Innehållsförteckning
Vad händer när järn och syre reagerar med varandra?
Rost bildas när metallen järn kommer i kontakt med fuktig luft eller vatten. Det sker en kemisk reaktion där syre oxiderar järnet. Samtidigt transporteras elektroner i metallen och joner i vattnet för att utjämna den spänningsskillnad som uppstår när elektroner avges på en plats och tas upp på en annan.
Hur skapar man järnoxid?
Vid förbränningen reagerar järnet med syret och bildar en järnoxid, Fe2O3. Reaktionsformlen är 4 Fe(s) + 3 O2 → 2 Fe2O3. Järnet har oxiderats till trevärt järn, Fe3+. Samtidigt har syret reducerats till oxidjoner, O2-.
Who are the Finns?
Finns or Finnish people ( Finnish: suomalaiset) are a Baltic Finnic ethnic group native to Finland. Finns are traditionally divided into smaller regional groups that span several countries adjacent to Finland, both those who are native to these countries as well as those who have resettled.
Did the Finns practice slash and burn agriculture?
Slash-and-burn agriculture was practiced in the forest-covered east by Eastern Finns up to the 19th century. Agriculture, along with the language, distinguishes Finns from the Sami, who retained the hunter-gatherer lifestyle longer and moved to coastal fishing and reindeer herding.
How does Finns alias work?
Obtain your own, unique permanent email address such as [email protected]. How it works: Your Finns.org Alias is an automatic email redirecting service. You provide us with [email protected] and what email account you want it to point to (any email account that you currently use).
What is the variation in Finnish fixation index (f St) values?
Variation within Finns is, according to fixation index (F ST) values, greater than anywhere else in Europe. Greatest intra-Finnish F ST distance is found about 60, greatest intra-Swedish F ST distance about 25. F ST distances between for example Germans, French and Hungarians is only 10, and between Estonians,…