Question

Give reasons 1)copper utensils and sheets become blackish after some days

Answer 1

Copper utensils become blackish after some days due to tarnishing caused by the reaction of copper with oxygen and sulfur compounds in the air.

Step-by-step explanation:

Copper utensils and sheets become blackish after some days due to a process called tarnishing. Tarnishing occurs when copper reacts with substances in the air, such as oxygen and sulfur compounds. Over time, a layer of copper oxide and copper sulfide forms on the surface of the copper, giving it a blackish color.

Answer 2

Copper reacts with the oxygen in the air and this is known as oxidation and is a chemical change . The copper reacts with oxygen and gets oxidised to form a blackish coating on the sheet. Cu+O2->CuO..
This is a combination reaction. #answerwithquality #BAL