06/11 S&B

Question 1

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

Answer 1

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

Question 2

(Table)Molecular substance has…

Answer 2

Weak intermolecular forces

Question 3

What particles do Ionic substances have(NOT FORMED)?

Answer 3

they HAVE
Cations and Anions

Question 4

What r bond dipoles?

Answer 4

Polarity between two atoms(the arrow thingy)

Question 5

Bond dipole arrow for H and C?

Answer 5

+left to right-

Question 6

What is a temporary dipole?

Answer 6

Constant movement of electrons throughout the nucleus

Question 7

Explain polarity(7 things)

Answer 7

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

Question 8

Explain shapes(6 things)

Answer 8

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

Question 9

Which absorbs which releases heat?(endo exo)

Answer 9

endo absorbs
exo releases

Question 10

Endo reactions?

Answer 10

melting, evaporating, subliming

Question 11

Exo reactions?

Answer 11

freezing, condensation, deposition

Question 12

3rd and 4th shell max electrons?

Answer 12

18, 32

Question 13

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

Answer 13

the fucking enthalpy

Question 14

malleable(5) n brittle(5) properties?

Answer 14

• 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

Question 15

(Polarity) Dissolving solvents

Answer 15

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

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

Question 16

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

Answer 16

oxygen: –ive
hydrogen: +ive

Question 17

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

Answer 17

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

Question 18

when is energy released or absorbed?

Answer 18

release when -ive enthalpy
absorb when +ive enthalpy

Question 19

why the bond angles lidat?

Answer 19

to minimise electron-electron repulsion

Question 20

endo reactions break what?

Answer 20

intramolecular bonds

Question 21

what repels into a maximum seperation of blablabla??

Answer 21

RONCs :sed:

Question 22

electrons are also charged particles, right?

Answer 22

yes bitch! just negatively charged

Question 23

for thingys to conduct electricity, there must be what?

Answer 23

free charged particles

Question 24

what happens to the atoms in molten/aqueous state?

Answer 24

they r able to flow freely

Question 25

melting boiling point stuffs(2)

Answer 25

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