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Answered 2011-05-18 02:02:13

Think relationships here... really London Dispersion Force is like an acquaintance, Dipole Dipole is like boyfriend/girlfriend and Hydrogen Bonding is like marriage. Now out of the three London dispersion is the easiest to break the bonds, Di Pole Di pole are a little harder to break up and Hydrogen bonding are the hardest to break up the bonds. Hydrogen Bonding will always have the strongest bond. London dispersion is when for a split second their is a short attraction and doesn't last long. It is very weak therefore making this non- polar. Dipole Dipole means 2 opposite sides. Positive and negative charges. This molecule is a Polar molecule. Hydrogen Bonding is a Polar molecule which attaches itself to either N,O,or F. A melting point takes a low energy to melt so the bonds are weak. the higher the boiling temperature the stronger the bonds. Think H20. Melting is comparing how hard it is to separate the molecules. Same Concept. Ex.1.) CH4 / LiCl

CH4 more soluable / LiCl low soluability

CH4 low melting point / LiCL higher melting point

CH4 low boiling point/ LiCL Higher boiling point

CH4 London Dispersion / LiCl Dipole Dipole

Example2: H2O / NaCl

H2O high boiling point/ NaCl lower boiling point

H2O Hydrogen bonding/ NaCl Dipole Dipol

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Weak dipole-dipole forces result in a low melting and boiling point .

Dipoles are a form of intermolecular force which holds molecules together. The greater the intermolecular force, usually the greater the boiling point, for example.

Melting and boiling points are determined by the strength of the intermolecular forces present in the compound. The stronger the intermolecular forces, the higher the melting and boiling points. There are four types of intermolecular forces, from lowest strength to highest: London dispersion forces, dipole-dipole, hydrogen bonding, and ion-dipole. Ionic compounds will have ion-dipole intermolecular forces. Because this is the strongest intermolecular force, ionic compounds will also have the highest melting and boiling points.

The stronger the bonds between molecules; the higher the melting/boiling points. This makes sense if you think about it, melting/boiling is splitting up the molecules - the stronger they are bonded the more energy you will need

There are basically two types of bonding in substances that affect the boiling point. Some compounds are composed of extensive networks of atoms held together by either ionic or covalent bonds. These network substances have very high melting and boiling points. NaCl is an example of an ionic network and SiO2 is an example of a covalent network. The key factors that affect the boiling points of molecular compounds are the intermolecular forces which attract one molecule to another. For covalent compounds these intermolecular forces are called van der Waals forces and consist of hydrogen bonding, dipole-dipole attraction, and London dispersion forces. Hydrogen bonding is usually stronger than dipole-dipole interactions. London dispersion forces, often weaker forces, are found between all molecules, even if other van der Waals forces are present. The boiling point of a solution is also affected by the ambient pressure. Boiling occurs at a temperature where the vapor pressure of the liquid is equal to the ambient pressure. The third thing that affects the boiling point of a solution is any substance that is dissolved in the liquid. The more particles (ions or molecules) there are dissolved in the solution, the higher the boiling point.

The melting and boiling point of a substance is largely determine by the intermolecular forces which hold its molecules together. These may included Van der Waals forces (dispersion forces), dipole-dipole interactions, as well as hydrogen bonding. The stronger these forces act between molecules, the high the melting point and boiling point of the substance.

A more polar molecule will have a higher melting point. A polar molecule will have a strong dipole-dipole bond and will require more energy to break that bond.

SO2; SO2 has a larger molecular mass than CO2. The most important factor in determining the boiling point, is the intermolecular forces involved. SO2 is a polar molecule with dipole dipole forces. CO2 is a nonpolar molecule, thus having dispersion (London) forces. Dispersion forces are the weakest intermolecular forces so dipole-dipole forces are much stronger. Dipole-dipole forces have a higher melting point because more heat is needed to break it down.

SO2 has a higher boiling pt because it has a greater molecular mass, SO2 is a pola r molecule which forms dipole-dipole forces which increases the boiling point

HI has a higher boiling point because of the dipole-dipole Intermolecular forces as well as the dispersion forces, which become more evident with molecular weight, which will dominate over the dipole-dipole forces, so HCl has a lower boiloing point.

Iodine monochloride (ICl) has the higher boiling point mainly because of dipole-dipole interactions between the molecules that Br2 lacks.

if you put an ionic compound in a polar substance it will raise the boiling point because the resulting ion dipole bonds will be stronger than the previously existing dipole dipole bonds

Lower. CH3CN is polar and has a dipole-dipole attraction.

They are weaker as compared to the ionic bonds. Since Ionic bonding takes place when one element loses an electron and another gains it. Due to this ionic compounds are stronger and have high melting and boiling points.

Solids are held together but different types of intermolecular forces. The nature of these forces depends on the compound. In nonpolar substances, only dispersion forces at work. In polar compounds, dipole-dipole forces also hold the molecules together. Since dipole-dipole forces are stronger than dispersion forces, polar compounds usually have a higher melting point than nonpolar ones.

the more polar the molecule, the stronger the dipole-dipole force. Since this force is stronger, the atoms are held closely together, so it is harder for photons (in this case heat energy) to break up the molecule, causing boiling.

Ammonia (NH3) has hydrogen bonding intermolecular forces, whereas methane (CH4) does not. In addition, ammonia is polar, and so also has dipole-dipole forces and methane does not. Thus, it takes more energy (higher temperature) to boil and melt ammonia than it does methane.

It can be atoms or molecules moving in liquids. This occurs when the forces of attraction between the atoms/molecules are weak enough to melt from a solid but strong enough to prevent it from reaching a gaseous state. This depends on the substances intermolecular forces i.e. Dipole-dipole or Hydrogen Bonds, and/or London forces. Melting and boiling points depend on the strength of these forces. For us, boiling is always thought of as 100 C, because water is a common substance. But Neon for example, BOILS at -269 C, because the only forces present are London forces, which are extremely weak.

London and dipole forces are intermolecular forces or forces that hold separate molecules together. The stronger the forces the more energy that is required to separate the molecules which is what happens when you change phase from a liquid to a gas. To supply more energy, higher temperatures are required. So, stronger forces cause higher boiling points. London forces tend to increase with increasing molecular weight but if dipole forces are present they will dominate the interaction since dipole forces are stronger than London forces.

Molecules with dipoles have higher boiling points because they are able to form strong dipole-dipole interactions with other molecules. Alkanes are nonpolar and only have weak London dispersion forces, thus lower boiling points.

Entirely different things affect the melting points of covalent compounds and ionic compounds. The melting points of covalent compounds are affected by which intermolecular force affects it and how strong they are: The intermolecular forces are: London forces, dipole to diploe forces and hydrogen bonding. Which ones are happening depends on the molecule. You'll have to research each force to understand how it works. For ionic compounds it is due to charge density of either the anion or the cation: which is the relative charge/ionic radii. A greater charge density means a higher boiling point.

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