When given molecular formulas how do you identify the strongest intermolecular f
ID: 993785 • Letter: W
Question
When given molecular formulas how do you identify the strongest intermolecular force present in each compound?
When given molecules or atoms and a process, how do you identify what attractive forces or bond must be overcome to accomplish it: e.g. melting or dissolving a substance
When given a set of compounds how do you identify the one with the highest boiling point?
How do you determine the number of spheres in a SC, BCC, or FCC unit cell?
When given an edge and angle relationships how do you identify which of the 7 basic unit cells it is?
When given a phase diagram how do you identify given points on the phase diagram and/or what transition (such as freezing or boiling) occurs between them?
How can you identify between strong electrolytes, weak electrolytes and nonelectrolytes?
What is the relationship between solubility of gases and temperature?
What are the most ideal and least ideal conditions for a gas?
Explanation / Answer
Q.1: The order of strength of different intermolecular forces are
Ionic bonding > Hydrogen bonding > Dipole-Dipole interaction > Dispersion force (london force)
Q.2: To melt a solid substance we must overcome the force due to metalic bonding for metals, ionic bonding for ionic compounds, etc. To boil a substance we must overcome forces like hydrogen bonding, dipole - diple interaction etc. To dissolve a substance we must overcome lattice energy of the ionic compound.
Q.3: Compounds bonded through ionic bonding usually have the highest boiling point followed by covalent bonding, hydrogen bonding, dipole - dipole interaction and dispersion force. Hence the order is
Ionic bonding > covalent bonding > Hydrogen bonding > dipole - dipole interaction > dispersion force
Q.4: In SC there is one atom at each corner shared by 8 atoms and there are a total of 8 corners. Hence number of atoms per unit cell = (1/8) x 8 = 1 atom per unit cell.
In BCC, there is one complete atom at the center and one atom at each corner shared by 8 atoms and there are a total of 8 corners. Hence number of atoms per unit cell = 1 + (1/8) x 8 = 2 atoms per unit cell.
In FCC, there is 1 atom at each face of the cube shared by 2 unit cells. also one atom at each corner shared by 8 atoms and there are a total of 8 corners. Hence number of atoms per unit cell = 6 x (1/2) + (1/8) x 8 = 4 atoms per unit cell.
Q. Strong electrolytes are completely dissociated into the corresponding ions when dissolved in water and conduct electricity. Ionic compounds are usually strong electrolytes. Weak electrolytes are partly dissociated into the corresponding ions when dissolved in water and conduct very less electricity. Covalent compounds are weaak electrolytes. Non-electrolytes are not dissociated into ions when dissolved in water, e.g; glucose
Q: Solubility decreases with increase in temperature.
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