DISCUSSION ON INTERMOLECULAR FORCES & METALLIC BOND

 INTERMOLECULAR FORCES

In answering question of IMF, make sure understand about POLARITY OF THE MOLECULES

- if the molecules is 

a) NON POLAR , thus its IMF is LONDON DISPERSION FORCES

b) POLAR , thus its IMF is DIPOLE-DIPOLE FORCES or HYDROGEN BOND

1. What type of intermolecular forces are due to the attraction between temporary dipoles and their induced temporary dipoles?

* If this kind of question, please understand the definition of each type of INTERMOLECULAR FORCES. 

Keypoints: attraction between temporary dipoles and their induced temporary dipoles

ANSWER:

LONDON DISPERSION FORCES 

⇰because LONDON DISPERSION FORCES is a force of attraction between *instantaneous(temporary) dipole* that arise from a short time scale fluctuation in the electronic structure of species when they become very close to one another (induced temporary dipoles).

2. What type of interparticle forces holds liquid N₂ together?

* INTERPARTICLE = INTERMOLECULAR 

BUT Interparticle always used when involves simple molecules

Liquid N_{2   is NONPOLAR}

ANSWER: 

N_{2 has LONDON DISPERSION FORCES}

_3. Which   of   the   following   will   have   hydrogen   bonding? 

    H3CCH2CH2OH     CH3CH2OCH3        CH3CH2NH2           CH3CH2SH  

    

                            STRUCTURE 1 : Molecules have Hydrogen bond between its                                                                         molecules

                            STRUCTURE 2 : Molecules have Hydrogen bond between its                                                                         molecules

                            STRUCTURE 3 : Molecules do not have Hydrogen bond between its                                                             molecules 

                            STRUCTURE 4 : Molecules do not have Hydrogen bond between its                                                             molecules 

ANSWER: H3CCH2CH2OH and CH3CH2NH2  

4. Which of the molecules has higher boiling point, CH3CH2OH or CH3OCH3 ?

Both molecules have molecular weight = 46g/mol

But they have difference intermolecular forces among its own molecules.

CH3CH2OH  has hydrogen bond between its molecules but CH3OCH3 has dipole-dipole forces between its molecules

Thus, CH3CH2OH has higher boiling point than CH3OCH3     

ANSWER: CH3CH2OH

METALLIC BOND

1.  Describe   the   structure   of   a   metal. 

Explanation on the structure in ELECTRON SEA MODEL

ANSWER: 

Giant   structure   of   atoms  arranged   in   an array pattern

2.  Describe   the   position   of   electrons  in   a   metal. 

Explanation must highlight on the DELOCALIZED OF ELECTRONS

ANSWER:

The electron delocalized around the metal ion

3. Draw   a   diagram   to   represent   a   metal,  representing   the   electrons   and   the   respective   charges.  

Explanation based on the structure in ELECTRON SEA MODEL. Give any example of metal element

ANSWER:

4. What   are   the   structural   differences   between   a   pure   metal   and   an   alloy? 

ANSWER:  

 A   pure   metal   contains   atoms   of  the   same   metal   whereas   an   alloy   is   compiled   of   different   metal  atoms.

 In   pure   metals,  the   atoms   are   arranged   in   layers   /  alloys   have   distorted   layers.  

5. Fill in the box with correct answer

ANSWER:

*This post just to share the idea on variety of questions in the IMF & Metallic bond.

Please give some comment on roughly idea of IMF & Metallic Bond in the COMMENT POST as I can know your presence in reading this post. TQ.