Chemical Bonding

Question 1

definition of ionic bonding

Answer 1

electrostatic attraction between positive and negative ions

Question 2

definition of covalent bonding

Answer 2

pair of electrons are shared between two atoms

Question 3

definition of metallic bonding

Answer 3

electrostatic attraction between delocalised electrons and metal ions

Question 4

definition of electronegativity

Answer 4

the ability of an atom to attract the bond pair of electrons towards itself in a covalent bond

Question 5

2 bonded pairs

Answer 5

linear
180
BeCl2

Question 6

3 bonded pairs

Answer 6

trigonal planar
120
BF3

Question 7

4 bonded pairs

Answer 7

tetrahedral
109.5
CH4

Question 8

3+1 bonded pairs

Answer 8

pyrimidal
107
NH3

Question 9

2+2 bonded pairs

Answer 9

V shaped
104.5
H2O

Question 10

5 bonded pairs

Answer 10

trigonal bypyrimidal
120 + 90
PF5

Question 11

6 bonded pairs

Answer 11

octahedral
90
SF6

Question 12

dative covalent bonding

Answer 12

one atom provides both the electrons needed for a covalent bond

Question 13

order of repulsion

Answer 13

lone pair-lone pair > lone pair - bond pair > bond pair - bond pair

Question 14

intermolecular forces

Answer 14

vanderwaals/permanent dipole-dipole/hydrogen bonding

Question 15

increase vander waals with..

Answer 15

number of electrons and contact points

Question 16

what is needed for hydrogen bonding..

Answer 16

hydrogen atom and electronegative element + long pair of electrons

Question 17

hydrogen bonding in water..

Answer 17

higher enthalpy change of vaporisation
surface tension
ice is less dense than water - long hydrogen bonds

Question 18

definition of bond energy

Answer 18

amount of heat needed to break 1 mol of compound into gaseous atoms

Question 19

definition of bong length

Answer 19

distance between the nuclei of two bonded atoms

Question 20

definition of bond polarity

Answer 20

atoms having dipole moment or separation of charges

Question 21

intermolecular forces influences..

Answer 21

bp/mp/temperature

Question 22

bonding influences..

Answer 22

reactivity

Question 23

electronegativity trend

Answer 23

increase across period, decrease down group

Question 24

polar molecule has (2)

Answer 24

asymetrical distribution of electron charge

two atoms are partially charged

Question 25

single covalent bond

Answer 25

s orbital

Question 26

double covalent bond

Answer 26

pi bond

Question 27

types of hybridisation

Answer 27

sp3/sp2/sp orbitals