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With a bigger size there are stronger London forces. London forces are also known as Dispersion forces and van der Waal forces. These forces become stronger as the size of the molecule increases.
Butane, C4H10, is a gas with a relative size of 58 and a boiling point of ~ -1 ºC. Octane, C8H18, is a liquid with a relative size of 114 and a boiling point of 125 ºC. The two molecules differ in size only but as octane is bigger it has a higher boiling point due to the dispersion forces.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoFor molecules of similar polarity, larger molecular masses would equate to higher boiling points. This is because molecules with larger masses would have stronger intermolecular van der Waals forces.
Wiki User
∙ 12y agoyes, they have more London dispersion forces and therefore have a higher boiling point
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How does the size of and number of atoms contained in a hydrocarbon affect its properties?
As the base number of carbon atoms in a simple hydrocarbon increases, the higher the potential energy contained in the compound. More complex hydrocarbons can also have shifting melting and boiling ranges.
Does a large covalent molecule generally have a low boiling point?
Boiling point of a molecular substance depends on the intermolecular forces - forces that attracts a molecule to its neighbours of the same kind.For a covalent molecule, the possible intermolecular forces aredispersion forcesdipole-dipole bonding andhydrogen bondingAs the strength and magnitude of the intermolecular forces increase, the boiling point increases because it becomes increasingly difficult to break the bonds and requires more energy for the same.Since different types of intermolecular bonding are present, the answer to the question cannot be given in a single sentence.Analyzing all types:If, for large covalent molecules, the intermolecular forces increase, then the boiling point will increase.If only dispersion forces are present, then as the number of electrons increases (and consequently the mass), so will the dispersion forces. Therefore, boiling points will be higher.If only dipole-dipole bonding is present, then, as the molecule increases in size, the charge is dispersed in the molecule, strength of the polarity decreases and thus the intermolecular forces decreases. Therefore, boiling point decreases.If only hydrogen bonding were present, the strength of the bond will depend on the halogen atom with which hydrogen forms a bond. It does not depend on the mass/size of the molecule.However, dipole-dipole and hydrogen bonding can never exist in a substance on their own but with dispersion forces.Therefore, as the mass/size of a covalent molecule increases, the dispersion forces increase and will lead to a higher boiling point independent of hydrogen bonding and the decrease in dipole-dipole bonding will be compensated by an equal or higher increase in dispersion forces.Large covalent molecules do not have low boiling points (in comparison with small covalent molecules). But boiling point of covalent molecules, in general, is less than that of ionic molecules.
How does molecule size affect melting point?
Intermolecular forces increase as molecular size increases, thus the bigger the molecular size, the bigger the molecular mass, the stronger the intermolecular forces, the more energy required to break the bonds between the molecule, thus a higher melting/boling point.
Why does hydrogen sulfide have a low boiling point?
It doesn't have hydrogen bonding, which results in less intermolecular attractions and therefore a lower boiling point.
What factors affect bond angle of a molecule?
Type of hybridizationthe number of lone pairs and bond pairs
How does the size of and number of atoms contained in a hydrocarbon affect its properties?
As the base number of carbon atoms in a simple hydrocarbon increases, the higher the potential energy contained in the compound. More complex hydrocarbons can also have shifting melting and boiling ranges.
How does molecule size change of ozone layer affect the earth?
Molecule size changes of the ozone. When it is being depleted the most.
What is the connection between the size of the molecules in crude oil and their condensing or boiling point's?
Smaller molecules have a lower boiling point, and larger molecules have a higher boiling point. Source: Learnt this in class today.
Can Filtration can be used to separate mixtures based on their boiling point?
It is not possible; filtration as a separating method is based on the difference between boiling points.
Does a large covalent molecule generally have a low boiling point?
Boiling point of a molecular substance depends on the intermolecular forces - forces that attracts a molecule to its neighbours of the same kind.For a covalent molecule, the possible intermolecular forces aredispersion forcesdipole-dipole bonding andhydrogen bondingAs the strength and magnitude of the intermolecular forces increase, the boiling point increases because it becomes increasingly difficult to break the bonds and requires more energy for the same.Since different types of intermolecular bonding are present, the answer to the question cannot be given in a single sentence.Analyzing all types:If, for large covalent molecules, the intermolecular forces increase, then the boiling point will increase.If only dispersion forces are present, then as the number of electrons increases (and consequently the mass), so will the dispersion forces. Therefore, boiling points will be higher.If only dipole-dipole bonding is present, then, as the molecule increases in size, the charge is dispersed in the molecule, strength of the polarity decreases and thus the intermolecular forces decreases. Therefore, boiling point decreases.If only hydrogen bonding were present, the strength of the bond will depend on the halogen atom with which hydrogen forms a bond. It does not depend on the mass/size of the molecule.However, dipole-dipole and hydrogen bonding can never exist in a substance on their own but with dispersion forces.Therefore, as the mass/size of a covalent molecule increases, the dispersion forces increase and will lead to a higher boiling point independent of hydrogen bonding and the decrease in dipole-dipole bonding will be compensated by an equal or higher increase in dispersion forces.Large covalent molecules do not have low boiling points (in comparison with small covalent molecules). But boiling point of covalent molecules, in general, is less than that of ionic molecules.
Define the four ways to separate a mixture?
by boiling point: distillation by molecule / particle size: electrophoresis/sieve/membrane by polarity or charge: chromatography/isoelectric focussing by specific gravity: centrifugatiuon
How might the size of a molecule affect the way in which an organism obtains the nutrients in that molecules?
The size of a molecule may affect the way in which an organism obtains the nutrients because the larger the molecule you have, the more the element can hold, so that would mean that there would be more nutrients for the organism.
Name some physical properties other than boiling point that are affected by the presence of hydrogen bonds?
color, size, shape, melting pint, boiling point
Is boiling soup different then boiling just water?
Other than the obvious differences, the process of dissolving something with a lower vapor pressure (higher boiling point) into water will cause the resulting solution to have an overall lower vapor pressure and therefore a higher boiling point.
What are characteristic propertys of matter?
A few are density,color,size,texture, hardness,softness,melting point,boiling point, and freexing point.
What are size dependent and size dependent properties of matter?
hey....the size independent properties are....density, melting point, solubility, ability to attract a magnet, state of matter, color, and boiling point.
How does molecule size affect melting point?
Intermolecular forces increase as molecular size increases, thus the bigger the molecular size, the bigger the molecular mass, the stronger the intermolecular forces, the more energy required to break the bonds between the molecule, thus a higher melting/boling point.
