1 centigrade

A

1

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21
Q

True or false

Silver is a better conductor of heat than aluminum

A

True

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22
Q

True or false

Silver is a better conductor of heat than steel

A

True

23
Q

True or false

The increase in dimensions on a solid body due to an increase in temperature is termed thermal expansion

A

True

24
Q

What material does not expand to heat?

A

Entimity contracts to heat

25
Q

True or false

By adding carbon to steel the temperature it freezes at is increased

A

True

26
Q

True or false

If you add a lot of carbon to steel the freezing temp drops

A

True

27
Q

True or false

The ability of the metal to resist pulling force, specifically, to what is termed its tensile strength

A

True

28
Q

True or false

yield strength/point is the permanent deformation and force is required to deform a material

A

True

29
Q

True or false

Fracture strength is force required to break an object per unit area?

A

True

30
Q

True or false

Ductility is how much a material is stretched out with 2 inches of length/ percentage of eleongation in 2”

A

True

31
Q

True or false

Hardness is usually defined as the ability of the metal to resist indentation or penetration by another material

A

True

32
Q

True or false
Compressive strength is the ability of a material to resist a gradually applied “push”, rather than “pull”, compressing and stressing or push or pull.

A

True

33
Q

True or false

Most of the steels have crystals called ferrite, pearlite, and cementite

A

True

34
Q

True or false
Steels in the lower part of the range seldom contain pearlite. The carbon usually winds up in particles of iron carbide (cementite) scattered grains of ferrite.

A

True

35
Q

True or false
Any steel which contains more than 1.65 % manganese or .60% copper! or a guaranteed minimum amount of any other metal is termed an alloy steel.

A

True

36
Q

True or false
The metals most frequently used for alloying purposes are nickel, chromium, molybdenum, vanadium, manganese, and stainless steel

A

True

37
Q

True or false
Steel annealed by heating to a temperature above the critical (733 degrees Celsius), so that all the iron will return to the face-centered form called austenite, and then allowing it to cool slowly through the transformation range. Makes it softer and malleable

A

True

38
Q

True or false

An intimate mixture of ferrite and cementite known as pearlite

A

True

39
Q

Does ferrite have oxygen in it?

A

Yes it’s iron oxide

40
Q

If I have a steel that is called a feretic steel what does it have in it?

A

Chromium with small amount of carbon

41
Q

What’s the difference between a ferritic steel and martensitic?

A

Martensitic are similar to ferritic steels in being based on chromium but have higher carbon levels up as 1%. This allows them to be hardened and tempered much like carbon and low -alloy steels

42
Q

True or false
Steel is tempered by heating it to a temperature below the transformation range and then allowing it to cool at a controlled rate.

A

True

43
Q

Can you weld cast iron?

A

Yes common cast iron cannot be welded but there are weld able cast irons

44
Q

True or false

The four digit steel numbers- the first two are alloys the last two is the percentage of carbon

A

True

45
Q

True or false

If a bolt has 3 lines on the top it is medium carbon Steel

A

True

46
Q

True or false

If the bolt is black it is high carbon steel

A

True

47
Q

True or false

If there is no lines on the top of the bolt it is low carbon steel

A

True

48
Q

True or false

10.9 is metric it’s medium carbon steel

A

True

49
Q

How do you make aluminum stronger?

A

Cole rolling

50
Q

True or false

Cast irons are good for drilling

A

True

51
Q

True or false

The first number of the aluminum tells the percentage of aluminum is 1 copper is 2 and manganese is 3

A

True w

52
Q

If you drill steel really fast what’s the danger?

A

The part where you are drilling the whole is soft which is not good

53
Q

True or false
Plastic material is any of a wide range of synthetic or semi synthetic organic solids that are moldable and are usually classified by their chemical structure of the polymers backbone and side chains.

A

True

54
Q

True or false

Thermoplastic doesn’t change chemical structure

A

True

55
Q

What is the difference polypropylene and nylon?

A

How do you get rid of heat?

56
Q

How to get rid of heat?

A

Radiation
Convection
Conduction
Evaporation

Materials Science (2 decks)

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