Fichas
6. Metals
Fichas del conjunto (38)
- 1How can metals be arranged?In order of their reactivity from their reactions with water and dilute acids
- 2What do displacement reactions involve?Metals and their compounds in aqueous solution establishing positions within the reactivity series
- 3How can copper be obtained?From solutions of copper salts by displacement using scrap iron
- 4Where are unreactive metals found?In the earth as the metal its self
- 5Where are most metals found?As a compound in the earth, these require chemical reactions to extract the metal
- 6How are metals that are less reactive than carbon be extracted from their oxides?By reduction with carbon
- 7What is reduction of carbon?The removal of oxygen
- 8What is the word equation for the extraction of iron from its ore?iron oxide + carbon → iron + carbon dioxide
- 9What is the symbol equation for the extraction of iron from its ore?2Fe2O3 + 3C → 4Fe + 3CO2
- 10How are metals that are more reactive than carbon extracted?They are extracted by electrolysis of molten compounds
- 11Why is it harder to extract metals by electrolysis?Electrolysis involves the uses of large amounts of energy in the extraction and so it is very expensive
- 12How is copper extracted?From copper-rich ores by heating the ores in a furnace (smelting)
- 13How is copper purified?By electrolysis
- 14What is phytomining?Using plants to absorb metal compounds and then burning the plants to produce ash that contain the metal compounds
- 15What is bioleaching?Using bacteria to produce a leachate solution that contains the metal compound
- 16What happens at the negative electrode in the extraction of aluminium?Al3+ + 3e- → Al
- 17What happens at the positive electrode in the extraction of aluminium2O2- → O2 + 4e-
- 18What happens at the negative electrode in the purification of copper?Cu2+ + 2e- → Cu
- 19What happens at the positive electrode in the purification of copper?Cu → Cu2++ 2e-
- 20How can copper be extracted from solutions of cooper salts using scrap iron?Iron is more reactive than copper, so it can displace copper from copper salts. For example:
iron + copper sulfate → iron sulfate + copper - 21Why should we recycle metals?Because extracting them uses limited resources, and is expensive in terms of energy and in terms of effects on the environment
- 22What do metals consist of?Giant structures of atoms arranged in a regular pattern
- 23Why are metals conductive?Because of the delocalised electrons in their structures
- 24What does conduction depend of?The ability of electrons to move throughout the metal
- 25What are the layers of atoms able to do in metals?Slide over each other, this means that metals can be bent and shaped
- 26What are alloys made of?Usually two or more metals
- 27Why are alloys useful?Alloys are harder than pure metals because the different sizes of atoms in the metals distort the layers in the structure, making it more difficult for them to slide over each other
- 28What are the elements in the central bock of the periodic table known as?The transition metals
- 29What are transition metals useful for?They are useful as structural materials and for making things that must allow heat or electricity to pass through them easily (e.g. pans)
- 30How much iron does iron from the blast furnace contain?96%
- 31Why does iron from the blast furnace have limited uses?The impurities make it brittle and so it has limited uses
- 32What is most iron converted into?Steel
- 33What are steels?Alloys since they are mixtures of iron with carbon
- 34What are low-carbon steels like?They are easily shaped
- 35What are high-carbon steels like?They are hard
- 36What is stainless steel like?Resistant to corrosion
- 37What is copper useful for?Electrical wiring and plumbing
- 38What properties does copper have?It is a good conductor, it can be bent, but is hard enough to be used to make pipes or tanks and it does not react with water
Información
- Descripción
- GCSE Chemistry Fichas sobre 6. Metals, creado por Grace Isaac el 11/05/2016.
- Creado por
- Grace Isaac · may 2016
- Actualizado
- 6 abr 2018
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- 5
- Valoración
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