Materials Flashcards

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1
Q

Atomic mass

A

Number of protons + neutrons

Neutrons = atomic mass - atomic number

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2
Q

Electrons

A
  • charge , no mass, out side shells 2,8,8
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3
Q

Protons

A

+ charge, mass of 1 , found in nucleus

Ie. If have an atomic number of 6 = a mass of 6

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4
Q

Neutron

A

No charge, found in nucleus, mass of 1

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5
Q

h20

A

Hydrogen oxide, water

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6
Q

C02

A

Carbon dioxide

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7
Q

Nh3

A

Ammonia

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8
Q

Compound

A

2 or more elements

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9
Q

Properties of metals

A
  • high density
  • strong
  • electrical conductors
  • thermal conductors
  • malleable e.g squish cans
  • solid at room temperature
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10
Q

Properties of non metals

A
  • poor conductors of electricity and heat
  • dull , don’t shine
  • low melting points
  • low density
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11
Q

Pure metal (base metals)

A

Made from one element e.g silver

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12
Q

Metallic bonding e.

A

Physical not chemical bond

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13
Q

Alloy

A

Mixture of two elements
E.g instead of steel, stainless steel

  • better
  • improved
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14
Q

Common alloys

A

Bronze = good conductor, low friction - wires

Brass = highly workable, durable, low friction Instruments

Coin metal = highly workable - coins

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15
Q

Ores

A

A rock that contains elements that can be extracted

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16
Q

Common ores

A

Iron ore - extracted from the hematitive + magnetite

Magnestite - magnesium oxide + carbonate

17
Q

Demoncritus

A

Indivisible particles

18
Q

Thomson

A

Plumb pudding model

Positively charges spheres with electrons embedded in them

19
Q

Bohr

A

Shell model

Same as Rutherford but electrons orbiting in energy levels

20
Q

Rutherford

A

Solar system model

Atom is empty space with positively charged nucleus and electrons orbiting the nucleus

21
Q

Chadwick

A

Shell model

Electrons orbit nucleus, which is neutral containing protons and neutrons

22
Q

Properties of acids

A
  • have hydrogen irons h+
  • are chorosive ( burns )
  • are sour
  • conduct electricity
23
Q

Properties of alkali or bases

A
- have hydroxide irons   Oh-
( poly atomic iron - more than one element)
- are caustic 
- are bitter
- conduct electricity
24
Q

Ph

A

Ph is a measure of acidity and alkalinity

25
Q

Neutralisation

A

Occurs when you mis acid and alkali

7 is neutral

Acid+ base —> salt + water

26
Q

Atomic number

A

Top one

Number of protons( equal to electrons if neutral)