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Chemistry (إلحقوني) > 2.4 Properties and what not > Flashcards

2.4 Properties and what not Flashcards

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1
Q

MP and BP of metallic structures?

A

Varies

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2
Q

Volatility of Metallic structures

A

Low

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3
Q

Solubility of metallic structures?

A

Low

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4
Q

Thermal&Electrical conductivity of metallic structures?

A

High

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5
Q

Are metallic structures brittle?

A

No their malleable

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6
Q

Are metallic structures susceptible to corrosion?

A

Yes

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7
Q

Ionic Structure properties

A

MP/BP: High
Volatility: low
Water Soluble: Varies
Electrical/Thermal conductor: only when molten/dissolved, No
Briitle?: yes
Susceptible to Corrosion: varies

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8
Q

Why are ionic crystals brittle?

A

The ions within them cannot easily slide past each other.

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9
Q

Elastic

A

Will change in shape when subjected to a force, and return to their original shape after the force is removed.

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10
Q

Plasticity

A

A property of a material that retains it’s deformed shape even after the force Is removed.

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11
Q

Corrosion

A

The oxidation of a metal in the presence of O2 or H2O

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12
Q

Silicon is between the metallic and covalent regions, outline it’s properties?

A
  • Metalloid
  • Shiny/lustrous like a metal
  • Forms covalent bonds, brittle and forms weakly acidic oxide.
  • Semiconductor, poor electrical conductors, yet it increases when heated, illuminated, or in the presence of certain impurities.
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13
Q

Magnesium Iodide has a 50/50 percentage of ionic and covalent character, what are it’s properties?

A

High lattice enthalpy

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14
Q

AlCl3 is ionic but has significant covalent contribution, properties?

A
  • Unusually low boiling point (Bonding triangle not always accurate since magnesium iodide is also in that region).
  • Forms ionic lattices when solid,
  • melts into Al2Cl6 dimers at high-pressure at 190C, very low for an ionic compound
  • Soluble in non-polar solvents such as Cl3CH4
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15
Q

Alloys

A

Mixtures of pure metals and other metallic or non-metallic substances. Components of alloys retain their physical properties.

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16
Q

How does alloying make metals stronger?

A
  • Adding ions with different radii to the cations of the pure metal disrupts the regular structure of the lattice by not allowing the layers of cations to slide easily past each other.
17
Q

Nak is a

A

sodium-pottasium alloy

18
Q

What property of NaK makes it used as a nuclear reactant coolant that is non-volatile and can be pumped as any other liquid?

A

It has a lower melting point than its constituents, liquid at room temperature.

19
Q

Memory metals

A

Alloys that return to their original shape upon heating.

20
Q

Properties of pure iron

A
  • can be deformed relatively easily
21
Q

Properties of Steel

A
  • Harder than pure iron
  • Rusts in the presence of water and elemental oxegyn, transforms it into hydrated iron(III) oxide, (ionic compound with no valuable properties of metals )
22
Q

What are some examples of rust protection methods?

A
  • Barrier methods (painting or oiling)
  • Sacrificial methods (galvanizing by adding zinc)
23
Q

Why does stainless steel have applications in cooking and medical-grade equipment?

A
  • Iron alloy contains at least 11% chromium, which reacts with O2 or H2O to form a chromium oxide layer that prevents rusting.
24
Q

A lil properties of polymers in general 😛🙏

A
  • Low thermal and electrical conductivity
  • Low density
  • Vary large molecules (large molecules)
25
Q

Repeating unit

A

A group of atoms that appears repeatedly along a polymer chain.

26
Q

Why are polymers low in electrical and thermal conductivity?

A

Macromolecular nature, don’t contain moving charged particles.

27
Q

Why are polymers high in melting and boiling points?

A

-Intermolecular forces along the polymers
- Long polymers can wind up and take more energy to disentangle

28
Q

Cellulose

A
  • Polymers of glucose that support fibrous structures in plants.
  • Can firm H-binds due to -OH groups which makes them strong.
29
Q

Starch

A
  • Glucose polymer that can be broken down and easily digested.
  • Irregular branched structure, cannot be packed as tightly as cellulose and therefore forms fewer hydrogen bonds
30
Q

Plastics

A

Synthetic polymers composed mostly of carbon and hydrogen.

31
Q

Some properties of plastics

A
  • often chemically interactive
  • can catch fire and sustain combustion
32
Q

Polystyrene Properties

A
  • Non-polar hydrocarbon so insoluble in water
  • LDFs hold chains together, can be overcome by heating for reshaping, reform between molecules so the polymer solidifies again.
  • Cannot rotate easily due to C6H5, so it’s brittle
  • Good thermal insultatpr particularly in its expanded form.

Chemistry (إلحقوني) (8 decks)

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