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Explain whether phosphine or ammonia has a higher boiling point

Background knowledge Boiling point reflects the strength of intermolecular forces. The more attracted molecules are to each other, the more energy is needed to separate them and turn them into gases. Three m...
JP
Answered by Jadwiga P. • Chemistry tutor
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how can you identify a chiral carbon in a molecule?

A chiral carbon is a carbon atom that is attached to 4 different types of atoms or groups of atoms.
NH
Answered by Naomi H. • Chemistry tutor
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List the following compounds in order of increasing acidity in aqueous solution, giving reasons for your choices: HCl, HI, HBr, HF.

The acidity of a compound is measured by its pKa, which is defined as: pKa=-log([H + ]) ([H + ] is the concentration of H + in solution). As [H + ] increases, pKa decreases, meaning strong acids have low pKa...
PS
Answered by Promeet S. • Chemistry tutor
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Why is the molecule CH4 tetrahedral whereas NH3 is not?

By the VSEPR (Valence shell electron pairs repulsions) theory, even though there are four electron pairs on C and N, the presence of a lone pair of electrons on N increases the repulsions, meaning that the N...
PL
Answered by Paula L. • Chemistry tutor
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Describe how σ and π bonds form.

Sigma bonds form as a result of end on overlap of orbitals (pp, ss or sp) along the axis between two atoms' nuclei. Pi bonds form because of parallel overlap between p orbitals. A sigma bond forms a single b...
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Answered by Eloise J. • Chemistry tutor
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