Intermolecular Forces
Boiling/Melting Point
Ions
Hydrogen Bonding
Random
100
Intermolecular forces are attractive forces that occur between _______
Molecules
100
What is the periodic trend for boiling point?
Boiling point increases DOWN the periodic table and towards the MIDDLE of the table.
100
What type of intramolecular bonding results in ions?
Ionic bonding
100
[curveball: not H bonding]
An atom that has 6 protons, 6 neutrons, and 6 electrons has a mass of approximately:
12u (aka 12 amu)
100
Can a compound contain both ionic and covalent bonds?
Yes! NaCN is an example. There are covalent bonds between C and N then ionic bonds between Na+ and CN-
200
Intramolecular forces are attractive forces that occur within _______ and between _____
Within molecules
Between atoms
200
What is the melting point periodic trend?
Melting point increases DOWN the periodic table and towards the MIDDLE of the table.
200
Identify the type of chemical bond that forms when Potassium reacts with Bromine to form a salt
an Ionic bond
200
Molecules with hydrogen bonds have what considering boiling points
What is high boiling points
200
Which property is used to determine the degree of polarity between two bonded atoms?
Electronegativity
300
Very strong dipole-dipole attractive forces observed exclusively in compounds that have an F, O, or N boned directly to a hydrogen atom
What is Hydrogen bonding
300
What is the abbreviation of Tungsten?
W
300
If a solution has a higher concentration of ions, that solution has a greater ability to conduct ______
electric current
300
The best structured hydrogen bond is
What is the water molecule
300
Which formula represents a polar molecule?
1. O2 2. CO2
3. NH3 4. CH4
3. NH3
Because the bond between N (super electronegative) and H is extremely polar, and there are 3 bonds so the polarity doesn't cancel out like it does in CH4 and CO2
400
Which element in Group 16 bonds with H to form the strongest Hydrogen bonds between its molecules?
Oxygen
400
Which of these elements has the highest boiling point?
1. Mg 2. Na
3. Rb 4. Sr
4. Sr
Because it is below, and towards the middle, compared to the other 3.
400
Which sample of matter has particles in a crystalline structure?
NaCl (aq) or CuSO4 (s)
CuSO4 (s)
Both are salts, but only solid salts form a crystal.
400
The hydrogen atoms most commonly bonds with which other atoms
What is Fluorine, Oxygen, and Nitrogen
400
Which pair of atoms has the most polar bond?
H-Cl H-Br
H-Cl because Chlorine is more electronegative than Bromine
500
Which substance has the strongest intermolecular forces?
1. HF (Boiling Point 293K) 2. HI (Boiling Point 237K)
3. HBr (Boiling Point 207K)
4. HCl (Boiling Point 188K)
1) HF has the strongest intermolecular forces because its boiling point is the highest. It takes more energy to break those intermolecular bonds.
500
Which element has the highest melting point?
Tungsten
500
State the relationship between concentration of ions and boiling point.
A higher concentration of ions in solution results in a higher boiling point.
500
Draw a hydrogen bond between two water molecules. Include partial positive and negative charges.
500
How many pairs of electrons are shared between nitrogen atoms in a molecule of N2?
5, 2, 3, or 6
3 pairs (triple bond) = 6 electrons
Because N has 5 valence electrons and thus each one needs 3 more to get to 8.