Question

What kind of change is observed when copper utensil appear to be greenish in colour WHAT NEW SUBSTANCE IS FORMED?WHAT IS THE SUBSTANCES THAT IS FORMED'S NAME

Answer 1

it is called chemical reaction..... the substance formed is known as copper oxide...as it reacts with oxygen

Answer 2

Answer:

• When a copper utensil is exposed to air or comes in contact with the same, a reaction takes place between copper,and gases and moisture present in the air which results in the formation of a mixture of copper compounds which imparts a green colour to the surface of the metal.
• Copper oxide then combines with carbon dioxide to make copper carbonate, which gives it a green colour. This process is called corrosion of copper.
• The green material is a mixture of copper hydroxide (Cu(OH)2) and copper carbonate (CuCO3). Copper(II) carbonate is a blue-green compound.

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