Which of the following statements about 2-methylpropan-2-ol, CH3C(CH3)(OH)CH3, are correct ?
I and II only
I and III only
II and III only
I, II and III
Which of the following molecules has the biggest overall dipole?
The electronegativity of four elements are given below
N = 3.0 H = 2.1 F = 4.0 P = 2.1
What is the correct order of polarity for the following compounds
PH3 < PF3 < NF3 < NH3
PH3 < PF3 < NH3 < NF3
NF3 < NH3 < PH3 < PF3
PH3 < NH3 < NF3 < PF3
Which of the following compounds has both covalent and ionic bonds?
calcium bromide, CaBr2
potassium carbonate, K2CO3
propanoic acid, CH3CH2COOH
dichloromethane, CH2Cl2
Which is the best description of ionic bonding?
electrostatic attraction between cations and electrons
electrostatic attraction between nuclei
electrostatic attraction between oppositely charged ions
electrostatic attraction of nuclei towards shared electrons in the bond between the nuclei
Below are four molecules. Which is the most polar molecule present?
CH3NH2
CH4
CCl4
CO2
Potassium bromide is an ionic compound.
When can potassium bromide conduct electricity?
|
|
Solid |
Molten |
Aqueous |
|
A |
✓ |
✓ |
⨯ |
|
B |
✓ |
⨯ |
✓ |
|
C |
⨯ |
✓ |
✓ |
|
D |
⨯ |
⨯ |
✓ |
A periodic table is needed to answer this question.
Of the four compounds listed below which one has the greatest ionic character?
HCl
MgS
CO2
CaO
What is the correct formula for aluminium sulfate?
Al3(SO4)2
Al(SO4)2
Al2(SO4)3
AlSO4
Aluminium iodide, Al2I6 is a dimer and exists as a solid at room temperature. When it is a vapour it can exist as an AlI3 molecule.
How many valence electrons are in an aluminium iodide, AlI3, molecule?
22
24
26
28
