BMS – Yr8 Earth – Earth Resources C Aluminium is used to make many items. Aluminium is extracted from aluminium ore. Aluminium ore is called bauxite, which is impure aluminium oxide. The flow chart shows the main steps in the extraction of aluminium from aluminium ore. Most aluminium is recycled. Aluminium is recycled by melting scrap aluminium at 700 °C. Use your own knowledge ...
Chemguide – questions EXTRACTION OF METALS: ALUMINIUM 1. If your syllabus doesn't expect you to be able to describe the extraction of aluminium oxide from bauxite, then ignore this question. a) The bauxite is treated with moderately concentrated sodium hydroxide at temperatures of between 140 and 240°C, and pressures of up to 35 atmospheres. Why does the pressure have to be so high ...
Chemguide – answers EXTRACTION OF METALS: ALUMINIUM 1. a) At ordinary pressures the sodium hydroxide solution would boil at a temperature of a bit more than 100°C (dissolving something in water increases its boiling point a bit). The increased pressure keeps the sodium hydroxide solution liquid at the higher temperature needed. b) Al O + 2NaOH + 3H O 2NaAl(OH) 2 3 2 4 ...
Title: Extraction of metals and reduction Date: Enter the room in silence. Put your planner, pencil case, exercise book and any other equipment you will need on your desk. Place your bags in the cupboards. identify substances reduced by loss of oxygen Prior knowledge: explain how extraction methods depend on metal reactivity interpret or evaluate information on specific metal extraction processes. Extraction, oxidation, reduction Activate- ...
AS-Level ELECTRO-CHEMISTRY Section A Q1 In the extraction of aluminium by electrolysis, why is it necessary to dissolve aluminium oxide in molten cryolite? A to reduce the very high melting point of the electrolyte B cryolite provides the ions needed to carry the current C cryolite reacts with the aluminium oxide to form ions D molten aluminium oxide alone would not conduct electricity Q2 A ...
Digitalteachers.co.ug O-level chemistry General principles of extraction of metals Occurrence of elements in nature Elements occur in two state 1. Native or free especially less reactive, Au, Ag, Cu, Pt. 2. Combined state: generally, the reactive metals occur as oxides, sulphide, phosphates, silicates, carbonates, phosphates, chlorides and nitrates Minerals and ores Minerals are compound of metals which are found in the earth and ...
20 Do not write outside the 0 6 This question is about the extraction of aluminium. box 0 6 . 1 An aluminium atom is represented as: 27 Al 13 Give the number of electrons and neutrons in the aluminium atom. [2 marks] ...
Topic 2.7 EXTRACTION OF METALS Extraction of Iron Extraction of Aluminium Extraction of Titanium Recycling EXTRACTING METALS FROM THEIR ORES Most metals do not occur native. They exist in compounds, usually oxides or sulphides. These compounds are known as minerals. A rock which contains this mineral is called an ore. A number of methods are used to extract metals from their ores. The best ...
Metal extraction Converting sulphides to oxides The occurrence of metals in the Earth's crust Sulphides ores are usually converted to oxides before •Rocks that contain a high enough percentage of a extraction by roasting with oxygen. metal to be extracted commercially are known as The most important ore of zinc is mostly zinc sulphide ores . 2 ZnS + 3O 2ZnO + 2SO &bull ...
Chemguide – answers EXTRACTION OF METALS: INTRODUCTION 1. A mineral is a pure naturally-occurring compound of the metal or other element you are interested in. An ore contains one or more minerals, and probably other rocky material, from which you can economically extract the metal you want. 2. The ore is crushed and treated with something which bonds to the particles of the metal compound ...
Extraction methods of iron and aluminium Extracting iron from iron ore using a blast furnace Iron is extracted from iron ore using carbon and limestone inside a blast furnace. Iron ores are present as iron oxides in rocks like magnetite and haematite. These are mined from the ground in massive open cast mines in the USA, Canada, Brazil, Australia, China, Russia and Sweden. The iron ...
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