metal from ores Flashcards
are reactive metals found as ores or elements
ores- found joined together with other elements usually oxygen or sulphur
examples of metals found as ores
tin,lead, iron, zinc
are unreactive metals found as elements or ores
elements
examples of metals found as elements
silver, gold
in a metal ore the metal is present as an (atom/ion)
ion
how does an ion become an atom
the metal must gain electrons (the metal ions must be reduced)
what is the process of extracting metals from their ores
reduction
what elements are extracted from ores by electrosis (page 10 data book)
zinc+aluminium ⬆️
what metals can be extracted from their ore by heating with carbon or carbon dioxed (page 10 data book)
copper⬆️zinc
what metals can be reduced from their ores with heat alone (page 10 data book)
silver ⬇️
are more reactive metals easier or harder to extract from ores
more difficult
carbon and carbon monoxide are used as a
reducing agent
the reducing agent will always be a chemical which
reacts with the metal oxide
what is electrosis
the proccess where elctricity is passed through an ionic compound which is molten or in an aqueous solution. the ionic compound is decomposed (broken down)
in electrosis the ions have to be
free to move
the positive ions are attracted to the
negative electrode
in electrosis the ……. always gets reduced
metal
why is d.c. currebt used in elctrosis
the current flows in one direction
why is copper formed at the negative electrode
it is a metal so is postive
opposites attract
defintion-electrolyte
a compound which conducts electricity due to movement of ions when in solution or molten
how must electrolytes be bonded and why
must be ionic and soluble
should electrolytes be reactive or unreactive
unreactive
to produce a voltage the metals in an electrochemical cell must be
different
elctrons always flow around the circuit from the metal ……. in the electrochemical series to the metal …… in the electrochemical series
higher to lower
if the metals are further apart they create a
larger voltage
at what electrode does oxidation happen in electrochemical cells
at the electrode which has the chemical highest in the series
at what electrode does reduction happen
reduction always happens at the elctrode with the chemical lowest on the series
what is a salt bridge and what does it do
It contains an ionic solution (electrolyte).
It allows IONS to flow from one beaker
to the other.
It completes the electrical circuit.
It must not react with the chemical in the beakers
Insoluble substances and covalent
