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Flashcards in theory test Deck (51)
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1

heat of combustion

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.

2

Toxicity

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

3

oxidation state

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

4

Conductivity

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

5

resistance

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

6

magnetism

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

7

tensile strength

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

8

Compression Strength

to resist pushing or crushing forces

9

shear strength

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

10

torsional strength

to resist twisting forces

11

hardness

to be able to resist abrasive wear

12

toughness

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

13

Elasticity

to be able to flex and bend

14

Plasticity

to be able to be permanently changed by external forces

15

Ductility

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

16

durability

the ability to withstand wear, pressure, or damage.

17

Malleability

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

18

Reflectivity

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

19

Non-ferrous metal

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.

20

Ferrous metals

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

21

properties of non-ferrous metals

corrosion-resistant,

malleable, ductile,

tough,

good electrical conductor and easily machined

22

Properties of ferrous metals

tough,

ductile
,
magnetic,

malleable,

hard and brittle

23

what is an alloy

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

24

what does the addition of carbon do to ferrous

it improves and enhances its properties

25

Name 3 ferrous metals

mild steel, cast iron, and stainless steel

26

mild steel properties

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

27

cast iron properties

hard, brittle, magnetic

28

stainless steel properties

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

29

Mild steel composition

iron
0.1-0.3% carbon

30

Cast Iron Composition

iron
2-4% carbon

31

stainless steel composition

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

32

Use of mild steel

screws
nails
bolts

33

use of cast iron

machine parts
vices
manhole covers

34

stainless steel uses

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

35

Aluminum properties

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.

36

Copper properties

corrosion-resistant
malleable
ductile
tough
easily machined
good electrical conductor

37

Brass properties

casts well
harder than copper
easily machined

38

Titanium properties

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

39

silver properties

the highest conductivity of electricity and heat of any metal

40

Zinc properties

not corrosion-resistant prevents the steel from rusting

41

Aluminum composition

pure metal

42

Copper composition

pure metal

43

Brass composition

alloy
65% copper
35% zinc

44

what is a thermosetting polymer?

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

45

properties of thermosetting polymers

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

46

forms of thermosetting polymers

kettles, plugs, laptop chargers, electrical appliances

47

name 3 thermosetting polymers

phenol-formaldehyde, polyimides, polyurethane

48

once formed thermosetting polymers

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

49

what are polymers used for

medicines, household goods, and building materials

50

what happens when heat is applied to a thermosetting polymer

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

51

Plastics

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