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Flashcards in Structure And Bonding Deck (18)
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1

What is the melting and boiling points of ionic compounds?

High
Giant ionic lattice held together by strong electrostatic forces

2

Are ionic compounds soluble?

Tend to be
Water molecules are polar
Water molecules are attracted to charged ions

3

Do ionic compounds conduct electricity?

When molten or dissolved
Ions carry a charge

4

What is the formula of the following ions
Nitrate
Carbonate
Sulfate
Ammonium

NO3 -
CO3 -2
SO4 -2
NH4 +

5

What is a covalent bond?

Strong electrostatic attraction between a shared pair of electrons and the nuclei of the bonded atoms

6

What is a dative covalent bond?

Both electrons come from one atom

7

What is bond enthalpy?

Measures energy required to break a covalent bond

8

Which electron pairs repeal the most?

Lone pair/ lone pair then lone pair/ binding pair then bonding pair

9

What shape has 2 electron pairs around the centre and what is the bond angle?

Linear molecule
180
CO2

10

What molecule has a bond angle of 120?

Triage all planer
3 pairs no lone
BF3

11

What are the different molecule shapes with 4 electron pairs?

Tetrahedral - no lone 109.5 CH4
Trigonal pyramidal - 1 lone 107 NH3
Nonlinear - 2 lone 104.5 H2O

12

What shape is a molecule with 6 electron pairs?

Octahedral - 90
SF6

13

What is electronegativity?

An atoms ability to attract the electron pair in a covalent bond

14

How can covalent bonds be polarised by differences in electronegativity?

Electrons are pulled towards the most electronegative atom making a polar bond
Cause a permanent dipole

15

When is a molecule polar?

If it's not symmetrical - charges don't cancel

16

Explain induced dipole dipole forces

Cause all atoms and molecules to attract each other
Temporary dipole when electrons on one side
Induce a dipole in neighbouring molecule

17

Explain hydrogen bonding

Only happens when hydrogen is bonded to fluorine, nitrogen or oxygen
Between lone pair of electrons and another molecule

18

What is an ionic bond

Electrostatic attraction between two oppositely charge ions