Boiling Point
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Boiling Point
How can you tell which compound will have a higher boiling point? For example, between the two molecules H2S and H2Se?
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Re: Boiling Point
When comparing molecules containing bonds between the same types of atoms, you can determine which one has a higher boiling point based on the strength of its bond. Generally single bonds< double bonds< triple bonds. You can also take the size of the atoms into account when determining boiling points. As an atom gets larger, it makes weaker bonds because the central protons have less of a pull on the outer electrons involved in the bonding process.
For example; H2S, H2Se
You know that Se is a larger atom than S, and they both have 6 valence electrons, so their bonding structure with the two Hydrogens will have the same shape; however, because Se is a larger atom, it will have a weaker bond, and a lower boiling point.
Stronger bonds= higher boiling points
Weaker bonds= lower boiling points
For example; H2S, H2Se
You know that Se is a larger atom than S, and they both have 6 valence electrons, so their bonding structure with the two Hydrogens will have the same shape; however, because Se is a larger atom, it will have a weaker bond, and a lower boiling point.
Stronger bonds= higher boiling points
Weaker bonds= lower boiling points
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Re: Boiling Point
The compound with stronger electronegativity will have a higher boiling point because the intermolecular forces will be stronger.
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Re: Boiling Point
Kassidy Tran 1F wrote:How can you tell which compound will have a higher boiling point? For example, between the two molecules H2S and H2Se?
Furthermore, how can you tell which will have a higher boiling point based off of the intermolecular forces?
Re: Boiling Point
You should look at the bond length. Longer bond length means weaker bonds which can be broken with lower energy (lower boiling point). Smaller bond lengths are stronger and thus require more energy (higher boiling point).
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