Question

When hydrogen is passed over copper​ oxide , copper and steam are formed . Write a balanced equation for this reaction and state which of the chemicals are : elements, compounds, reactants, products, metals, nonmetals.

Answer 1

CuO + H2-----> Cu +H2O

Elements: Cu ( Copper) , H ( Hydrogen)
Compounds: CuO ( Copper Oxide) , H2O ( Water\Steam)
Reactants: Cuo and H2
Products: Cu and H2O
Metals: Cu ( Copper)
Non-Metals: H (Hydrogen)

Answer 2

Answer: $CuO+H_2\rightarrow Cu+H_2O$

Explanation:

$CuO+H_2\rightarrow Cu+H_2O$

On reactant side:

$CuO$ : Compound and $H_2$: element

Oxidation state of copper = +2

Oxidation state of hydrogen = 0

On product side:

$Cu$ : element and metal and $H_2O$: compound

Oxidation state of copper = 0

Oxidation state of hydrogen = +2

The oxidation state of copper reduces from +2 to 0, it is getting reduced. Thus, it undergoes reduction reaction. The oxidation state of hydrogen increases from 0 to +2. Thus, it is getting oxidized and it undergoes oxidation reaction.  Thus, it is considered as redox reaction.

Element is a pure substance which is composed of similar atoms.

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.