Question

An element 'X' burns with a dazzling white flame and changes into white powder 'Y'. Identify 'X' and 'Y'.

Answer 1

Explanation:

metal x is magnesium and y is magnesium oxide which on reacting with oxygen produces a white powder

1. 2Mg + o2 ------ 2Mgo

Answer 2

Answer:

The element X is Magnesium.

Explanation:

• When magnesium is burned, it reacts with oxygen in the air and gives out a bright white flame. The salt formed is magnesium oxide which is white in color.
• $2Mg + O_{2}$ → $2MgO$
• Magnesium loses two electrons and oxygen accepts these two electrons. This forms an ionic compound.
• Two moles of magnesium atoms react with one mole of oxygen molecules to give two moles of magnesium oxide.
• This reaction is exothermic as new bonds are formed.