Irons,metals, And Redox Flashcards
What is the word equation for rusting
Iron + oxygen + water = hydrated iron (III) oxide (rust)
What are some examples of barrier methods in the prevention of rusting
Painting or coating with plastic
Oiling or greasing
Explain how sacrificial protection can be used to prevent rusting
Zinc is more reactive than iron so will be oxidised instead of the iron
A coating of zinc can be sprayed on the iron, this is known as galvanisation
Or big blocks of zinc can be bolted onto the iron, this is used on ships’ hulls, or underground iron pipes
What is oxidation
The gaining of oxygen
What is reduction
The losing of oxygen
What is the most common reaction to separate oxygen from a metal
Iron oxide + carbon = iron + carbon dioxide
Carbon is the reducing agent as it gets oxidised
What is a method of extraction for the more reactive metals and outline the method
Electrolysis, electricity is used to separate the metal from other elements in that compound
How is carbon used for extraction of metals
Metal is heated with carbon monoxide
The carbon displaces the oxygen from the iron oxide
