Design an activity to show that metals react with oxygen under different conditions
Answers
Explanation:
Burn a magnesium ribbon. We will find that the red litmus paper turns blue indicating that it is a base. Therefore we can say that metallic oxides are basic in nature.
AnswerAlmost all metals combine with oxygen to form metal oxides.
Metal + Oxygen → Metal oxide
For example, when copper is heated in air, it combines with oxygen
to form copper(II) oxide, a black oxide.
2Cu + O2
→ 2CuO
(Copper) (Copper(II) oxide)
Similarly, aluminium forms aluminium oxide.
4Al + 3O2 → 2Al2O3
(Aluminium) (Aluminium oxide)
Recall from Chapter 2, how copper oxide reacts with hydrochloric acid.
We have learnt that metal oxides are basic in nature. But some metal
oxides, such as aluminium oxide, zinc oxide show both acidic as well as
basic behaviour. Such metal oxides which react with both acids as well as
bases to produce salts and water are known as amphoteric oxides.
Aluminium oxide reacts in the following manner with acids and bases –
Al2O3
+ 6HCl → 2AlCl3
+ 3H2O
Al2O3
+ 2NaOH → 2NaAlO2
+ H2O
(Sodium
aluminate)
Most metal oxides are insoluble in wat
Explanation:
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