Final

Question 0

True or False

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

Answer 0

True

Question 1

True or False

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

Answer 1

True

Question 2

True or false

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

Answer 2

True

Question 3

True or false

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

Answer 3

True

Question 4

True or false

All materials burn at the same color?

Answer 4

True

Question 5

True or false

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

Answer 5

True e

Question 6

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

Answer 6

Neil’s Bohr

Question 7

True or false

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

Answer 7

False -protons

Question 8

True or false

Aluminum is a solid?

Answer 8

False

Question 9

True or false

Aluminum is an amorphous liquid?

Answer 9

True

Question 10

True or false

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

Answer 10

True

Question 11

True or false

The type of bond in a crystal is an ironic bond

Answer 11

False

Question 12

True or false

Metals are generally a single element

Answer 12

False it is a mixture

Question 13

True or false

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

Answer 13

True

Question 14

True or false

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

Answer 14

True

Question 15

True or false

Every pure metal has a specific melting point

Answer 15

True

Question 16

True or false

Melting point/ boiling point called coligative properties

Answer 16

True

Question 17

True or false

Most alloys do not melt completely at a specific temperature

Answer 17

True

Question 18

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.

Answer 18

True

Question 19

True or false

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

Answer 19

True

Question 20

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

Answer 20

1

Question 21

True or false

Silver is a better conductor of heat than aluminum

Answer 21

True

Question 22

True or false

Silver is a better conductor of heat than steel

Answer 22

True

Question 23

True or false

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

Answer 23

True

Question 24

What material does not expand to heat?

Answer 24

Entimity contracts to heat

Question 25

True or false | By adding carbon to steel the temperature it freezes at is increased

Answer 25

True

Question 26

True or false | If you add a lot of carbon to steel the freezing temp drops

Answer 26

True

Question 27

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

Answer 27

True

Question 28

True or false | yield strength/point is the permanent deformation and force is required to deform a material

Answer 28

True

Question 29

True or false | Fracture strength is force required to break an object per unit area?

Answer 29

True

Question 30

True or false | Ductility is how much a material is stretched out with 2 inches of length/ percentage of eleongation in 2"

Answer 30

True

Question 31

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

Answer 31

True

Question 32

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.

Answer 32

True

Question 33

True or false | Most of the steels have crystals called ferrite, pearlite, and cementite

Answer 33

True

Question 34

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.

Answer 34

True

Question 35

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.

Answer 35

True

Question 36

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

Answer 36

True

Question 37

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

Answer 37

True

Question 38

True or false | An intimate mixture of ferrite and cementite known as pearlite

Answer 38

True

Question 39

Does ferrite have oxygen in it?

Answer 39

Yes it's iron oxide

Question 40

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

Answer 40

Chromium with small amount of carbon

Question 41

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

Answer 41

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

Question 42

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.

Answer 42

True

Question 43

Can you weld cast iron?

Answer 43

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

Question 44

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

Answer 44

True

Question 45

True or false | If a bolt has 3 lines on the top it is medium carbon Steel

Answer 45

True

Question 46

True or false | If the bolt is black it is high carbon steel

Answer 46

True

Question 47

True or false | If there is no lines on the top of the bolt it is low carbon steel

Answer 47

True

Question 48

True or false | 10.9 is metric it's medium carbon steel

Answer 48

True

Question 49

How do you make aluminum stronger?

Answer 49

Cole rolling

Question 50

True or false | Cast irons are good for drilling

Answer 50

True

Question 51

True or false | The first number of the aluminum tells the percentage of aluminum is 1 copper is 2 and manganese is 3

Answer 51

True w

Question 52

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

Answer 52

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

Question 53

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.

Answer 53

True

Question 54

True or false | Thermoplastic doesn't change chemical structure

Answer 54

True

Question 55

What is the difference polypropylene and nylon?

Answer 55

How do you get rid of heat?

Question 56

How to get rid of heat?

Answer 56

Radiation Convection Conduction Evaporation