Extraction and Properties of Copper

Flashcards based on the extraction methods, properties, and reactions of copper and its compounds.

What defines heavy metals in terms of density and atomic weight?

Heavy metals are naturally occurring elements that have a high atomic weight and a density at least 5 times greater than that of water.

Where can copper be found in its native state?

Copper is found in native state in Canada, Mexico, Russia, Chile, Zambia, USA, and China.

What is the molecular formula of copper pyrites?

CuFeS2.

What is the Froth Floatation Process used for?

It is used for concentrating the sulphide ores by removing gangue particles from ore.

What happens to copper during roasting?

The concentrated ore is heated in air and impurities like arsenic and antimony are removed as volatile oxides.

What is copper matte?

Copper matte is a mixture of copper(I) sulphide and iron(II) sulphide.

What process is used to refine blister copper?

Blister copper is purified by furnace refining and electro-refining.

What products are formed when copper reacts with moist air?

Copper reacts with moist air to form green basic carbonate, CuCO3.Cu(OH)2.

What happens when copper is exposed to concentrated HNO3?

Copper reacts to produce gases like N2, NO2, NO, and N2O.

What is blue vitriol?

Blue vitriol is pentahydrate copper sulphate, CuSO4.5H2O.

Describe the action of heat on blue vitriol. What are the resulting products?

When blue vitriol is heated, it effloresces to a pale blue powder (CuSO4.3H2O) and further heating leads to anhydrous CuSO4.