Redox Reactions Flashcards
1
Q
What is a redox reaction
A
One in which oxidisation and reduction occur at the same time
2
Q
How can a reaction be considered oxidised
A
Gain of oxygen
Loss of hydrogen
Loss of electrons
3
Q
How can a reaction be considered a reduction
A
Loss of oxygen
Gain of hydrogen
Gain of electrons
4
Q
Define rust
A
Rust is hydrated iron(iii) oxide, sometimes written as Fe₂O₃·nH₂O.
5
Q
How can rusting be prevented?
A
Using a protective barrier or layer- paint, oil, plastic coating, chromium
Sacrificial protection- putting a more reactive metal over iron or steel eg magnesium on sides of ships
Alloying- alloy is a mixture of two or more elements
6
Q
How is iron extracted
A
See textbook page 124
