Kisik je najpogostejši element na zemlji, prisoten v zraku, vodi in v obliki raznih mineralov in rud, s preko 50% deležem. Spajanje s kisikom je bistveni del procesa dihanja, gnitja, trohnenja in korozije. Te reakcije s skupnim imenom imenujemo oksidacija. Uporablja se za varjenje in rezanje kovin, za dihalne aparate, za pogon raket, v medicini, za mnoge procese v železarski in kemijski tehnologiji.
Najpomembnejši industrijski način pridobivanja kisika je frakcionirana destilacija utekočinjenega zraka, kjer na osnovi Joule-Thomsonovega efekta utekočinimo zrak in nato s frakcionirano destilacijo ločimo kisik in dušik na osnovi razlike v vreliščih.
Po uspešnem reševanju boste razumeli:
- odvisnost rib od nmv in temperature,
- zakaj lahko uspešno dajemo umetno dihanje,
- zakaj ogenj v prostoru ugasne, ko pa še lahko dihamo,
- zakaj ogenj na velikih višinah gori, dihanje pa je otežkočeno,
- zakaj potapljač v globini lahko diha smrtno nizko koncentracijo.
Vaša naloga je rešiti vprašanja:
1. Kolikšen je % kisika v masi zraka?
2. Kolikšna je maksimalna količina (mg/l) raztopljenega kisika v vodi pri 0m nmv in 20°C?
3. Kolikšna je maksimalna količina (mg/l) raztopljenega kisika v vodi pri 2864m nmv in 20°C?
4. Kolikšna je najnižja še vedno varna količina (mg/l) raztopljenega kisika v vodi za ribe?
5. Pri kateri koncentraciji (%) kisika ugasne vžigalica?
6. Kolikšna je koncentracija (%) kisika izdiha iz pljuč?
7. Od katere vrednosti (vključno) navzdol je koncentracija (%) kisika smrtna?
8. S kakšno koncentracijo kisika (%) bi morala biti polnjena jeklenka, da bi potapljač na 100m globine morja dihal kot na morski gladini?
9. Izračunaj ekvivalent koncentracije kisika (%) na morski gladini, kot je pri dihanju na Triglavu.
10. Izračunaj ekvivalent koncentracije kisika (%) na morski gladini, kot je pri dihanju na Mount Everestu.
Rezultate z decimalkami zaokrožite.
Vseh 10 števil kvadrirajte in nato seštejte, dobite število XYZW.
Število XYZW kvadrirajte in dobite število ABCDEFG.
Zaklad poiščite na koordinatah:
N46°2(3*A-A/2).(C)(C+D-B)(G)
E014°0(2*A-A/2).(D*F)(G-E)(C-G)
Oxygen is the most abundant element on earth, present is in air, water and in the form of various minerals and ores, with over 50%. Oxygenation is essential part in the process of breathing, rotting and corrosion. These reactions with the common name is called oxidation. It is used for welding and cutting, for breathing apparatus, for the propulsion of rockets, in medicine, for many processes in the iron and chemical technology.
The most important industrial method of obtaining oxygen is fractional distillation of liquefied air, which is based on the Joule-Thomson effect in liquefied air and then separated by fractional distillation of oxygenand and nitrogen on the basis of differences in boiling point.
After a successful resolution will understand:
- Fish dependence from the altitude and temperature,
- Why can we successful give artificial respiration,
- Why the fire is extinguished in the room when you still can breathe
- Why fire burns at high altitudes, breathing is labored,
- Why the diver at a depth can breathe death low concentration.
Your task is to resolve questions:
1. What is the % of oxygen in mass of the air?
2. What is the maximum amount (mg / l) of dissolved oxygen in water at 0m altitude and at 20 ° C?
3. What is the maximum amount (mg / l) of dissolved oxygen in water at 2864 m and at 20 ° C?
4. What's the lowest still safe (mg / l) of dissolved oxygen for fish?
5. In which concentration (%) oxygen extinguished a match?
6. What is the concentration (%) oxygen expiratory from the lungs?
7. At what value (inclusive) down the oxygen concentration (%) is deadly?
8. What kind of oxygen concentration (%) should be filled in to cylinder that the diver at a depth sea of 100m can breath like at sea level?
9. Calculate the equivalent oxygen concentration (%) at sea level, as is breathing on Mount Triglav.
10. Calculate the equivalent oxygen concentration (%) at sea level, as is breathing on Mount Everest.
Round the decimal results.
Square all 10 numbers and then sum them up. You get number XYZW.
Square number XYZW and you get the number ABCDEFG.
Find a treasure at the coordinates:
N46°2(3*A-A/2).(C)(C+D-B)(G)
E014°0(2*A-A/2).(D*F)(G-E)(C-G)
VIDEO: KISIKARNA JESENICE
