May 12, 2015 … The favoured excitation maximum of PpIX at 635 nm for PDT corresponds to a 1.95 eV bandgap that falls in a window that can be readily achieved at low cost with aluminium gallium arsenide, gallium arsenide phosphide or other standard semiconductor materials for LED fabrication. For therapeutic …
Mar 7, 2013 … Chemistry (4CH0) Paper 2C. Edexcel Level 1/Level 2 … M2 dependent on M1 or near miss, e.g. Ca(OH)2(s). IGNORE references to … Acid used. Metal compound . Name Solid or aqueous solution sulfuric (acid) solid silver nitrate nitric (acid) solid/ aqueous/ solution correct formulae silver ethanoate. 5.
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Jan 28, 2012 … Mark Scheme (Results). January 2012. international gcse chemistry (4CH0). Paper 2C … 3 (a) (i). (ii). (iii) any named soluble metal sulfate / ammonium sulfate / (dilute) sulfuric acid correct formulae for all compounds. (mark consequentially on the sulfate given in. (a)(i), even if insoluble, except lead(II) …
Aug 23, 2012 … International GCSE. Chemistry (4CH0) Paper 2C. Edexcel Level 1/Level 2 Certificate … INTERNATIONAL GCSE CHEMISTRY PAPER 2C – SUMMER 2012 . Question number. answer. notes. marks. 1 a (i) M. 1 … aluminium/it is more reactive than iron/carbon. OR above iron/carbon in reactivity series. OR.
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