Permanent dipole-dipole attractions?
(1) From the list below, state the molecules in which, when liquid, permanent dipole-dipole attractions are present in addition to London forces.
(a) Hydrogen (H2)
(b) Ethanal (CHsCHO)
(c) Hydrogen fluoride (HF)
(d) Methane (CH1)
(3) This question compares butanone and 2-methyl butane.
(a) How many electrons are there in a molecule of (i) butanone (ii) 2-methylbutane? (b) Taking only London forces into account, which of these two molecules would you expect to have the higher boiling point? Use your answer to part (a) to explain this.
(c) Explain the actual order of boiling points as shown in the table. In order to help your answer, draw a diagram of the two molecules, showing any dipoles and labelling atoms with partial charges (8+ and 8-) where needed. (4) Describe an experiment that would enable you to decide whether a liquid is made up of polar molecules
(a) Hydrogen (H2)
(b) Ethanal (CHsCHO)
(c) Hydrogen fluoride (HF)
(d) Methane (CH1)
(3) This question compares butanone and 2-methyl butane.
(a) How many electrons are there in a molecule of (i) butanone (ii) 2-methylbutane? (b) Taking only London forces into account, which of these two molecules would you expect to have the higher boiling point? Use your answer to part (a) to explain this.
(c) Explain the actual order of boiling points as shown in the table. In order to help your answer, draw a diagram of the two molecules, showing any dipoles and labelling atoms with partial charges (8+ and 8-) where needed. (4) Describe an experiment that would enable you to decide whether a liquid is made up of polar molecules
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Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there. 1. Permanent dipole dipole (pdd) attractions occur in polar molecules
3.
(a) Number of electrons is found.
(b) The one having higher number of electrons has higher bp.
(c) Consider London forces, pdd forces and hydrogen bonds.
4. Use a charged rod to see if the liquid is deflected
3.
(a) Number of electrons is found.
(b) The one having higher number of electrons has higher bp.
(c) Consider London forces, pdd forces and hydrogen bonds.
4. Use a charged rod to see if the liquid is deflected
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