It has to do with how strongly the molecules interact with each other. The ordering from lowest to highest boiling point is therefore C 2 H 6 < C 3 H 8 < C 4 H 10 . Weak. B.) H2Te has the highest molecular weight and thus it has the highest boiling point from H2S and H2Se. All of these compounds are nonpolar and only have London dispersion forces: the larger the molecule, the larger the dispersion forces and the higher the boiling point. A substance with a high boiling point has strong or weak intermolecular forces? High Vapour Pressure - Weak, because the stronger the forces between molecules the less molecules vapourizing into the atmosphere. High boiling point - Strong, because the greater the forces between molecules the harder it is to boil a molecule. The stronger the intermolecular forces between the molecules of a liquid, the greater the energy required to separate the molecules and turn them into gas à higher boiling point Trends: 1. Which means that each carbon atom is covalently bonded to four other carbon atoms. A.) ionic compounds have high melting points because the have strong intermolecular forces. A substance with a high vapor pressure has strong or weak molecular forces? More carbons means a greater surface area possible for hydrophobic interaction, and thus higher boiling points. first of all a diamond is a giant 3D convalently structured network. Intermolecular Forces, Boiling and Melting Points The molecule is the smallest observable group of uniquely bonded atoms that represent the composition, configuration and characteristics of a pure compound. This is a bit of a simplification but you can think of the different states of matter as existing on a spectrum - with solids being on one end, liquids occupying the middle, and gases at the far end. What are the intermolecular forces? and negligible or weak intermolecular forces. Higher melting and boiling points signify stronger noncovalent intermolecular forces. ... will you have a higher or lower boiling point? due to its 3D structure and its 4 covalent bonds between each carbon gives it its extremely high melting and boiling points and also its extreme hardness. Why do different liquids boil at different temperatures? Because of this, comparatively weak intermolecular forces exist for H2S and the melting and boiling points are much lower than they are in water. As the intermolecular attraction increases, • The vapor pressure ( the pressure of the vapor that is in equilibrium with its liquid) decreases • The boiling point ( the temperature at which the vapor pressure becomes equal to the pressure exerted on the surface of the liquid) increases also the bonds between the carbon atoms are referred to … O, N, F. Hydrogen bonds have to be connected with these elements to be considered a hydrogen bond. They are listed in the table below along with covalent and ionic bonding for comparison. This ties is directly to the vapour pressure of a compound. Molecular compounds boiling point is lower however because they have less strong intermolecular forces. This ties is directly to the vapour pressure of a compound. Our chief focus up to this point has been to discover and describe the ways in which atoms bond together to form molecules. Consider the boiling points of increasingly larger hydrocarbons. High boiling point - Strong, because the greater the forces between molecules the harder it is to boil a molecule. Notice that they have different dependence on the distance between the attracting particles, r. Materials dissolve in a solution when there are strong intermolecular forces between the solute and the solvent. 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