This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.

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Huu hapa ni ufumbuzi wa swali la 13:
13 (a): Oksijeni hupatikana kutoka hewani kwa kiwango kikubwa kupitia mchakato wa distillation sehemu ya hewa iliyoyeyushwa. Hewa husafishwa kwanza ili kuondoa vumbi, kaboni dioksidi na mvuke wa maji. Kisha hupozwa hadi kuyeyuka, na kisha hupashwa moto polepole. Oksijeni hutenganishwa na nitrojeni kwa sababu zina viwango tofauti vya kuchemka.
13 (b) (i): Substance A ni asidi ya salfa (VI) iliyokolea.
13 (b) (ii): Mlinganyo wa mchakato unaofanyika katika chumba cha ufyonzaji ni:
13 (c) (i): Kichocheo kingine kinachoweza kutumika katika mchakato huu ni Platini.
13 (c) (ii): Sababu mbili kwa nini vanadiamu (V) oksidi hutumika sana kama kichocheo ni: • Ni nafuu kuliko platinamu. • Ni vigumu zaidi kuharibika na uchafu, hivyo inahitaji hewa safi kidogo.
13 (d): Uonaji: Fuwele za shaba (II) salfati hubadilika kutoka bluu na kuwa nyeupe. Maelezo: Asidi ya salfa (VI) iliyokolea ni wakala hodari wa kukausha. Huondoa maji ya fuwele kutoka kwa shaba (II) salfati hidrati (bluu), na kuacha shaba (II) salfati isiyo na maji (nyeupe).
13 (e): Sifa ya asidi ya salfa (VI) iliyokolea inayoonyeshwa katika mmenyuko huu ni kwamba ni asidi isiyoyeyuka. Huondoa asidi tete (kama vile hidrojeni kloridi) kutoka kwa chumvi zake.
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Huu hapa ni ufumbuzi wa swali la 13: 13 (a): Oksijeni hupatikana kutoka hewani kwa kiwango kikubwa kupitia mchakato wa distillation sehemu ya hewa iliyoyeyushwa.
This chemistry question involves key chemical concepts and calculations. The detailed solution below walks through each step, from identifying the reaction type to computing the final answer.