Topic 2a- Materials

Question 1

Allotropes

Answer 1

Different forms of carbon

Question 2

Alloy

Answer 2

A mixture of a base metal and small amount of other elements

Question 3

Annealing aka normalizing

Answer 3

A process in which a metal is heated until red hot, then allowed to cool naturally

Question 4

Base metal

Answer 4

The main metal in an alloy

Question 5

Brittle

Answer 5

Shatters if hit

Question 6

Carat

Answer 6

A scale for measuring the purity of gold

Question 7

Ductile

Answer 7

Able to be stretched into wires

Question 8

Lustrous

Answer 8

Shines when polished or freshly cut

Question 9

Malleable

Answer 9

Able to be hammered into new shapes

Question 10

Metalloid aka semi metal

Answer 10

An element that usually displays the properties of a non metal but conducts electricity like a metal under certain conditions

Question 11

Quenching

Answer 11

A process in which a heated metal is cooled rapidly by dropping it into water

Question 12

Stainless steel

Answer 12

A rustless alloy of steel that includes chorinium and nickel

Question 13

Steel

Answer 13

An alloy of iron and carbon

Question 14

Tempering

Answer 14

A process in which a metal is heated, cooled rapidly and then reheated

Question 15

Carbon nanotube

Answer 15

A nano sized cylinder of carbon atoms

Question 16

Contact angle

Answer 16

The angle that the base of a drop of water makes with the surface it is on

Question 17

Hydrophilic

Answer 17

Surfaces that attract water and allow it to stick to them

Question 18

Hydrophobic

Answer 18

Surfaces that do not allow water to stick to them

Question 19

Malignant

Answer 19

Rapidly growing and dangerous cancerous cells

Question 20

Metastasize

Answer 20

When cancer cells spread beyond their original site into the rest of the body

Question 21

Nanometer

Answer 21

Unit of length equal to one billionth of a meter or one thousandth of a millimeter (unit-nm)

Question 22

Nanoparticle

Answer 22

A particle or structure that is too small to be seen with a normal light microscope

Question 23

Nanopharmaceutical

Answer 23

A medical drug that is a Nanoparticle or is delivered by a nano sized structure

Question 24

Nanotechnology

Answer 24

The study of how to produce, and control, structures at a scale below the size of visible particles but larger than atoms

Question 25

Nitinol

Answer 25

A shape memory alloy made of nickel and titanium

Question 26

Photocatalytic

Answer 26

An effect where sunlight causes materials to become electrically charged and able to react with organic matter and other particles

Question 27

Shape memory alloy (sma)

Answer 27

A mixture of metals that changes shape as the temperature changes

Question 28

Stent

Answer 28

A mesh sleeve that is inserted into clogged arteries to keep them open

Question 29

Acid

Answer 29

A substance that releases hydrogen ions into an aqueous solution

Question 30

Alkali

Answer 30

A base that dissolves in water

Question 31

Alkaline solution

Answer 31

A solution made up of base/alkali and water

Question 32

Base

Answer 32

A substance that releases hydroxide ions

Question 33

Hydrogen ion

Answer 33

H+, released by acids

Question 34

Hydroxide ion

Answer 34

OH-, formed by bases

Question 35

Indicator

Answer 35

A chemical that changes colour to show whether a substance is acidic, neutral or basic

Question 36

Litmus paper

Answer 36

A common indicator that turns red in the presence of an acid and blue in the presence of a base

Question 37

pH

Answer 37

A scale used to measure he concentration of H+ ions in a solution