The one with the weakest IMF will have the lowest boiling point. CH4 has only dispersion forces while all the others have dispersion PLUS either dipole-dipole (HCl, H2S, NH3), and/or hydrogen bonding (NH3). So, CH4 will have the lowest boiling point.
Which compound has the lowest boiling point IB chemistry?
It has a molecular formula C4H10O. Since, all the compounds are isomers and have the same molecular formula, therefore, the one with the highest branching will have the lowest boiling point. tert-butyl alcohol has the most branched structure, therefore, it has the lowest boiling point.
How do you know which compound has a higher boiling point?
In general, larger molecules have higher boiling points than smaller molecules of the same kind, indicating that dispersion forces increase with mass, number of electrons, number of atoms or some combination thereof.
What increases boiling point?
Compounds that can hydrogen bond will have higher boiling points than compounds that can only interact through London dispersion forces. An additional consideration for boiling points involves the vapor pressure and volatility of the compound. Typically, the more volatile a compound is, the lower its boiling point.
What are the strongest to weakest intermolecular forces?
Intermolecular forces In the order of weakest to strongest:
- dispersion force.
- Dipole-dipole force.
- Hydrogen bond.
- Ion-dipole force.
What is considered a high boiling point?
At sea level, water boils at 100° C (212° F). At higher altitudes the temperature of the boiling point is lower. See also vaporization.
Why does boiling point increase with solute?
A solvent’s vapor pressure will lower when a solute is added. This happens because of the displacement of solvent molecules by the solute. For the vapor pressure to equal the atmospheric pressure, a higher temperature is required, and a higher boiling point is observed. …
Which substance has the highest melting and boiling points?
The chemical element with the highest melting point is tungsten, at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as electrical filaments in incandescent lamps.