Chemical Change - C5
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What does OILRIG stand for
Oxidation is loss Reduction is gain
What groups are very reactive
1,2 and 3
Name some metals which are unreactive
Gold, copper, silver and platimun
Name some methods of metal extraction
Smelting -carbon Leaching Phytomining Electrolysis
How to prepare salts
From acid + metal - use excess metal From acid + base - use excess base From acid + alkali - use indicator
What is an alkali
A soluble base
What is a base
A substance that reacts with an acid and neutralies it
What is a salt
It is a compound formed when the hydrogen in acid is replaced by a metal
What do acids produce when placed in water
H+ ions
what do alkalis produce when placed in water
OH- ions
What happens when the pH decreases by 1
the hydrogen ion concentration increases by a factor of 10