Question

A BROWN COLOUR METAL " X" TAKES PART IN COMBUSTION FORMS A BLAVK COLOUR OXIDE"Y"? WHEN HYDROGEN IS PASSED ABOVE THIS BLACKS COLOURED SUBSTANCE THEN ORGINALCOLOUR OF THE METAL IS REGAINED .

1. IDENTIFY THE METAL X AND Y?

2. WRITE DOWN THE TWO REACTIONS OCCURING?

3. NAME THE TYPES OF BOTH REACTION?

Answer 1

1. The brown metal is Copper (Cu) and oxide is copper oxide (CuO).

2. The reactions are as follows:

(a) Cu (s) + O₂ (g) → CuO (s)

Brown (X) Black (Y)

(b) CuO (s) + H₂ (g)→ Cu (s) + H₂O (l)

(Y) (X)

3. Reaction (a) is a combination reaction while reaction (b) is a redox reaction.