London dispersion forces are formed due to instantaneous ______________ formation.
dipole
From these three choices, CH4 , NH3 and H2O , which one does NOT have the capacity for hydrogen bonding?
CH4 does not use hydrogen bonding because the difference in electronegativity between C and H is too small.
Which statement explains the attraction between the water molecules?
Water is a polar molecule. The slightly negative end of the molecule attracts to the slightly positive end of other molecules. This forms a weak connection between the molecules.
Which of the following compounds are most likely to form hydrogen bonds?
H2O
Which of the following statements best explains why ice floats on water?
Hydrogen bonding causes water to be less dense in the solid state than in the liquid state .
Substances that exhibit hydrogen bonding or dipole-dipole forces are generally soluble in ______________.
water
Are melting points of molecular compounds generally higher than, lower than, or the same as those of ionic compounds?
lower than
Which statement best explains these properties?
Ammonia is polar and experiences hydrogen bonding attractions between neighboring molecules and makes it harder to overcome the intermolecular forces needed for the phase change from liquid to gas.
Intermolecular forces include all of the following EXCEPT:
covalent bonding
The most important intermolecular force in CCl4 is:
london dispersion forces
The ________ shape of water allows several water molecules to bond together, which influences its physical properties.
bent
Select the substance with the lowest boiling point and identify the most important intermolecular force responsible for the difference in boiling point.
CH4 has the lowest boiling point because it uses London dispersion forces.
London dispersion forces are formed due to instantaneous _____ formation.
dipole
What is a term for attractive forces that occur between polar molecules?
dipole-dipole forces
Generally, are London dispersion forces stronger or weaker than dipole-dipole forces?
weaker
Movement of the ____________ creates the London dispersion forces.
electrons
When you put sodium metal in liquid ammonia, what is the intermolecular attraction between Na+ ions and NH3 molecules?
Ion-dipole
When KOH dissolved in ethanol, what is the intermolecular attraction between OH- ions and C2H5OH molecules?
Ion-dipole`
Which statement about London dispersion forces is TRUE?
London Dispersion forces are temporary in nature.
When KCl dissolved in ethanol, what is the intermolecular attraction between K+ ions and ethanol molecules?
Ion-dipole
What are dipole-dipole forces?
intermolecular force between polar molecules
Which noble gas below has the lowest boiling point?
Ne
Which of the following is the weakest intermolecular force?
London dispersion force
When KNO3 dissolved in water, what is the intermolecular attraction between NO3 - ions and H2O molecules?
Ion-dipole
Which of the following statements best explains why ice floats on water?
Hydrogen bonding causes water to be less dense in the solid state than in the liquid state.
Which of the following compounds is most likely to form hydrogen bonds?
H2O
The _________ shape allows several water molecules to bond together, which influences its physical properties.
bent
Which of the following compounds is/are most likely to form hydrogen bonds?
HF
Complete the sentence using one of the following terms: proton, neutron or electron.
When H is covalently bonded to N, O or F, the strongly electronegative atoms pull the electrons in the covalent bond close to themselves, leaving H as almost a bare ___________.
proton
Which of the following does not have hydrogen bonds?
Hydrogen chloride
The O-H covalent bond in a water molecule is best described as being _____.
very polar
In addition to hydrogen bonding, what also contributes to the fact that ice is less dense than liquid water?
its bent shape
In the case of hydrogen bonds, the hydrogen donor is strongly:
Electronegative
True or False:
Because the molecular weight of hydrogen chloride is heavier than that of water, the boiling point of hydrogen chloride is higher than that of water
False
Properties of solids depend on:
All of the above
Complete the sentence using one of the following terms: water, hexane or oil.
Substances that exhibit hydrogen bonding or dipole-dipole forces are generally soluble in __________.
water
Are melting points of molecular compounds generally higher or lower than those of ionic compounds?
lower
Intermolecular forces are _____ as compared to intra-molecular forces.
Much weaker
What type of solid is diamond?
covalent network
Why do covalent crystals have high melting and boiling points?
The network covalent bond is very strong.
Which of the following statements is wrong?
Covalent compounds are generally soluble in polar solvents
Diamond is composed entirely of _____ atoms that are connected by _____ bonds.
carbon; covalent
Intermolecular forces include all of the following EXCEPT _____
covalent bonding
Nonpolar solvents will most easily dissolve solids that are
nonpolar.
This is the structure picture of fullerene (C60).
The type of chemical bond that holds fullerene (C60) together is
covalent