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2b) Group 1 elements - lithium, sodium and potassium (What happens when…
2b) Group 1 elements - lithium, sodium and potassium
Common Name
ALKALI METALS
What happens when you add them to water
Lithium
Movement
shiny when cut
reacts with water
effervescence (bubbles)
a bit of smoke
Sodium
More Movement
shiny when cut
reacts with water
more effervescence (bubbles)
more smoke
Potassium
loads of Movement
Lilac flame
reacts with water
LOADS of effervescence (bubbles)
MORE smoke
more reactive the further you go down the group
the Universal Indicator changed colour from green(neutral) to Blue/purple(alkali) in the solution.
Flame tests
Lithium (Red)
Sodium (Orange)
Potassium (Lilac)
Calcium (Brick Red)
colours of indicators in alkali solution
UI = purple/blue
Red Litmus = blue
methyl orange = yellow
pattern in reactivity
as you move down the group the elements become more reactive