Topic 3: Bonding in compounds

Question 1

what are covalent networks made of

Answer 1

millions of atoms joined by covalent bonds

Question 2

strongest intermolecular force

Answer 2

hydrogen bonding

Question 3

weakest intermolecular force

Answer 3

london dispersion force (LDF)

Question 4

what elements does hydrogen need to be attached to be hydrogen bonding

Answer 4

nitrogen, oxygen or fluorine

Question 5

define viscosity

Answer 5

the viscosity of a liquid is a measure of how ‘thick’ a liquid is, or how easily it pours

Question 6

what’s the general rule for the solubility of substances

Answer 6

polar molecules tend to dissolve in polar solvents and non polar molecules tend to dissolve in non polar

Question 7

define an ionic bond

Answer 7

the electrostatic attraction between between positive ions and negative ions

Question 8

if a compound is a gas at room temperature it is…

Answer 8

probably covalent molecular

Question 9

if a compound is a liquid at room temperature it is…

Answer 9

probably covalent molecular

Question 10

if a compound is a solid at room temperature it is…

Answer 10

probably ionic lattice, possibly covalent network

Question 11

if a compounds melting point is high

Answer 11

probably covalent molecular

Question 12

if a compounds melting point is low

Answer 12

ionic lattice or covalent network

Question 13

if a compound is insoluble in water

Answer 13

non polar covalent

Question 14

if a compound is soluble in water

Answer 14

ionic or polar covalent

Question 15

if a compound never conducts

Answer 15

covalent

Question 16

if a compound conducts as liquid/solution only

Answer 16

ionic

Question 17

if a compound always conducts

Answer 17

metalic