Flashcards
mock-metals
Flashcards do conjunto (29)
- 1what does metallic bonding occur in-metallic elements such as iron and copper
-alloys such as stainless steal - 2what is the structure of metals likemetals have a giant structure in which electrons in the outer shell are delocalised(not bound to one atom)This produces a regular arrangement(lattice)of positive ions held together by electrostatic attraction to the delocalised electrons
- 3what is a metallic bonda metallic bond is the attraction between the positive ions and the delocalised negatively charged electrons
- 4how do metals properties and structure make them usefulh
- 5what are the particles in a pure metal like-the particles in a pure metal have a regular arrangement. The layers are able to slide over each other quite easily which means the metals can be bent and shaped
- 6why is copper traditionally used to make water pipes-it is an unreactive metal so it does not react with water
-it can be easily shaped - 7what are the uses and properties of aluminium, copper and gold
- 8what are alloysmost metal objects are made from alloys-mixtures that contain a metal and at least one other element
- 9why cant pure metals be used for most thingsthey are to soft
- 10in alloys why do the layers not slide over each otherthe added element disturbs the regular arrangement of the metal atoms so the layers do not slide over each other so easily. This means alloys are usually harder and stronger than pure metals
- 11what is steelsteel is a very useful alloy made from iron
- 12what is reduced in a blast furnace to produce ironiron oxide
- 13how much iron does molten iron obtained from a blast furnace contain96% and 4% inpurities including carbon,phosphorus,silica
- 14whats the problem with this impure ironit is very brittle and has limited uses
- 15what are the atoms in pure iron like (arrangement)the atoms in pure iron are arranged in layers that can slide over each other easily, making it soft and malleable
- 16why is pure iron not so goodit can be easily shaped but is to soft for many practical uses
- 17how can the properties of iron be changedthey can be changed by mixing it with small quantities of carbon or other metals to make steel....the majority of iron is converted into steel
- 18why are alloys developedalloys are developed to have the required properties for a specific purpose
- 19in steel the amount of carbon or other elements determines its properties. Give examples of this-steel with a high carbon content is hard and strong
-steel with a low carbon content is soft and easily shaped
-stainless steel contains chromium and nickel and is hard and resistant to corrosion - 20list 3 metals that are to soft for many uses-pure copper,gold and aluminium
- - 21how are these metals changed to make them useablethey are mixed with small amounts of similar metals to make them harder for items in everyday use e.g coins
- 22what is gold mixed with to form an alloygold is mixed with silver, copper and zinc to form an alloy
- 23what is 24 carat gold100% gold
- 24what is 18 carat gold18/24*100 = 75%
- 25aluminium alloys combine low density ans high strength. What are they used forto make aeroplanes
- 26what is bronze an alloy ofcopper and tin
- 27what is bronze used forit has a bright colour and is used to make statues and decorative objects
- 28what is brass an alloy ofcopper and zinc
- 29what are the properties of brass and what is it used forit is hard-wearing and very resistant to corrosion
it is used to make water taps and door fittings
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- GCSE chemistry new FlashCards sobre mock-metals, criado por ella stokes em 22-11-2017.
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- ella stokes
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