extraction of gold gcse
Extracting Metals Worksheet
1. The reactivity of a metal determines which method should be used to extract it from an ore. Place the metals lead, calcium, copper, zinc and aluminium into the reactivity series below. potassium sodium magnesium (carbon) iron (hydrogen) silver gold platinum 2. Which metal could be used to displace sodium from sodium chloride?
WhatsAppExamstyle Questions | Scool, the revision website
(1 mark) (Marks available: 4) Answer. Answer outline and marking scheme for question: 3. a) A = graphite electrodes. (1 mark) B = molten bauxite/aluminium ore. (1 mark) C = molten aluminium metal. (1 mark) b) To lower the melting point of the aluminium oxide (so less energy required).
Carbon in Metal Extraction Worksheet EdPlace
The picture shows extraction of iron ore in a mine. Carbon is used to extract metals from their ores. This method involves reduction. Reduction means gain of electrons and loss of oxygen (see diagram). Metals are usually found in nature in compounds called oxides; as the name suggests, the metal naturally forms a compound with oxygen. For example, iron is found as iron oxide.
Openpit mining Wikipedia
Openpit gold mining is one of the highest potential mining threats on the environment as it affects the air and water chemistry. The exposed dust may be toxic or radioactive, making it a health concern for the workers and the surrounding communities.
Gold, Chemical Element uses, elements, examples, metal ...
Overview. Large amounts of gold are still used in the manufacture of coins, medals, jewelry, and art. Gold also has a number of uses in industry, medicine, and other applications. For example, one radioactive isotope of gold is commonly used to treat cancer. SYMBOL Au...
Precious metals and mining in the New World: 1500–1800 ...
Precious metals and mining in the New World: 1500–1800. These two precious metals together with copper were regarded as the standard and measure of value in all societies throughout history. The sudden increase in the supply of gold and silver greatly increased the capacity of individual countries such as Spain and Portugal to finance wars...
GCSE Chemistry – Extraction of Metals –
Extracting metals. Ores contain enough metal to make it economical to be extracted. The economics of extraction can change over time. Ores are mined and may be concentrated before they are extracted and purified. Unreactive metals such as gold are found in the Earth itself.
Extraction Process of Aluminium from Bauxite Ore
Extraction Process of Aluminium from Bauxite Ore. The separation of the alumina from the impurities in the bauxite ore is usually accomplished by the Bayer Process. In this process the ground bauxite is leached with caustic soda (NaOH) to produce soluble sodium aluminate (NaAlO2), leaving the impurities in the insoluble residue.
Mr Morton Qatar Science
Metal Date of discovery Main source Main extraction method Gold Known to ancient civilisations In the Earth as the metal itself Physically separating it from the rocks it is mixed with Zinc 1500 Zinc carbonate Reduction by carbon Sodium 1807 Sodium chloride Electrolysis (a) Explain why gold is found mainly as the metal itself in the Earth.
Reduction of Metal Oxides by Carbon
The extraction of metals from ores can cause environmental problems. These include global warming, as a result of the carbon dioxide gas produced, and scars on the landscape from quarrying and mining ores.
Displacement reactions between metals and their salts ...
GCSE. AQA Chemistry. Chemical changes. Reactivity of metals. Extraction of metals and reduction. Reduction involves the loss of oxygen. Identify the substances which are oxidised or reduced in terms of gain or loss of oxygen. The reactivity series. A more reactive metal can displace a less reactive metal from a compound.
Basics of an open pit mine
Open pit mines can be used in coal mining, and they are used extensively in "hard rock" mining for ores such as metal ores, copper, gold, iron, aluminum, and many minerals. In a open pit coal mine, the pit bottom would be the bottom mined coal seam elevation, since it is usually feasible to extract multiple seams when surface mining coal.
Salt Mining | HowStuffWorks
Salt is generally produced one of three ways: deepshaft mining, solution mining or solar evaporation. Deepshaft mining is much like mining for any other mineral. Typically, the salt exists as deposits in ancient underground seabeds, which became buried through tectonic changes over thousands of years.
Goldmining in Peru: forests razed, millions lost, s ...
May 01, 2016· Goldmining in Peru: forests razed, millions lost, s auctioned. These include the destruction of forests and riverbanks, contamination of rivers by mercury and cyanide, contamination of people, fish and other foods by mercury, indications of forced labour, 10,000s of child workers, prostitution, ual exploitation of minors,...
What is Bioleaching? (with pictures)
Oct 01, 2019· Bioleaching is the use of bacterial microorganisms to extract precious metals, such as gold, from ore in which it is embedded. As an alternative to smelting or roasting, miners use bioleaching when there are lower concentrations of metal in ore and they need an efficient, environmentally responsible method to extract it.
Gold Mining Has Devastated The Peruvian Amazon – ThinkProgress
May 31, 2016· Most miners in Madre de Dios use liquid mercury to extract gold from soils they explore with suction hoses, and during the purifying process, the mercury is burned off and at best recovered in ...
Extracting Metals by Electrolysis
The reactivity series and metal extraction The reactivity of a metal determines how it is extracted. Metals above carbon in the reactivity series must be extracted using electrolysis. Metals less reactive than carbon can be extracted from their ores by reduction. Copper, silver, gold and platinum can occur in their pure form (natively) and do not