Which of the following dipole labels are not correct?
Magnesium oxide has a very high melting temperature.
Which of the following is the best description of its structure and bonding?
Giant ionic
Giant metallic
Macromolecular
Simple molecular
Which of the following compounds is polar?
CCl4
BF3
PH3
CH3CH3
Which of the following statements is not correct?
The strongest type of intermolecular force in ammonia is hydrogen bonding
The strongest type of intermolecular force in water is hydrogen bonding
The strongest type of intermolecular force in hydrogen chloride is permanent dipole
The strongest type of intermolecular forces in ethanol is permanent dipole
Which of the following shows the correct order of boiling points for pentane, butane and propane?
CH3CH2CH3 > CH3CH2CH2CH3 > CH3CH2CH2CH2CH3
CH3CH2CH2CH2CH3 > CH3CH2CH2CH3 > CH3CH2CH3
CH3CH2CH2CH3 > CH3CH2CH2CH2CH3 > CH3CH2CH3
CH3CH2CH3 > CH3CH2CH2CH2CH3 > CH3CH2CH2CH3
Substance L has the following properties.
|
Melting Point |
Electrical conductivity |
|
660 oC |
When solid |
When molten |
|
Yes |
Yes |
What is likely to be the identity of substance L?
Graphite
Li2O
NaCl
Al
Which of the following statements about ethylamine, CH3CH2NH2, is correct?
The strongest type of intermolecular force are London dispersion forces
The nitrogen atom does not have a lone pair present
The strongest type of intermolecular force is permanent dipole permanent dipole forces
The strongest type of intermolecular force is hydrogen bonding
Which of the following statements about butane, CH3CH2CH2CH3, and propanone, CH3COCH3 are correct?
I and II only
I and III only
II and III only
I, II and III
What is the correct order of decreasing melting points for group 1 metals?
Na > K > Rb > Cs
Na > K > Cs > Rb
Cs > Rb > K > Na
K > Na > Rb > Cs
Which of the following statements about alloys are correct?
I and II only
I and III only
II and III only
I, II and III
