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when talking about melting and boiling points...this ones tough Watch

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    how do you know whether to talk about the bonds or the intermollecular forces....because at school ive learnt that sometimes its the bonds and sometimes its the intermollcular forces that affect melting and boiling points.... as in how they break

    bond example? giant covalent bond

    so help me out? in an exam how do i figure out whether to talk about the bonds or intermollecular forces?
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    melting and boiling points are simply interconversion of states, no bonds are broken or created. It is not a reaction, it is a process.
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    Giant Structure - Intermolecular
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    simple molecules= LOW MELTING AND BOILING POINTS, due to the WEAK VAN DER WAALS FORCES, this makes it easier to break the bonds,

    ionic compounds= held in giant ionic structure with STRONG ATTRACTION HOLDING THE OPPOSITLEY CHARGED IONS, making it harder to break the bonds.

    metallic bonding= GIANT METALLIC STRUCTURE with posotive ions surrounded by a sea of delocallised electrons, high mpt and bpt due the the strong attraction.. i thinkso. HIGHER CHARGE = HIGHER MPT AND BPT

    covalent= strong covalent bons holding molcules together, lots of energy needed t break bons. learn diamong and graphite
 
 
 
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