owais_148
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hi, I have a question regarding the first ionisation energy and 2nd energy ionisation definition, so basically in a small mini test i wrote the 1st ionisation energy definition as ' the first ionisation energy is the enthalpy change when mole of gaseous 1+ ions is formed from gaseous atoms. ( got the mark for this definition). now here is where the problem comes in, for the second ionisation energy I wrote ' the second ionisation energy is the enthalpy change when one mole of gaseous 2+ ions is formed from one mole of gaseous 1+ ions. I did not get the mark for this question?? and the same exact word to word definition is stated on the cgp revision guide?? then I ask my teacher and she says that the revision guide is wrong despite the 1st ionisation energy definition being right and the second being wrong? does anyone know what's going on?
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sambridge
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(Original post by owais_148)
hi, I have a question regarding the first ionisation energy and 2nd energy ionisation definition, so basically in a small mini test i wrote the 1st ionisation energy definition as ' the first ionisation energy is the enthalpy change when mole of gaseous 1+ ions is formed from gaseous atoms. ( got the mark for this definition). now here is where the problem comes in, for the second ionisation energy I wrote ' the second ionisation energy is the enthalpy change when one mole of gaseous 2+ ions is formed from one mole of gaseous 1+ ions. I did not get the mark for this question?? and the same exact word to word definition is stated on the cgp revision guide?? then I ask my teacher and she says that the revision guide is wrong despite the 1st ionisation energy definition being right and the second being wrong? does anyone know what's going on?
The definition for the 2nd ionisation energy is ''the enthalpy change /energy required when 1mol of electrons are removed from 1 mol of gaseous 1+ ions to form 2+ ions''. Maybe you just missed the bit about removing electrons?
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owais_148
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the bit about removing the electrons is not in the cgp guide Name:  Screenshot_20190905-141943_Gallery-compressed.jpg.jpeg
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sambridge
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(Original post by owais_148)
the bit about removing the electrons is not in the cgp guide Name:  Screenshot_20190905-141943_Gallery-compressed.jpg.jpeg
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Yeah different books will have different definitions and different exam questions have different mark schemes so I wouldn't worry too much as long as you actually understand the concept.
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