Chemical Reactions Flashcards
(24 cards)
Metals react with oxygen to form…?
Metal oxides
Name a metal that will burn in oxygen
- Sodium
- Magnesium
- Aluminium
Name a metal that will slowly tarnish but does not burn.
Silver
Name a metal that doesn’t react with oxygen
Gold
Oxidation is when oxygen is…?
Gained
Reduction is when oxygen is…?
Removed
When reduction and oxidation are occurring together, it is called…?
Redox
What gas is released when metals react with water?
Hydrogen
Why is gold usually found as a pure metal in the Earths crust?
Because they are unreactive
How are most metals found in the Earths crust?
As metal oxides in rocks known as ores
What is ‘Slag’
Bits of unwanted rock
Name 2 reasons why Carbon is used to extract iron from iron oxide.
1) It is more reactive than iron but not dangerously reactive
2) It is readily available
3) it is Cheap!
Alkalis are metal hydroxides that………in water.
Dissolve
Finish the equation:
Hydrochloric Acid + Potassium hydroxide –>
Potassium chloride + Water
Bases usually refer to insoluble compounds that can neutralise an acid. Most metal ______ and insoluble __________ are based.
1) Oxides
2) Hydroxides
Finish the equation:
Copper oxide + sulphuric acid —>
Copper sulfate + water
Name 2 examples of salts
1) sodium Chloride
2) Magnesium Nitrate
3) Zinc Sulfate
Hydrochloric acid gives a
Chloride ending
Sulphuric acid gives a
Sulfate ending
Nitric acid gives a
Nitrate ending
Metal carbonates can be used to neutralise acids, to produce a ____, _____ and ______ _______ gas
1) Salt
2) Water
3) Carbon Dioxide
What is the range of PH for Acids
0-6
What is the range of PH for Alkalis
8-14
What PH is neutral
7
