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What is the percentage of oxygen in the bottled gas? Explain the observations made during the experiment.
Chemistry
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2 stepsHapa kuna majibu kwa maswali yako:
Part a· 2 steps
Ili kupata asilimia ya oksijeni katika gesi iliyohifadhiwa, tunatumia mabadiliko ya ujazo wa gesi.
Kutoka kwenye grafu:
- Ujazo wa awali wa gesi = .
- Ujazo wa gesi iliyobaki baada ya mmenyuko kukamilika (ambapo grafu inatulia) = .
Hii inamaanisha ujazo wa oksijeni iliyoondolewa ni tofauti kati ya ujazo wa awali na ujazo wa mwisho.
Tafuta ujazo wa oksijeni iliyoondolewa.
Kokotoa asilimia ya oksijeni.
Asilimia ya oksijeni katika gesi iliyohifadhiwa ni
\boxed{\text{21%}}.
Part b
Ufafanuzi wa uchunguzi uliofanywa wakati wa jaribio
- Kupungua kwa ujazo wa gesi: Oksijeni katika mchanganyiko wa gesi humenyuka na shaba moto na kutengeneza oksidi ya shaba(II) imara. Kwa kuwa oksijeni huondolewa kutoka awamu ya gesi, ujazo wa jumla wa gesi hupungua.
- Mabadiliko ya rangi ya shaba: Shaba (yenye rangi ya kahawia-nyekundu) humenyuka na oksijeni na kutengeneza oksidi ya shaba(II) (CuO), ambayo ina rangi nyeusi. Hii husababisha vipande vya shaba kubadilika rangi na kuwa nyeusi.
- Kutulia kwa ujazo wa gesi: Ujazo wa gesi huacha kupungua wakati oksijeni yote imemenyuka. Gesi iliyobaki, hasa nitrojeni, haimenyuki chini ya hali hizi.
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