3.5.6 - Metal Extraction Flashcards
What is an ore !?
. Rocks containing specific metal compounds are called ores
. Most metals are found in the earths crust as compounds with oxygen and sulphur. This is because over a long time those metals have reacted with oxygen and sulphur.
An example of an ore !?
. Cu
. Pb
. Fe
. Zn
. Al
. Mg
. Ca
. Li
. Na
. K
What is a native !?
. Natives are metals which are too unreactive to have combined with oxygen or sulphur. They are found native, which means chemically uncombined.
Why don’t native metals need to be chemically extracted
. They all ready exist on their own
What are the two ways in which an ore can be chemically extracted!?
- Using electricity
- Carbon extraction
Why would you chemically extract an ore using electricity !?
. metals more reactive than carbon cannot be displaced by carbon. Instead we have to use electricity to break down their ore compound
(aluminium is extracted from its ore in this way)
Why would you chemically extract an ore by using carbon extraction !?
Metals less reactive than carbon can be displaced by carbon
(*for example, copper can be displaced from its ore copper oxide by heating with carbon *).
What kind of reaction is using carbon to displace metal from its oxide called !?
. Redox reaction
What is the definition of reduction (in terms of oxygen) !?
. Loss of oxygen
What is the definition of reducing agent (in terms of oxygen) !?
. Takes oxygen away from something else
What is the definition of oxidation (in terms of oxygen) !?
. Gain of oxygen
What is the definition of oxidising agent (in terms of oxygen) !?
. Gives oxygen to something else
What is the definition of redox (in terms of oxygen) !?
. Reduction and oxidation in the same reaction
