Redox, Oxidation And Reduction Reactions Flashcards
What do low pH numbers mean?
These are light colours, it means a solution is acidic.
What do high pH numbers mean?
These are darker colours, this means a solution is alkaline.
What does a pH of 7 mean?
This is green and means a solution is neutral
How is Oxygen obtained?
By the fractional distillation of liquid air or in smaller quantities via chemical methods
What is corrosion?
The formation of a metal compound on the surface of a metal.
What is rusting?
The corrosion of Iron and Steel.
What is sacrificial protection?
Attaching Iron to a more reactive metal.
What is the disadvantage of sacrificial protection?
It stops working when the more reactive metal gets used up.
What are the sacrificial metals used?
Magnesium or Zinc
What two things are needed for rusting?
Water and Oxygen
What is physical barrier protection?
When a coating is put on Iron or Steel, which stops rusting as the coating keeps our air and water
What are the types of Physical barriers?
Paint, plastic, oil, grease, tin, other less reactive metals.
What is the disadvantage of physical barrier protection?
It stops working if the coating is scratched or damaged.
What is galvanising?
Coating Iron with zinc.
What is rust?
Hydrated Iron Oxide
