Metals And Re-Activity Flashcards
Where are the alkaline metals on the periodic table and what are they known for
Group 1 left side know for being very re-active
What’s are the properties of alkaline metals
They are soft and can be cut by a knife
They have low density
They conduct electricity very well
They are shiny when freshly cut
How do alkaline metals react with oxygen
They re-act with oxygen to form metal oxides
Why are the alkaline metals so re active
They are in group one the they have one electron on their outermost shell so to stablalise the atom they must loose that electron so they are re active but the further down the group you for that last electron gets lost easier
What’s the reactivity series order
Potassium Sodium Calcium Magnesium Aluminium Carbon Zinc Iron Lead Hydrogen Copper Silver Gold
What is rusting
The corrosion of iron
What makes iron rust
The presence of oxygen and water
What are methods of preventing rust
USING BARRIERS - Painting, plastic coating, covering in grease/oil.
ALLOYING - mixing iron with chromium or nickel to produce stainless steel preventing rust
ADDING A SACRIFICIAL LAYER - galvanised iron is coated with a layer of zinc this provides a barrier
What are the methods of extraction
Above carbon - electrolysis
Below carbon - Blast furnace
Low reactivity metals ( silver, gold, platinum) - don’t need to be extracted for they are so un re active you will find them n their own
Why do most metals need to be extracted
Because they Coe in metal ores and to just get the pure metal you need to extract it from the ore.
What are metal ores
They are rocks where metal can be found
What are active metals
They are the un reactive metals that can be found as elements. (Gold, silver, platinum)
What method is used for extracting aluminium
Electrolysis
What method is used to extract iron
A blast furnace
What method is used to extract gold
No method is used they can be fond as a pure element
