Metals and Electrochemistry Flashcards
What two metals rust?
Iron and Steel
How quickly does potassium corrode?
In seconds
How quickly does copper corrode
In years
How quickly does gold corrode?
Gold never corrodes
What two things are ESSENTIAL for corrosion/ rusting
- water
*oxygen
What two things speed up corrosion/ rust but don’t cause it?
Acid
Salt
What are the cheap ways to protect metal?
Painting and Oil&Grease
What are the expensive ways to protect metal?
Electroplating and Galvasing
What is electroplating?
Electroplating is when you coat reactive metals in less reactive metals.
some properties of Gold.
- Its shiny
- It is unreactive
- It is ductile
- It is malleable
- It is a good conductor of heat + electricity
where can gold be found?
the earth and rivers, this is because it is so unreactive
what is an ore?
an ore is a compound from which a metal can be extracted
the alkali metals are very
reactive
Does calcium react with water?
yes
metal + water =
metal hydroxide + hydrogen
What do metals produce when reacted with acid?
salt + hydrogen
magnesium + hydrochloric acid ->
magnesium chloride + hydrogen
What do metals produce when reacted with oxygen?
metal oxide
what metal is at the top of the reactivity series
potassium
what is the second metal on the reactivity series
sodium
what is the third metal on the reactivity series
lithium
what is the fourth metal on the reactivity series
calcium
what is the 5th metal on the reactivity series
magnesium
what is the 6th metal on the reactivity series
aluminium
