Properties Based on Polarity/Shape Flashcards
When the polarity is bigger, is the intermolecular force between the atoms bigger or smaller?
The intermolecular force is bigger.
What properties do intermolecular forces/bonding affect for covalent bonds?
MP, BP, VP and Solubility
What is MP?
Melting point is the temperature when a solid turns to liquid. (MP of ice is 0C)
What is BP?
Boiling point is when the liquid turns to gas. (BP of water is 100C)
When the KE (temp) of the molecules is increased, what happens to the intermolecular forces?
The intermolecular forces/bonds will become weaker since the molecules will be able to break free easier.
When the intermolecular forces are higher, is more or less energy needed for MP and BP?
Higher energy is needed.
Will methane (CH4) or water (H20) have a lower MP?
Methane will have a lower MP since it is non-polar and has dispersion force which is weak and easier to break compared to hydrogen bonding and dipolep-dipole from the water.
What is vapour pressure?
Vapour pressure is the pressure of a vapour in contact with its solid or liquid form.
When a molecule has high kinetic energy, is more or less likely to evaporate?
It is more likely.
Are weak or strong intermolecular forces more like to evaporate?
Weak intermolecular force like dispersion forces are more likely to evaporate.
What substance is a volatile substance?
A volatile substance is one that is more likely to readily vaporise.
Why is a substance volatile?
A substance is volatile because it has more molecules going into the gas phase which lets out a higher vapour pressure. (More molecules in gas phase, higher pressure).
When can covalent compounds dissolve?
Covalent compounds can dissolve in solvents with similar properties. The ‘like dissolves like’ rule so polar dissolve in polar (h2o).
