Methanol will float on glycerine.
You would use the density difference to separate the sand, evaporate the water out (the water vapor will cool back to water if collected). Then use a magnet to get the iron fillings out of the salt.
Hydrogen bond is your answer. Be careful with covalent bonds! The force within a molecule between hydrogen and fluorine, nitrogen, or oxygen may be a covalent bond, but the problem said "intermolecular forces," in which a covalent bond is not a type of force.
The new pressure changed relative to the original by a factor of 8/3.
<h3>What is the change in the pressure?</h3>
Using the ideal gas equation;
PV = nRT
P = pressure
V = volume
n = number of moles
R = gas constant
T = temperature
P1 = nRT/V
P2 = 4n * R * 2T/3V
Hence;
P2/P1 = 4n * R * 2T/3V ÷ nRT/V
P2/P1 = 4n * R * 2T/3V * V/nRT
P2/P1 =4 * 2/3
= 8/3
Learn more about ideal gas law:brainly.com/question/13821925
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