theory test

Question 1

heat of combustion

Answer 1

another name for burning. it is an example of an exothermic reaction, a reaction that releases energy to the surroundings. this is mostly thermal energy but light energy and sound energy is also released.

Question 2

Toxicity

Answer 2

The condition of producing adverse bodily effects due to poisonous qualities. is also how much a substance can damage an animal, plant, cell, organ or other organisms is its toxicity

Question 3

oxidation state

Answer 3

ability to oxidize what takes place by gaining oxygen, losing hydrogen, or losing electrons, and is a chemical property that results in the oxidation number of a substance being changed

Question 4

Conductivity

Answer 4

electrical conductivity is when a material allows current to flow through them easily. in contrast electrical insulators resist current passing through the material

Question 5

resistance

Answer 5

electrical resistivity is a funder mental property that quantifies how strongly a given material opposes the flow of electric current

Question 6

magnetism

Answer 6

is a force that can attract or repel objects that have a magnetic material like iron inside them. in simpler words, it is a property of certain substances which pull closer or repel other objects. magnetic objects are always made out of metal but not all metals are magnetic

Question 7

tensile strength

Answer 7

A measure of how much stress from pulling, or tension, material can withstand before breaking.

Question 8

Compression Strength

Answer 8

to resist pushing or crushing forces

Question 9

shear strength

Answer 9

measures the largest shear force a material can stand before ripping apart

Question 10

torsional strength

Answer 10

to resist twisting forces

Question 11

hardness

Answer 11

to be able to resist abrasive wear

Question 12

toughness

Answer 12

Mechanical Property of a material that indicates the ability of the material to handle overloading before it fractures.

Question 13

Elasticity

Answer 13

to be able to flex and bend

Question 14

Plasticity

Answer 14

to be able to be permanently changed by external forces

Question 15

Ductility

Answer 15

the ability of a substance to be drawn, pulled, or extruded through a small opening to produce a wire

Question 16

durability

Answer 16

the ability to withstand wear, pressure, or damage.

Question 17

Malleability

Answer 17

the ability of a substance to be hammered or beaten into thin sheets

Question 18

Reflectivity

Answer 18

when the light from an object is reflected by a surface, it changes direction. it bounces off the surface at the same angle it hits it. smooth shiny such as mirrors and polished metals reflect light well

Question 19

Non-ferrous metal

Answer 19

any metal which is not formed from iron. It is measured in ounces per square foot. Copper and bronze are non-ferrous metals used in casket construction.

Question 20

Ferrous metals

Answer 20

metals containing iron. metals such as stainless steel and mild steel are ferrous metals

Question 21

properties of non-ferrous metals

Answer 21

corrosion-resistant,

malleable, ductile,

tough,

good electrical conductor and easily machined

Question 22

Properties of ferrous metals

Answer 22

tough,

ductile
,
magnetic,

malleable,

hard and brittle

Question 23

what is an alloy

Answer 23

alloys are mixtures of two or more metals that have improved properties and characteristics

Question 24

what does the addition of carbon do to ferrous

Answer 24

it improves and enhances its properties

Question 25

Name 3 ferrous metals

Answer 25

mild steel, cast iron, and stainless steel

Question 26

mild steel properties

Answer 26

magnetic, Tough, ductile, malleable, good tensile strength, poor resistance to corrosion

Question 27

cast iron properties

Answer 27

hard, brittle, magnetic

Question 28

stainless steel properties

Answer 28

difficult to cut, sometimes magnetic, hard, tough, excellent corrosion resistance

Question 29

Mild steel composition

Answer 29

iron | 0.1-0.3% carbon

Question 30

Cast Iron Composition

Answer 30

iron | 2-4% carbon

Question 31

stainless steel composition

Answer 31

``` alloy 10.5% carbon + iron 10.5-18% chromium 8% nickel 8% magnesium ```

Question 32

Use of mild steel

Answer 32

screws nails bolts

Question 33

use of cast iron

Answer 33

machine parts vices manhole covers

Question 34

stainless steel uses

Answer 34

cutlery, kitchen sinks, pots, and pans, surgical instruments

Question 35

Aluminum properties

Answer 35

malleable, Light, weaker than steel, easy to work with, expensive, non-toxic, good barrier down to 1 mil, non-magnetic, does not rust, salt causes corrosion, no "taste," excellent recycle record.

Question 36

Copper properties

Answer 36

``` corrosion-resistant malleable ductile tough easily machined good electrical conductor ```

Question 37

Brass properties

Answer 37

casts well harder than copper easily machined

Question 38

Titanium properties

Answer 38

high strength-to-weight ratio and corrosion resistance at room and elevated temperature

Question 39

silver properties

Answer 39

the highest conductivity of electricity and heat of any metal

Question 40

Zinc properties

Answer 40

not corrosion-resistant prevents the steel from rusting

Question 41

Aluminum composition

Answer 41

pure metal

Question 42

Copper composition

Answer 42

pure metal

Question 43

Brass composition

Answer 43

alloy 65% copper 35% zinc

Question 44

what is a thermosetting polymer?

Answer 44

A polymer that consists of polymer chains with cross-links between them so they do not melt when they are heated

Question 45

properties of thermosetting polymers

Answer 45

adhesive, durability, heat/flame resistant, hard, brittle, electrical insulators, high tensile strength

Question 46

forms of thermosetting polymers

Answer 46

kettles, plugs, laptop chargers, electrical appliances

Question 47

name 3 thermosetting polymers

Answer 47

phenol-formaldehyde, polyimides, polyurethane

Question 48

once formed thermosetting polymers

Answer 48

cannot be altered. this also means that they cannot be recycled or used again for another engineered product

Question 49

what are polymers used for

Answer 49

medicines, household goods, and building materials

Question 50

what happens when heat is applied to a thermosetting polymer

Answer 50

they do not melt when heat is applied and cannot be reframed by applying heat

Question 51

Plastics

Answer 51

plastics are oil-based materials that rely on the constant production of oil or the recycling of existing plastic products to maintain their production