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If by why, you mean when, than it's formed when metals react with oxygen.
For example... (underscore_ signifies subscript, sorry I don't know how to use it.)
2Na + O_2 -> Na_2O_2
which is a peroxide
K + O_2 -> KO_2
which is a super peroxide
Hope I helped!
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∙ 14y ago
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Which of these is formed by combining oxygen with metals?
oxides
Which gas is produced by power station?
Carbon dioxide, water, nitrogen oxides, sulfur oxides, ashes formed from the oxides of other elements.
What is the General formulae for group 1 metal oxides?
There is no single answer to this question as different group one metals form different oxides. We would expect group one elements to form M2O oxides but in fact only lithium does this when burnt. The other elements more easily lose electrons from their second outermost shell so can form peroxides M2O2, superoxides MO2 or even higher oxidation state oxides. For example Caesium can form Cs7O.
What compounds are formed when group 7 elements react with the air?
Metallic oxides
If calcium reacts with oxygen is the oxide formed an acid or base?
Calcium oxide is definitely a base forming oxide, only nonmetals can have acidic oxides, though some other metal (amphoteric) oxides are also (mainly weak) acid forming oxides.
What is the ionic charge of O?
O2- in oxides, O1- in peroxides
What atom can form oxides peroxides and superoxides when it reacts with oxygen?
This element is sodium and the oxides are: Na2O, Na2O2, NaO2.
What are elements that use oxygen in their chemical formula?
All oxides, peroxides, superoxides, ozonides and compounds with oxy-anions have oxygen atoms in them.
What type of oxides are formed by chemicals?
All the types of oxides !
What is the difference between oxide and super oxide?
normal oxides of metals have general formula M3O. & super oxides have general formula MO2. super oxides are coloured & paramagnetic in nature due to presence of unpaired electrons.on moving down side the group tendency to form super oxides increases.& that of normal oxides decreases. oxides of metals on dissolving in water form their hydroxides only.while super oxides form hydroxides with the release of H2O2 & H2.
What is the charge on manganese in the formula MnO?
+2, because in (normal) oxides O is always -2, in peroxides -1 (-O-O-)
What type of oxides are formed when metals combine with oxygen?
acidic oxides
What type of oxides are formed when non metals combine with oxygen?
acidic oxides
What products are formed after a combustion?
Oxides.
Which of these is formed by combining oxygen with metals?
oxides
What is formed when combining oxygen with metals?
Metal oxides
What is formed when an element is burned in air or oxygen?
Compounds that are formed when elements are chemically combined with oxygen are generally categorized as oxides.
