Extraction of Metals: Finding, Heating with Carbon, and Electrolysis

The video tutorial covers methods of extracting metals from ores, focusing on two main techniques: heating with carbon and electrolysis. It explains how metals are found in nature, either as uncombined elements or in compounds, and discusses the reactivity series, which influences the extraction method. The video details the smelting process using carbon for less reactive metals and electrolysis for more reactive metals, highlighting the advantages and disadvantages of each method.

How are unreactive metals like gold and silver typically found in nature?

• As compounds with other elements

• As uncombined metals

• As metal oxides

• As metal sulfides

What is the process called when metal oxides are reduced to metals by heating with carbon?

• Electrolysis

• Smelting

• Refining

• Oxidation

Which of the following is a disadvantage of using carbon for metal extraction?

• It requires low-quality ores

• It is very expensive

• It produces a lot of carbon dioxide

• It can only be used for metals more reactive than carbon

What is the main advantage of using electrolysis for metal extraction?

• It is energy-efficient

• It is environmentally friendly

• It produces metals with high purity

• It can be used for metals less reactive than carbon

Why is electrolysis considered an expensive method for metal extraction?

• It uses cheap feedstock

• It is only suitable for small-scale operations

• It requires a lot of energy to melt the ore

• It produces low-purity metals

Which metals cannot be extracted using carbon and require electrolysis?

• Potassium and sodium

• Copper and lead

• Iron and zinc

• Gold and silver

What determines the choice of extraction method for a metal?

• The melting point of the metal

• The weight of the metal

• The reactivity of the metal

• The color of the metal