1.8 Flashcards
Carbon is stored where?
What is it released as?
Fossil fuels
Released as carbon dioxide when burnt
Carbon dioxide is removed from the environment by what?
Green plants and algae for photosynthesis
What is carbon from co2 used to make?
2
Carbohydrates
Fats/proteins
Which make up the body of plants and algae
What happens when green plants and algae are eaten by animals?
Some of the carbon becomes part of the fats and proteins that make up their bodies
What happens when plants,algae and animals die?
Some animals and microorganisms feed on their remains and release carbon dioxide into the atmosphere when they respire
The carbon cycle
The process through which carbon is cycled through the air ground plants animals and fossil fuels
How limestone (calcium carbonate) is formed from carbon dioxide dissolved in water
over long time carbon is removed from seawater when shells and bones of marine animals and plankton collect on sea floor.
These are made of limestone and contain carbon
what is carbon?
all organic molecules and is the major element within our bodies
what happens when green plants algae and animals respire?
some of this carbon becomes carbon dioxide and is released into atmosphere
what happens when shells and bones deposited on sea floor?
carbon is removed from the rest of the carbon cycle for some amount of time
what does the amount of limestone deposited in the ocean depend on?
why?
the amount of warm tropical shallow oceans on the planet
because this is where limestone producing such as corals live
human interference in carbon cycle
destruction of rainforests and other forms of vegetation without replanting
where is carbon stored / released as
in fossil fuels
as carbon dioxide when burnt
human interference in the natural carbon cycle
destruction of rainforests and other forms of vegetation without replanting
why is iron reacted with carbon?
because carbon is more reactive than iron
also cheap
when extracted, what does the more reactive element do?
removes the oxygen
what happens when iron oxide and carbon is heated?
oxygen is removed from iron
what is it called when we remove oxygen from an element?
What is this carried out by in the case of lead?
reduction
carbon
process of iron oxide being mixed with carbon
what is it heated in?
blast furnace
what does a blast funace do?
produces iron
what is coke?
carbon
iron oxide formula
Fe2O3
the coke burns to produce what?
carbon dioxide
the carbon dioxide reacts with coke to produce what?
carbon monoxide C+CO2 —> 2CO
how is iron produced?
iron oxide reacts with carbon monoxide
what is reduced / oxidised? (iron)
iron oxide - reduced
carbon monoxide- oxidised
Fe2O3 + 3CO —> 2Fe + 3CO2
what is a reducing agent in the extraction of lead
carbon and carbon monoxide
