C1.3 - Metals and their Uses
- Created by: alishamunson
- Created on: 15-03-17 09:53
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- C1.3 - Metals and their Uses
- 3.1
- Metals are usually found in the Earth's crust.
- they are often combined chemically with other elements such as oxygen.
- An ore contains enough metal to make it worth extracting the metal.
- The method we use to extract a metal depends on its reactivity.
- Unreactive metals are found in the Earth as the metal.
- The oxides of metals less reactive than carbon can be reduced using carbon.
- Metals are usually found in the Earth's crust.
- 3.2
- Iron oxide is reduced in a blast furnace to make iron/
- Iron from the blast furnace is too brittle for many uses.
- Most iron is converted into alloys called steels.
- Steels contain carefully controlled quantities of carbon and other elements.
- 3.3
- Aluminium and titanium resist corrosion.
- They also have low densities compared with other strong metals.
- Aluminium and titanium cannot be extracted from their oxides using carbon.
- Aluminium and are expensive because extracting them involves many stages and requires large amounts of energy.
- Aluminium and titanium resist corrosion.
- 3.4
- Most copper is extracted from copper-rich ores by smelting.
- Copper can be purified by electrolysis.
- Bioleaching and phytomining are new ways to extract copper from low-grade ores.
- Copper can be obtained from solutions of copper salts by displacement or electrolysis.
- 3.5
- The transition metals are found in the central block of the periodic table.
- Transition metals have properties that make them useful for building and making things.
- Most of the metals we use are alloys.
- 3.6
- There are social, economic and environmental issues associated with exploiting metal ores.
- Recycling saves energy and limited resources.
- There are drawbacks as well as benefits from the use of metals in structures.
- 3.1
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