06/11 S&B Flashcards

1
Q

Why only carbon n silicon can have C.N.S structure?

A

4 valency - able to form multiple bonds so is able to form a network

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2
Q

(Table)Molecular substance has…

A

Weak intermolecular forces

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3
Q

What particles do Ionic substances have(NOT FORMED)?

A

they HAVE
Cations and Anions

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4
Q

What r bond dipoles?

A

Polarity between two atoms(the arrow thingy)

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5
Q

Bond dipole arrow for H and C?

A

+left to right-

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6
Q

What is a temporary dipole?

A

Constant movement of electrons throughout the nucleus

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7
Q

Explain polarity(7 things)

A
  • final shape
  • polar bonds
  • ē-negative atom
  • symmetry
  • net dipole
  • cancel out
  • polarity
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8
Q

Explain shapes(6 things)

A
  • roncs
  • central atom
  • parent shape
  • REPEL into max seperation DUE TO RONC REPULSION
  • bonded unbonded regions
  • final shape
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9
Q

Which absorbs which releases heat?(endo exo)

A

endo absorbs
exo releases

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10
Q

Endo reactions?

A

melting, evaporating, subliming

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11
Q

Exo reactions?

A

freezing, condensation, deposition

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12
Q

3rd and 4th shell max electrons?

A

18, 32

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13
Q

(mole)Divide what with n?
n being number of [element]

A

the fucking enthalpy

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14
Q

malleable(5) n brittle(5) properties?

A
  • metallic bonds
  • cations and delocalised ē
  • non-directional bonds
  • layers shift without breaking
  • malleable when pressure applied
    break
  • ionic/covalent bonds
  • cations + anions/electrons
  • directional bonds
  • layers shift n align to repel
  • breaks when pressure applied
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15
Q

(Polarity) Dissolving solvents

A

(polar & nonpolar)non-polar inter forces r weaker, cannot overcome strong polar bonds

(polar & polar)negative attracts positive, strong enough to overcome, can disolve

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16
Q

In H2O, which atoms are positives and which are negatives?

A

oxygen: –ive
hydrogen: +ive

17
Q

(the diagram thingy)cations and anions bond to what?

A

cations bond to the oxygen of H2O
anions bond to the hydrogens of H2O

18
Q

when is energy released or absorbed?

A

release when -ive enthalpy
absorb when +ive enthalpy

19
Q

why the bond angles lidat?

A

to minimise electron-electron repulsion

20
Q

endo reactions break what?

A

intramolecular bonds

21
Q

what repels into a maximum seperation of blablabla??

A

RONCs :sed:

22
Q

electrons are also charged particles, right?

A

yes bitch! just negatively charged

23
Q

for thingys to conduct electricity, there must be what?

A

free charged particles

24
Q

what happens to the atoms in molten/aqueous state?

A

they r able to flow freely

25
Q

melting boiling point stuffs(2)

A
  • 3D lattice, weak inter forces, bonds
  • amount of energy needed to melt/boil